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Cited by 1Thermal Radiation and Cooling TechnologiesCalibration and Measurement TechniquesRadiative Heat Transfer Studies

The DOI matches its Crossref record; 64 of the 66 references it cites were found in a registry or an index, and 2 are not checked yet; 3 of the 92 sources its claims cite were checked for support.

Thermal Radiation Testing Methods at Cryogenic Temperatures: A Review

Open access
Li, Bixi, Shen, Fuzhi·2026·Cryo
DOI 10.3390/cryo2010004
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Abstract

As one of the three fundamental modes of heat transfer, thermal radiation has long attracted interest due to its independence from a medium and its strong temperature dependence. In extreme environments such as deep space exploration and cryogenic engineering, thermal radiation often becomes the dominant heat transfer mechanism. Consequently, the radiative properties of materials are crucial for achieving precise thermal control, directly influencing the thermal stability and overall performance of advanced systems, including space probes, cryogenic devices, and superconducting components operating under high-vacuum and low-temperature conditions. This paper provides a systematic review of the physical mechanisms, key factors affecting emissivity, major measurement methods, and technological developments related to material radiative properties at cryogenic temperatures. Particular attention is given to experimental methods and techniques describing material radiative behavior, along with a comparative analysis of the suitability of different measurement techniques for cryogenic applications. Finally, the study highlights the significant practical value of this research for fields such as aerospace, precision electronics, and cryogenic instrumentation, aiming to offer insights for optimizing cryogenic thermal management and guiding the design of novel functional materials.

Verified 2026-11-10 · 2 references not checked yet

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

This review synthesizes thermal radiation testing methods at cryogenic temperatures, focusing on emissivity measurement by calorimetric, radiometric, and reflectance techniques. It compares experimental apparatuses, cooling approaches, materials, and temperature ranges, and outlines future needs in measurement technology, materials, and cryogenic applications.

Key findings

  • Thermal radiation becomes dominant in cryogenic high-vacuum conditions; emissivity depends on temperature, wavelength, direction, and surface microstructure. Kralik et al. found chemically polished pure aluminum (99.5% purity) had emissivity at 20 K less than one-quarter of its value at 320 K.
  • Direct methods—steady-state/dynamic calorimetry and radiometry—are favored for cryogenic emissivity, while reflectance methods are limited because cryogenic fluids can absorb, scatter, or phase-change with incident light and sealed cryogenic containers obstruct optical paths.
  • Calorimetric studies span very low temperatures: Anderson et al. measured below 6 K down to 0.2 K; Kralik et al. covered 30–140 K; Duckworth et al. measured silver-plated Cu at 25–35 K and found water-vapor contamination increased emissivity up to fourfold; Shen et al. covered 15.4–300 K; Dewasi et al. measured down to 82 K.
  • Radiometric studies include Hawks et al. at 5–100 K; Herve et al. at 20–200 K and 6–800 µm; Woods et al. at 80–300 K; Adibekyan et al. above 173 K and 4.5–20 µm; Hao et al. above 190 K and 1–1000 µm; Zhao et al. with a minimum of 9.2 K; and Yuan et al. at 213–423 K, 5–100 µm, and 0–75°.

Methods

  • Design: systematic review of physical mechanisms, factors affecting emissivity, major measurement methods, and technological developments for material radiative properties at cryogenic temperatures.
  • Data/sample: literature and experimental studies from 1968–2024, with Table 1 comparing direct-method devices by authors, method, materials, coolant, and sample temperature.
  • Analysis: qualitative comparative analysis of calorimetric, radiometric, and reflectance methods, including trends in cooling (liquid cryogens to cryocoolers), optical-path integration, background-noise management, and material systems.

Limitations

  • Stated: the discussion is limited to far-field and macroscopic thermal radiation; near-field effects and fluctuation electrodynamics are excluded.
  • Stated: reflectance methods face cryogenic challenges from cryogenic-fluid interactions with incident light and sealed containers obstructing optical paths; in situ testing remains mostly experimental and focused on macroscopic planar structures, with micro/nano-scale and heterogeneous surfaces still challenging.
  • Evident: as a review, it presents no new primary measurements or quantitative meta-analysis, and no formal limitations section is included.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.3390/cryo2010004

Cites

64 of 66 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Verification

Claims the paper makes

3 of 92 cited sources checked · 0 supported · 0 flagged · accuracy not yet measured

  • Premisecitation

    The utilization of emerging systems such as phase-change materials, two-dimensional materials (such as graphene, hexagonal boron nitride), and metamaterials facilitates dynamic regulation of material emissivity under external stimulant (such as temperature changes, electric field control) at cryogenic temperatures.

