Fiber Sensor for Simultaneous Measurement of Heart and Breath Rate on SmartBed

Abstract

Heart and breath rate are fundamental vital signs used for early detection in cardiac events. In this work, a sensor based on singlemode-multimode-singlemode (SMS) fiber structure was designed, fabricated, and tested for simultaneous measurement of heart and breath rate on a bed. A signal processing was used for obtaining the heart rate from the output signal of SMS fiber structure. In order to reduce noise in the heart rate signal, a Butterworth filter was employed. The results show that the proposed SMS fiber structure as a sensor has a relative error of 11% and 6% for measuring the heart and breath rate, respectively. The SMS fiber sensor gives a potency to measure the heart and breath rate simultaneously on a smart bed and suitable to be used in home and hospital.