The applied study of optical fiber sensor in respiratory signal measuring system

The paper introduces a system of optical fiber examination for respiratory frequency based on computer on slice, model 89C51, including the overall system design, hardware and software design. Adopting optical fiber respiratory sensor, and going through filter shaping circuit, the system proceed just-in-time testing of respiratory frequency with SCM, and displaying the number of respiratory frequency. The system will be automatically alarming when respiratory frequency is over its critical point. In addition, upper limit and inferior limit of respiratory frequency can be set accordingly by Keyboard. The system charactering with convenience and practicality, can be used as both a frequency warding instrument at home. and a subsystem of multi-function surveillance system. Meanwhile, in biomedical research and clinical patients' monitoring, the system will be also very well functioned.