TY - JOUR
T1 - Low-cost wearable device based D-shaped single mode fiber curvature sensor for vital signs monitoring
AU - Li, Jie
AU - Liu, Bin
AU - Liu, Juan
AU - Shi, Jiu-Lin
AU - He, Xing-Dao
AU - Yuan, Jinhui
AU - Wu, Qiang
N1 - 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).
PY - 2022/4/16
Y1 - 2022/4/16
N2 - 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.
AB - 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.
KW - Curvature sensor
KW - D-shaped fiber
KW - Wearable device
KW - Pulse
KW - Respiration
UR - http://www.scopus.com/inward/record.url?scp=85124401312&partnerID=8YFLogxK
U2 - 10.1016/j.sna.2022.113429
DO - 10.1016/j.sna.2022.113429
M3 - Article
VL - 337
JO - Sensors and Actuators, A: Physical
JF - Sensors and Actuators, A: Physical
SN - 0924-4247
M1 - 113429
ER -