    “The utilization of emerging systems, such as phase-change materials, two-dimensional materials (such as graphene, hexagonal boron nitride), and metamaterials, facilitates dynamic regulation of material emissivity under external stimulant (such as temperature changes, electric field control) at cryogenic temperatures.”
    Quote in the paperNot a substantial claim2 of 3 sources checked
    • cites [62] Pirruccio, 2020, Near-Field Radiative Heat Transfer between High-Temperature Superconductors, Sci. Rep. source

      The Introduction (page unavailable) lists 2D materials, phase-change materials and hyperbolic materials in near-field heat-transfer research, and says heat transfer can be controlled by changing dielectric properties or applying an external magnetic field. It does not establish that all the listed systems dynamically regulate emissivity at cryogenic temperatures, or discuss hexagonal boron nitride or electric-field control. Its temperature-dependent example concerns superconducting films. (LLM, conf=0.85)

      Experimental — accuracy not yet measured
    • cites [63] Wei, 2021, Smart Materials for Dynamic Thermal Radiation Regulation, Small source
    • cites [64] Yu, 2024, Time-Modulated near-Field Radiative Heat Transfer, Proc. Natl. Acad. Sci. USA source

      The Discussion and Conclusion (page unavailable) says electro-optical time modulation can be used to regulate near-field radiative heat flow. It does not establish that the listed material classes dynamically regulate emissivity at cryogenic temperatures; it instead describes radiation sourced around ambient conditions. References to graphene, hBN, metamaterials, and phase-change materials do not establish that more specific claim. (LLM, conf=0.82)

      Experimental — accuracy not yet measured
  • Premisereasoning

    For most metallic materials, emissivity decreases with decreasing temperature.

    “For most metallic materials, emissivity decreases with decreasing temperature.”
    Quote in the paperNot a substantial claim
  • Premisereasoning

    For an opaque material, absorptance and reflectance are related by α + ρ = 1.

    “For an opaque material, where transmittance is zero, the principle of energy conservation dictates that absorptance (α) and reflectance (ρ) are related by the equation α + ρ = 1.”
    Quote in the paperSubstantial claim
  • Premisecitation

    Even for materials of identical composition, preparation methods and surface structure can lead to substantial variations in emissivity.

    “These results highlight that even for materials of identical composition, preparation methods and surface structure can lead to substantial variations in emissivity.”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [30] Frolec, 2019, A Database of Metallic Materials Emissivities and Absorptivities for Cryogenics, Cryogenics source
    • cites [31] Musilova, 2007, Effect of Different Treatments of Copper Surface on Its Total Hemispherical Absorptivity Bellow 77K, Cryogenics source
  • Premisecitation

    Tuttle et al. found that thinner, lighter BIRB coatings exhibited comparable or even superior emissivity relative to higher-density versions.

    “Furthermore, the team investigated BIRB coatings with varying areal densities and found that thinner, lighter coatings exhibited comparable or even superior emissivity relative to higher-density versions.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [16] Tuttle, 2012, A High-Resolution Measurement of the Low-Temperature Emissivity of Ball Infrared Black, AIP Conf. Proc. Am. Inst. Phys. source
  • Probably not a substantial claim. 30
  • It may state two separate claims as one. 25

  • Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

    Premisecitation

    The Herve et al. design accommodated up to five samples simultaneously and utilized an electric mechanism to enable multi-angle measurements.

    “The design accommodated up to five samples simultaneously and utilized an electric mechanism to enable multi-angle measurements.”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites [37] Herve, 2008, Direct Measurement of Total Emissivities at Cryogenic Temperatures: Application to Satellite Coatings, Cryogenics source

      The indexed copy’s Abstract (page not given) says the authors designed an apparatus to measure total directional emissivity, but it gives no sample capacity or mechanism for changing measurement angles. Searches for five samples, a motor or electric mechanism, and angular measurements returned only the repository record; the apparatus details are not present in the available copy. (LLM, conf=0.72)

      Experimental — accuracy not yet measured

  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    A liquid-nitrogen-cooled blackbody served as the FTIR radiation reference zero point in the Hao et al. system.

