Research on physiological data acquisition system based on dual channel fiber optic sensor
In order to meet the application of micro bending fiber optic sensors in blood pressure detection,an additional sensor is added to the original sensor,and the raw data are preprocessed through programmable logic devices.The system consists of two micro bending fiber optic sensors,two analog preamplifiers,two ADCs,microprocessor,programmable logic device,and WIFI module.The experimental results show that the system can quickly perform digital filtering and extract physiological parameters from the raw data,calculate the phase of two ballistocardiogram(BCG)signals and the instantaneous phase difference between them,and finally predict blood pressure values.