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Abstract
Due to the improvement of living standards, people’s attention to health has gradually increased. More and more people are willing to spend money and time on health management. This article reviews work on the vital signs monitoring system based on fiber optic interferometers, including the design of sensor structures, signal demodulation methods and data analysis. After a large number of trials, the system can achieve long-term stable heart rate (HR), respiration rate (RR) and body temperature monitoring, and the collected data can be used for health analysis. Due to the high sensitivity, low cost, and light weight of the interferometric fiber optic sensor, it can be integrated under a mattress or a cushion, which is very suitable for daily use. The system has great application prospects in the field of healthcare.
Highlights
In recent decades, with economic development and social progress, people’s health awareness has gradually increased, and more and more attention has been paid to medical care
Tan et al proposed in-line interferometers based on few-mode fiber (FMF) and multi-core fiber (MCF) for vital signs monitoring [15]
Some signal demodulation schemes are too large to be integrated into a compact vital signs monitor, such as phase demodulation based on piezoelectric transducer (PZT)
Summary
With economic development and social progress, people’s health awareness has gradually increased, and more and more attention has been paid to medical care. Vinci et al proposed a vital signs monitoring program based on the six-port interferometer radar principle, which can detect the subject’s respiration and heartbeat from the reflected original radar signal [4]. Hassan et al obtained the BCG signal by measuring the head movement caused by the heart blood ejection and estimated the heartbeat by calculating the movement of multiple feature points [6]. 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]
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