    “A liquid-nitrogen-cooled blackbody served as the FTIR radiation reference zero point.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [17] Hao, 2018, Vacuum Radiance-Temperature Standard Facility for Infrared Remote Sensing at NIM, Int. J. Thermophys. source

  • Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

    Premisecitation

    A stepper-motor-driven rotating sample stage in the Zhao et al. system enables automated switching between samples and efficient data acquisition.

    “Furthermore, a stepper-motor-driven rotating sample stage enables automated switching between samples and efficient data acquisition.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [54] Zhao, 2023, Preliminary Development of Emissivity Measurement System at Low Temperature Based on Radiometric Method, Cryogenics source

  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    The Hawks et al. system employed liquid helium to establish a cryogenic environment.

    “The system employed a liquid-helium to establish a cryogenic environment”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [44] Timmerhaus, K.D. (1971). Total Normal Emittances of Some Real Surfaces at Cryogenic Temperatures. Advances in Cryogenic Engineering, Springer. source

  • It may state two separate claims as one.

    Premisecitation

    When the spacing between radiating surfaces becomes comparable to the characteristic thermal radiation wavelength, the classical Planck law ceases to be valid and near-field effects become significantly enhanced.

    “However, when the spacing between radiating surfaces becomes comparable to the characteristic thermal radiation wavelength, the classical Planck law ceases to be valid, and near-field effects become significantly enhanced [20,21].”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [20] Narayanaswamy, 2009, Breakdown of the Planck Blackbody Radiation Law at Nanoscale Gaps, Appl. Phys. A source
    • cites [21] Ottens, 2011, Near-Field Radiative Heat Transfer between Macroscopic Planar Surfaces, Phys. Rev. Lett. source

      Checked before — its earlier verdict is held back until a new check runs.

  • It may state two separate claims as one.

    Interpretationcitation

    The shift from liquid-cryogen baths to refrigeration-based cooling systems extends the lower limit of the measurable temperature range, enabling continuous emissivity testing across a broad temperature range.

    “This transition not only eliminates the operational challenges and resource consumption associated with continuous cryogen replenishment but also extends the lower limit of the measurable temperature range, enabling continuous emissivity testing across a broad temperature range [59].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [59] Zhang, 2022, The Experimental Measurement of the Thermal Emissivity of a Black Coating from 50 K to 300 K, IOP Conf. Ser. Mater. Sci. Eng. source

      Checked before — its earlier verdict is held back until a new check runs.

  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    In most macroscopic heat transfer scenarios, emissivity values lie between 0 and 1, consistent with Planck's blackbody radiation theory.

    “In most macroscopic heat transfer scenarios, emissivity values lie between 0 and 1, consistent with Planck's blackbody radiation theory [19].”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [19] Lawson, 1997, A Closer Look at Planck’s Blackbody Equation, Phys. Educ. source

      Checked before — its earlier verdict is held back until a new check runs.

  • Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

    Premisecitation

    The Adibekyan et al. system used liquid nitrogen to cool the system and a Fourier-transform infrared spectrometer (FTIR) to acquire radiation signals.

    “Liquid-nitrogen was used to cool the system, and a Fourier-transform infrared spectrometer (FTIR) was employed to acquire radiation signals.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [49] Adibekyan, 2013, The Development of Emissivity Measurements under Vacuum at the PTB, Meas. Tech. source

  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    The Woods et al. apparatus employed a helium-cooled, high-absorption, low-noise absolute cryogenic radiometer as the detector.

    “The apparatus employed a heliumcooled, high-absorption, low-noise absolute cryogenic radiometer as the detector.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [48] Woods, 2012, Broadband Emissivity Calibration of Highly Reflective Samples at Cryogenic Temperatures, Metrologia source

  • It may state two separate claims as one.

    Premisecitation

    The experimental results of Hawks et al. exhibited excellent agreement with the reported data, validating the accuracy and reliability of the apparatus.

