Low-cost wearable device based D-shaped single mode fiber curvature sensor for vital signs monitoring

Li, Jie, Liu, Bin, Liu, Juan, Shi, Jiu-Lin, He, Xing-Dao, Yuan, Jinhui and Wu, Qiang (2022) Low-cost wearable device based D-shaped single mode fiber curvature sensor for vital signs monitoring. Sensors and Actuators A: Physical, 337. p. 113429. ISSN 0924-4247

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Official URL: https://doi.org/10.1016/j.sna.2022.113429

Abstract

A low-cost wearable pulse and respiratory monitoring system based on D-shaped single mode fiber (SMF) curvature sensor is proposed and investigated. The curvature sensing performance of D-shaped SMFs with different transmission loss are tested and analyzed, and the sensitivity up to − 7.208%/m−1. The D-shaped optical fiber structure is encapsulated by polydimethylsiloxane (PDMS) and implanted in a wrist strap, which realizes good wearability and comfort in the process of human pulse monitoring. The system adopts laser source module and signal acquisition module for integrated and miniaturized design, and real time signal acquisition using Field-Programmable Gate Array (FPGA). The real-time monitoring of pulse signal intensity and frequency before and after exercise was realized. The results show that pulse intensity increased after exercise, with a 10%− 30% increase in pulse frequency, which is consistent with the results in medical theory. In addition, the D-shaped SMF encapsulated by PDMS also was implanted into the belt, which also successfully applied to the monitoring of respiratory signals under quiet and walking conditions.

Item Type: Article
Additional Information: Funding information: This work was jointly supported by National Natural Science Foundation of China (NSFC) (11864025, 62065013, 61865013 and 62175097); Natural Science Foundation of Jiangxi Province (Grant No. 20192ACB20031 and 20192ACBL21051), Key R&D Projects of the Ministry of Science and Technology of China (2018YFE0115700).
Uncontrolled Keywords: curvature sensor, D-shaped fiber, wearable device, pulse, respiration
Subjects: G400 Computer Science
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 15 Feb 2022 14:07
Last Modified: 15 Feb 2022 14:15
URI: http://nrl.northumbria.ac.uk/id/eprint/48472

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