Non-invasive Vital Signs Monitoring Based on Polarization Maintaining Fiber and Sagnac Interferometer

Vital Signs Monitoring Based on Interferometric Fiber Optic Sensors

“…This kind of interferometer has high sensitivity to rotation and is mainly used in fiber optic gyroscopes. J. Qu et al conducted some research on the use of SI-based sensors for vital signs monitoring [17]. Since this situation cannot introduce the rotation of the sensor, the sensor introduces a phase difference through a single-mode polarization-maintaining fiber (PMF) inserted into the Sagnac loop.…”

“…Due to the high cost of the FBG sensors and the limited sensitivity of the intensity-based sensors, researchers chose the interferometric FOS for vital signs monitoring. Researchers have dedicated much time and effort to the design of sensor structures [12][13][14][15][16][17][18][19][20][21][22][23], demodulation methods [12,[24][25][26][27][28][29][30][31][32][33][34][35][36] and the application of vital signs monitoring [12][13][14]16,[18][19][20][21][22][23][35][36][37][38][39][40][41][42][43][44][45].…”