    “The experimental results exhibited excellent agreement with the reported data, thereby validating the accuracy and reliability of the apparatus.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [44] Timmerhaus, K.D. (1971). Total Normal Emittances of Some Real Surfaces at Cryogenic Temperatures. Advances in Cryogenic Engineering, Springer. source

  • It may state two separate claims as one.

    Premisecitation

    The optical system of Zhao et al., incorporating an MCT detector, is completely enclosed within a vacuum chamber, thereby eliminating the influence of windows and atmospheric radiation and significantly improving measurement accuracy.

    “The optical system, incorporating an MCT detector, is completely enclosed within a vacuum chamber, thereby eliminating the influence of windows and atmospheric radiation and significantly improving measurement accuracy.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [54] Zhao, 2023, Preliminary Development of Emissivity Measurement System at Low Temperature Based on Radiometric Method, Cryogenics source

  • It may state two separate claims as one.

    Premisecitation

    The researchers validated the performance of Nextel Velvet Black 811-21 coating under vacuum cryogenic conditions, demonstrating excellent agreement with a reference blackbody and confirming its suitability for use in precision thermal control applications.

    “In addition, the researchers validated the performance of Nextel Velvet Black 811-21 coating under vacuum cryogenic conditions [24], demonstrating excellent agreement with a reference blackbody and confirming its suitability for use in precision thermal control applications.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [24] Adibekyan, 2015, Emissivity Measurement Under Vacuum from 4 Μm to 100 Μm and from -40 °C to 450 °C at PTB, Int. J. Thermophys. source

  • Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

    Premisecitation

    The Zhao et al. system employs a Gifford-McMahon (G-M) cryostat as the cooling source, allowing the sample to reach a minimum temperature of 9.2 K.

    “The system employs a Gifford-McMahon (G-M) cryostat as the cooling source, allowing the sample to reach a minimum temperature of 9.2 K.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [54] Zhao, 2023, Preliminary Development of Emissivity Measurement System at Low Temperature Based on Radiometric Method, Cryogenics source

  • Probably not a substantial claim.

    Premisecitation

    To minimize background interference, all internal chamber walls were coated with a high-emissivity black layer.

    “To minimize background interference, all internal chamber walls were coated with a high-emissivity black layer.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [44] Timmerhaus, K.D. (1971). Total Normal Emittances of Some Real Surfaces at Cryogenic Temperatures. Advances in Cryogenic Engineering, Springer. source

  • It may state two separate claims as one.

    Premisecitation

    Dewasi et al. showed that the use of high-emissivity radiators significantly shortened thermal equilibration times and improved overall testing efficiency.

    “It was shown that the use of high-emissivity radiators significantly shortened thermal equilibration times and improved overall testing efficiency.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [53] Dewasi, 2023, The Development of a Novel Apparatus to Measure the Emissivity of High-Roughness Materials at 82 K, Meas. Sci. Technol. source

      Checked before — its earlier verdict is held back until a new check runs.

  • It may state two separate claims as one.

    Premisecitation

    The Herve et al. system employed a refrigerator as the cold source and incorporated a diamond window, enabling emissivity measurements over a temperature range of 20-200 K and a wavelength range of 6-800 μm.

    “A refrigerator was employed as the cold source and incorporated a diamond window, enabling emissivity measurements over a temperature range of 20-200 K and a wavelength range of 6-800 µm.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [37] Herve, 2008, Direct Measurement of Total Emissivities at Cryogenic Temperatures: Application to Satellite Coatings, Cryogenics source

      Checked before — its earlier verdict is held back until a new check runs.

  • It may state two separate claims as one.

    Interpretationreasoning

    Cryogenic refrigeration often requires sealed containers at cryogenic temperatures, whose walls obstruct light transmission and the establishment of an optical path, making reflection measurements difficult.

    “Secondly, cryogenic refrigeration often requires sealed containers at cryogenic temperatures, whose walls obstruct light transmission and the establishment of an optical path, making it difficult to implement reflection measurements.”
    Quote in the paperSubstantial claim

  • Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

    Premisecitation

    The pyrometer converted radiation signals from both the sample and the reference blackbody into voltage outputs, from which the sample emissivity was calculated.

