A microwave sensor for wrist pulse detection using self-oscillating CSRR

Bo Zhang; Chieh-Sen Lee; Xiang-Yan Liu; Yao Li; Yi Ding

doi:10.1117/12.2645560

15 August 2022 A microwave sensor for wrist pulse detection using self-oscillating CSRR

Bo Zhang, Chieh-Sen Lee, Xiang-Yan Liu, Yao Li, Yi Ding

Proceedings Volume 12308, International Conference on Optoelectronic Information and Computer Engineering (OICE 2022); 1230804 (2022) https://doi.org/10.1117/12.2645560
Event: International Conference on Optoelectronic Information and Computer Engineering (OICE2022), 2022, ONLINE, China

Abstract

In this paper, a microwave sensor using self-oscillating complementary split-ring resonator (SO-CSRR) for wrist pulse detection is proposed. The CSRR used in this article can generate a highly concentrated electric field, enough to detect the tiny distance variation between the CSRR and the wrist skin caused by the radial artery in the near field region. This distance variation will change the signal phase passing through the CSRR. By injecting the phase-modulated signal into the SO-CSRR, it generates an amplitude-varying signal carrying the wrist pulse information. The output signal of the SO-CSRR is then amplitude-demodulated by the radio frequency (RF) detector (DET). The measured results are highly consistent with the actual situation and prove that the method is feasible.

Citation Download Citation

Bo Zhang, Chieh-Sen Lee, Xiang-Yan Liu, Yao Li, and Yi Ding "A microwave sensor for wrist pulse detection using self-oscillating CSRR", Proc. SPIE 12308, International Conference on Optoelectronic Information and Computer Engineering (OICE 2022), 1230804 (15 August 2022); https://doi.org/10.1117/12.2645560

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