Terahertz scattering and water absorption for porosimetry
Open accessAbstract
We use terahertz transmission through limestone sedimentary rock samples to assess the macro and micro porosity. We exploit the notable water absorption in the terahertz spectrum to interact with the pores that are two orders of magnitude smaller (<1μm) than the terahertz wavelength. Terahertz water sensitivity provides us with the dehydration profile of the rock samples. The results show that there is a linear correlation between such a profile and the ratio of micro to macro porosity of the rock. Furthermore, this study estimates the absolute value of total porosity based on optical diffusion theory. We compare our results with that of mercury injection capillary pressure as a benchmark to confirm our analytic framework. The porosimetry method presented here sets a foundation for a new generation of less invasive porosimetry methods with higher penetration depth based on lower frequency (f<10THz) scattering and absorption. The technique has applications in geological studies and in other industries without the need for hazardous mercury or ionizing radiation.
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Total porosity can be calculated from a THz-TDS measurement by using effective medium theory and knowing the intrinsic refractive index of the solid matrix.
“The total porosity can thus be calculated from a THz-TDS measurement by utilizing effective medium theory and knowing the intrinsic refractive index of the solid matrix.”
From Measuring Open Porosity of Porous Materials Using THz-TDS and an Index-Matching Medium (2020) · cites this paper as [20]
THz-TDS has been demonstrated to measure porosity of rocks and pharmaceutical tablets and to analyze anisotropy of pore structures.
“This method has been demonstrated to measure the porosity of rocks [20] and pharmaceutical tablets [21,22,23] as well as to analyze the anisotropy of pore structures [18,24].”
From Measuring Open Porosity of Porous Materials Using THz-TDS and an Index-Matching Medium (2020) · cites this paper as [20]
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References 52 · Cited by 23
- Authors
- Heshmat, B., Andrews, G. M., Naranjo-Montoya, O. A., Castro-Camus, E., Ciceri, D., Sanchez, A. R., Allanore, A., Kmetz, A. A., Eichmann, S. L., Poitzsch, M. E., & Raskar, R.
- ORCID
- Venue
- Optics Express
- Publisher
- Optica Publishing Group
- Published
- 2017-10-24
- Volume
- 25
- Issue
- 22
- Pages
- 27370
- ISSN
- 1094-4087 (ISSN-L)
- OpenAlex
- W2765473451
- Cited by
- 23
- References
- 52
- Citations by year
- 2026: 3 · 2025: 1 · 2024: 5 · 2023: 1 · 2022: 2 · 2021: 2 · 2020: 3 · 2019: 5 · 2018: 1
- FWCI
- 1.02
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Optics Express (publishedVersion)
- PubMed (publishedVersion)
- DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Terahertz technology and applications
- Physical Sciences › Engineering › Mechanics of Materials › Hydrocarbon exploration and reservoir analysis
- Physical Sciences › Engineering › Mechanics of Materials › Thermography and Photoacoustic Techniques
- Keywords
- terahertz scattering, water absorption, porosimetry, limestone, sedimentary rock, microporosity, macroporosity, mercury injection capillary pressure, terahertz transmission
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