    “The pyrometer converted the radiation signals from both the sample and the reference blackbody into voltage outputs, from which the sample emissivity was calculated.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [44] Timmerhaus, K.D. (1971). Total Normal Emittances of Some Real Surfaces at Cryogenic Temperatures. Advances in Cryogenic Engineering, Springer. source

  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    Kralik et al. reported that for chemically polished pure aluminum sheets (99.5% purity), emissivity at 20 K is less than one-quarter of its value at 320 K.

    “For example, Kralik et al. [6] investigated the radiative characteristics of chemically polished pure aluminum sheets (99.5% purity) over the temperature range 20 K ≤ T ≤ 320 K, reporting that the emissivity at T = 20 K is less than one-quarter of its value at T = 320 K.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [6] Hanzelka, 2016, Method for Measurement of Emissivity and Absorptivity of Highly Reflective Surfaces from 20 K to Room Temperatures, Metrologia source

      Checked before — its earlier verdict is held back until a new check runs.

  • Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

    Premisecitation

    Radiation signals in the Herve et al. system were detected using a bolometer, and emissivity values were calculated with reference to a calibrated blackbody.

    “Radiation signals were detected using a bolometer, and emissivity values were calculated with reference to a calibrated blackbody.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [37] Herve, 2008, Direct Measurement of Total Emissivities at Cryogenic Temperatures: Application to Satellite Coatings, Cryogenics source

      Checked before — its earlier verdict is held back until a new check runs.

  • It may state two separate claims as one.

    Premisecitation

    The radiometric method avoids complex thermal process inversion and thus offers significantly faster testing speeds.

    “This method avoids the need for complex thermal process inversion and thus offers significantly faster testing speeds [53].”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [53] Dewasi, 2023, The Development of a Novel Apparatus to Measure the Emissivity of High-Roughness Materials at 82 K, Meas. Sci. Technol. source

      Checked before — its earlier verdict is held back until a new check runs.

  • It may state two separate claims as one.

    Interpretationreasoning

    The radiometric method is particularly well-suited for rapid spectral emissivity measurements and studies of transient radiative processes.

    “It is particularly well-suited for rapid spectral emissivity measurements and studies of transient radiative processes.”
    Quote in the paperNot a substantial claim

  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    The Hawks et al. system utilized a gallium-doped germanium pyrometer as the radiation detector.

    “utilized a gallium-doped germanium pyrometer as the radiation detector.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [44] Timmerhaus, K.D. (1971). Total Normal Emittances of Some Real Surfaces at Cryogenic Temperatures. Advances in Cryogenic Engineering, Springer. source

  • Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

    Premisecitation

    The Hao et al. apparatus used a liquid-nitrogen cooled channel and Fourier-transform infrared spectrometry (FTIR) to measure emissivity above 190 K across the 1-1000 μm wavelength range.

    “Liquid-nitrogen cooled channel and Fourier-transform infrared spectrometry (FTIR) were employed to measure emissivity above 190 K across the 1-1000 µm wavelength range.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [17] Hao, 2018, Vacuum Radiance-Temperature Standard Facility for Infrared Remote Sensing at NIM, Int. J. Thermophys. source

  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    Hao et al. (2018) from the Chinese Academy of Metrology developed a vacuum radiation temperature standard apparatus for calibrating meteorological satellite infrared remote sensors.

    “In 2018, Hao et al. [17] from the Chinese Academy of Metrology developed a vacuum radiation temperature standard apparatus for calibrating meteorological satellite infrared remote sensors.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [17] Hao, 2018, Vacuum Radiance-Temperature Standard Facility for Infrared Remote Sensing at NIM, Int. J. Thermophys. source

  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    The reference radiation was directed into the spectrometer using an off-axis parabolic mirror in combination with a flat elliptical mirror, ensuring high-precision optical alignment and signal collection.

    “And the reference radiation was directed into the spectrometer using an off-axis parabolic mirror in combination with a flat elliptical mirror, ensuring high-precision optical alignment and signal collection.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [17] Hao, 2018, Vacuum Radiance-Temperature Standard Facility for Infrared Remote Sensing at NIM, Int. J. Thermophys. source

  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    Space probes frequently employ high-emissivity coatings to maintain instruments within optimal temperature ranges.

