A novel sensor for wrist based optical heart rate monitor
Abstract
The growing demands of continuous healthcare and hence physiological monitoring necessitates a system with high reliability and accuracy. Wearable used for continuous cardiological parameter estimation from wrist use reflective photoplethysmography technique that has certain limitations which are imperative. One such constraint is skin pigmentation of the subject. In the present work a sensor module design is proposed addressing to the anomalies due to optical properties of skin. A novel 590 nm (yellow-orange) wavelength based optical system is tailored suitably to maximize the signal quality acquired. The proposed setup is validated on a conglomeration of subjects in terms of age, gender and skin tone. A generous agreement between coherent measures for signal quality shows that the proposed wavelength holds an advantage over its shorter counterpart when subjected to varied skin pigmentation levels. A maximum improvement factor of 71 is observed in case of perfusion index, 31 for pulsatile strength and 3 for SNR. The details of sensor design, experimental setup, validation protocol, observations and inferences drawn from the study are presented.
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For Fitzpatrick IV individuals, the perfusion index increased between 1.2 and 7.1 times with the use of 590 nm light, pulsatile strength increased by 1.1 to 3.1 times, and SNR increased by 1.3 to 2.6 times, although no statistical significance analyses were performed.
“For Fitzpatrick IV individuals, the perfusion index increased between 1.2 and 7.1 times with the use of the 590 light, while pulsatile strength increased by 1.1 to 3.1 times and SNR increased by 1.3 to 2.6 times, although no statistical significance analyses were performed [51].”
From Sources of inaccuracy in photoplethysmography for continuous cardiovascular monitoring (2021) · cites this paper as [51]
Mohapatra et al. found that with a multiwavelength PPG device, perfusion index, pulsatile strength, and SNR all increased when data collected with the 590 nm LED were analyzed.
“With 20 subjects ranging from Fitzpatrick II to Fitzpatrick IV, the perfusion index (AC/DC), pulsatile strength, and SNR were all found to increase when data collected with the 590 nm LED were analyzed.”
From Sources of inaccuracy in photoplethysmography for continuous cardiovascular monitoring (2021) · cites this paper as [51]
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Self-citation
- Authors
- Mohapatra, P., Preejith, S. P., & Sivaprakasam, M.
- Affiliations
- Indian Institute of Technology Madras (IN)
- Indian Institute of Technology Delhi (IN)
- Venue
- 2017 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)
- Publisher
- IEEE
- Published
- 2017-05
- Pages
- 1-6
- ISSN
- 2642-2069 (ISSN-L)
- OpenAlex
- W2734478367
- Cited by
- 19
- References
- 10
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 3 · 2023: 1 · 2022: 2 · 2021: 2 · 2020: 3 · 2019: 1 · 2018: 5
- FWCI
- 4.88
- Type
- conference paper
- Language
- en
- Open access
- closed
- Locations
- IEEE International Instrumentation and Measurement Technology Conference (publishedVersion)
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Non-Invasive Vital Sign Monitoring
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Heart Rate Variability and Autonomic Control
- Physical Sciences › Computer Science › Signal Processing › Biometric Identification and Security
- Keywords
- wrist-worn sensors, photoplethysmography, skin pigmentation, sensor design, perfusion index, signal-to-noise ratio, physiological monitoring, wearable devices
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