Applications On Lateral Stress And Vibration Sensing Based On Fiber Microstructure Sensor

In recent years, with the development of fiber optic sensing technology and networkcommunication technology, health monitoring system has become a hot issue. Medical healthmonitoring system is capable of real-time monitoring the patient’s most important physical signs,such as heart rate, breathing, blood pressure and others, and the need for real-time monitoring thepatient’s insomnia condition(sleep position) is also needed. Traditional monitoring methods usingartificial escort, consumes a lot of manpower and resources, we propose a health monitoringsystem based on fiber Bragg grating sensor network, which has big advantages, a simplestructure, small size, long life, anti-electromagnetic interference, high sensitivity. The system cannot only achieve accurate real-time monitoring of patient vital signs, without escort, which hasan important reference value for the development of China’s medical industry.In this thesis, domestic and foreign medical health monitoring system and the developmentof fiber grating sensing technology is investigated profoundly, and the main content of this thesisis to study the key devices of health monitoring system. Secondly, the current status anddemands of medical and health monitoring system are analyzed, the design solution of fiberBragg grating (FBG) sensor system is proposed and confirmed, including: Principles of fibergrating sensors, production methods, packaging, transverse stress analysis, etc. By means ofoptical fiber sensing technology for distributed fiber sensing array measurements, real-timemonitoring of the patients’ vital signs parameters is achieved. Then, a no-core optical fiber (NCF)based vibration sensor is studied, using NCF as the probe of the sensor, which is spliced betweentwo single mode fiber jumpers. The vibration source is PZT piezoelectric ceramic withexperimental detection range of nearly10Hz-60kHz and accuracy of up to1Hz. Finally, theresults of encapsulated structure, accuracy, stability with time, temperature response, etc. areabtained. The structure of the multiplexing method has been explored and built up, we ve alsoimplemented experiment measuring all relevant parameters.