    “Specifically, space probes frequently employ high-emissivity coatings to maintain instruments within optimal temperature ranges [14][15][16]”
    Quote in the paperNot a substantial claim0 of 3 sources checked
    • cites [14] Youngquist, 2018, Cryogenic Deep Space Thermal Control Coating, J. Spacecr. Rockets source
    • cites [15] Krenn, 2022, Development of a Thermal Control Coating Optimized for Cryogenic Space Applications, IOP Conf. Ser. Mater. Sci. Eng. source

      Checked before — its earlier verdict is held back until a new check runs.

    • cites [16] Tuttle, 2012, A High-Resolution Measurement of the Low-Temperature Emissivity of Ball Infrared Black, AIP Conf. Proc. Am. Inst. Phys. source

  • It may state two separate claims as one.

    Interpretationreasoning

    Under cryogenic conditions, the radiometric method presents substantial design challenges due to weak radiation signals and strong background noise, necessitating highly sensitive detectors and precise shielding strategies.

    “However, under cryogenic conditions, the radiometric method presents substantial design challenges due to the inherently weak radiation signals and the strong influence of background noise, necessitating highly sensitive detectors and precise shielding strategies.”
    Quote in the paperNot a substantial claim

  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    Measurement techniques for emissivity are broadly categorized into direct and indirect methods.

    “Measurement techniques are broadly categorized into direct and indirect methods [18,32].”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [18] Honner, 2015, Survey of Emissivity Measurement by Radiometric Methods, Appl. Opt. source
    • cites [32] Zhu, 2020, An Accurate Instrument for Emissivity Measurements by Direct and Indirect Methods, Meas. Sci. Technol. source

      Checked before — its earlier verdict is held back until a new check runs.

  • It may state two separate claims as one.

    Premisecitation

    Yuan et al. measured the spectrally resolved directional emissivity of silicon carbide at 213 K and found pronounced wavelength-dependent behavior.

    “Yuan et al. [26] measured the spectrally resolved directional emissivity of silicon carbide at T = 213 K, revealing pronounced wavelengthdependent behavior.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [26] Yuan, 2025, Optimization of Low-Temperature Spectral Emissivity Measurement Scheme Based on Background Factor Evaluation, Opt. Express source

  • Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

    Interpretationcitation

    This variable emissivity technology enables precise and adaptive thermal regulation of spacecraft, offering improved stability and efficiency in space environments.

    “This technology enables precise and adaptive thermal regulation of spacecraft, offering improved stability and efficiency in space environments.”
    Quote in the paperNot a substantial claim

  • Probably not a substantial claim. The paper’s conclusions may not depend on it. The paper may give no reason why it holds.

    Interpretationnone given

    The infrared stealth performance of military equipment in high-altitude cold regions is contingent on the precise design and control of surface material emissivity under cryogenic conditions.

    “For instance, the infrared stealth performance of military equipment in high-altitude cold regions is contingent on the precise design and control of surface material emissivity under cryogenic conditions.”
    Quote in the paperNot a substantial claim

  • Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

    Premisecitation

    Hashmi et al. work provides a comprehensive summary of relevant experimental data and emphasizes the decisive influence of surface treatment on thermal radiation properties.

    “Also, their work provides a comprehensive summary of relevant experimental data and emphasizes the decisive influence of surface treatment on thermal radiation properties.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [61] Hashmi, 2024, Progress in Measuring Techniques and Thermal Radiative Properties of Metals at Cryogenic Temperatures: A Review, Cryogenics source

  • It may state two separate claims as one.

    Interpretationnone given

    Most current in situ testing studies remain at the experimental stage and primarily focus on macroscopic planar structures.

    “Regarding in situ testing techniques, most current studies remain at the experimental stage and primarily focus on macroscopic planar structures.”
    Quote in the paperNot a substantial claim

  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    A novel variable emissivity technology has been developed under low-temperature vacuum conditions by harnessing the distinctive radiation properties of thermochromic materials.

    “For example, a novel variable emissivity technology has been developed under low-temperature vacuum conditions by harnessing the distinctive radiation properties of thermochromic materials [68].”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [68] Tachikawa, 2022, Advanced Passive Thermal Control Materials and Devices for Spacecraft: A Review, Int. J. Thermophys. source

      Checked before — its earlier verdict is held back until a new check runs.

  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Interpretationnone given

    The radiometric method has the capacity to obtain emissivity data across spectral bands.

    “In addition, the radiometric method has the capacity to obtain emissivity data across spectral bands, thus offering significant potential to guide thermal radiation design for materials at specific wavelengths in the future.”
    Quote in the paperNot a substantial claim

  • Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

    Interpretationnone given

    Challenges remain in practical applications such as heat rectifiers and transistors, as well as in emissivity testing at the micro and nano scale for surface heterogeneity.

    “In contrast, challenges remain in practical applications, such as heat rectifiers and transistors, as well as in emissivity testing at the micro and nano scale for surface heterogeneity.”
    Quote in the paperNot a substantial claim

  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Interpretationreasoning

    The development of protective coatings capable of withstanding extreme low temperatures to suppress surface oxidation and stabilize emissivity has become a crucial approach for enhancing the thermal performance reliability of metal-based materials.

    “Consequently, the development of protective coatings capable of withstanding extreme low temperatures to suppress surface oxidation and stabilize emissivity has become a crucial approach for enhancing the thermal performance reliability of metal-based materials.”
    Quote in the paperNot a substantial claim
    • Rests on an assumption: Pure metal surfaces are susceptible to oxidation in cryogenic environments, resulting in substantial alterations to their radiative properties.

  • Probably not a substantial claim. The paper’s conclusions may not depend on it. The paper may give no reason why it holds.

    Interpretationnone given

    Precision observation platforms such as space telescopes require detectors to function in extremely low-temperature, highly stable thermal environments in order to suppress background thermal noise and achieve higher-precision deep-space observations.

    “Conversely, precision observation platforms such as space telescopes require detectors to function in extremely low-temperature, highly stable thermal environments in order to suppress background thermal noise and achieve higher-precision deep-space observations.”
    Quote in the paperNot a substantial claim

  • Probably not a substantial claim. It may state two separate claims as one.

    Premisecitation

    Zhang et al. review mainly provided a general overview of existing methods and instruments, briefly introducing the two main testing techniques along with sample data and instrument parameters, but it did not include in-depth discussion.

    “For example, A review by Zhang et al. [60] mainly provided a general overview of existing methods and instruments, briefly introducing the two main testing techniques along with sample data and instrument parameters, but it did not include in depth discussion.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [60] Zhang, 2022, A Review of Devices and Methods for Measuring Thermal Emissivity at Cryogenic Temperatures, IOP Conf. Ser. Mater. Sci. Eng. source

      Checked before — its earlier verdict is held back until a new check runs.

  • Probably not a substantial claim. The paper’s conclusions may not depend on it. The paper may give no reason why it holds.

    Interpretationreasoning

    By optimizing material composition, microstructure, and surface morphology, it is possible to develop materials with spectrally selective and angle-dependent radiation characteristics.

    “By optimizing material composition, microstructure, and surface morphology, it is possible to develop materials with spectrally selective and angle-dependent radiation characteristics.”
    Quote in the paperNot a substantial claim

  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    In the context of deep-space and extraterrestrial planetary exploration missions, extreme low temperatures and intense radiation environments pose severe challenges to spacecraft thermal control systems.

    “In the context of deep-space and extraterrestrial planetary exploration missions [65], extreme low temperatures and intense radiation environments pose severe challenges to spacecraft thermal control systems.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [65] Wrbanek, J.D., and Wrbanek, S.Y. (2020). Space Radiation and Impact on Instrumentation Technologies, NASA: Glenn Research Center. NASA/TP–2020-220002.

  • Probably not a substantial claim. The paper’s conclusions may not depend on it. The paper may give no reason why it holds.

    Interpretationnone given

    By using radiation heat exchange to shorten the time it takes to reach the equilibrium temperature, the availability of the equipment can be significantly improved.

    “By using radiation heat exchange to shorten the time it takes to reach the equilibrium temperature, the availability of the equipment can be significantly improved.”
    Quote in the paperNot a substantial claim

  • It may state two separate claims as one.

    Interpretationcitation

    The management of background noise has advanced from simple subtraction to complex modeling and active adjustment, thereby enhancing the accuracy of testing systems.

    “Furthermore, the management of background noise has advanced from simple subtraction [44] to complex modeling and active adjustment [26,55], thereby enhancing the accuracy of testing systems.”
    Quote in the paperNot a substantial claim0 of 3 sources checked
    • cites [44] Timmerhaus, K.D. (1971). Total Normal Emittances of Some Real Surfaces at Cryogenic Temperatures. Advances in Cryogenic Engineering, Springer. source
    • cites [26] Yuan, 2025, Optimization of Low-Temperature Spectral Emissivity Measurement Scheme Based on Background Factor Evaluation, Opt. Express source
    • cites [55] Yuan, 2024, Directional Spectral Emissivity Measurement Approach in a Broad-Spectrum at Low Temperatures: Device and Methodology Study, Measurement source
44 of 44

  • The paper relies on this without support.

    Pure metal surfaces are susceptible to oxidation in cryogenic environments, resulting in substantial alterations to their radiative properties.

    “Pure metal surfaces are susceptible to oxidation in cryogenic environments, resulting in substantial alterations to their radiative properties.”
1 of 1

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Shen study has conflicting publication years

    Minor

    Table 1 dates the cited Shen et al. study to 2019, whereas reference [52] lists it as a 2018 publication.

  • Kralik study has conflicting publication years

    Minor

    Table 1 dates the cited study to 2004, but its reference [33] lists a 2005 publication.

  • Anderson sample minimum differs from Table 1

    Minor

    The prose says sample surfaces reached 0.2 K and identifies 0.9-6 K as the radiation-source range. Table 1 instead labels 0.9-6 K as the sample-temperature range.

  • Temperature T is assigned to both sample and chamber

    Minor

    In the description of transient calorimetry, T is the recorded, changing sample temperature. The definition following Equation (4) instead calls T the instantaneous temperature of the vacuum chamber, whose walls were described as constant-temperature.

  • Ando study has conflicting publication years

    Minor

    Table 1 dates the cited Ando et al. study to 2018, whereas reference [51] lists it as a 2019 publication.

5 of 5

Citations

Cites

Flagged first, then by citations

Research works printed but not linked: 2

  1. Ageladarakis, P.A., and Obert, W. (1999, January 12–16). On the Emissivity of Silver Coated Panels, Effect of Long Term Stability and Effect of Coating Thickness. Proceedings of the Cryogenic Engineering Conference & International Cryogenic Materials Conference (CEC/ICMC 1999), Montreal, QC, Canada.
  2. Lohrengel, 1996, Thermal conductivity, total emissivity and spectral emissivities of the Nextel Velvet 811-21 coating (RAL 900 15 deep black matted), PTB, 106, 259

Cited by

Sorted by citations

Related

Metadata

Authors
Li, B., & Shen, F.
Affiliations
Chinese Academy of Sciences (CN)
Corresponding author
Shen, Fuzhi
ORCID
Shen, Fuzhi
Venue
Cryo
Publisher
MDPI AG
Published
2026-03-17
Volume
2
Issue
1
Pages
4
ISSN
3042-4860 (ISSN-L)
DOI
10.3390/cryo2010004
OpenAlex
W7138331494
Cited by
1
References
64
Citations by year
2026: 1
FWCI
1.97
Type
journal article
Language
en
Open access
Licence
Locations
Cryo (publishedVersion, cc-by)
Funders
National Natural Science Foundation of China (52407034)
Topics
  • Physical Sciences › Engineering › Civil and Structural Engineering › Thermal Radiation and Cooling Technologies
  • Physical Sciences › Engineering › Aerospace Engineering › Calibration and Measurement Techniques
  • Physical Sciences › Engineering › Computational Mechanics › Radiative Heat Transfer Studies
Keywords
thermal radiation, cryogenic temperatures, emissivity, radiative transfer, cryogenic thermal management, spacecraft thermal control, superconducting devices, high vacuum, functional materials

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

A language model drew the claims from the paper on 2026-11-10, under version 3 of the claim definition (model deepseek-v4.1-flash, prompt extract-v3).

A second model labelled each claim on 2026-11-10 (model jev-1.13-20260917, definition revision gold-guideline-v0.2).

Cited sources are checked with a language model’s help (gpt-6-sol).

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

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