Design of signal collection and processing system of fiber probe based on DSP

ZHOU Manping, LIN Jiachun, ZHANG Bin, HAN Xin
（College of Mechanical Engineering & Applied Electronics Technology,
Beijing University of Technology, Beijing 100124, China）

Abstract: In order to synchronously collect and fleetly process the threechannel fiber signal of fiber bragg grating(FBG) 3D probe, an embedded signal collection and processing system based on digital signal processor(DSP) was designed. The TMS320F2812 was used as a processor, which frequency was 150 MHz, and AD7656 as the A/D converter, which could synchronously sample the sixchannel signal and had 16bit DC accuracy. It was realized that this system could synchronously collect and realtime calculate the sum of the threechannel fiber signal. When the results satisfied the reference value, a trigger signal was sent to the external device by the system. Through using serial port to communicate with PC, the samplingaccuracy of the system was verified and the data was preserved. The test results show that the system has good synchronouscapability, high responsespeed and samplingaccuracy less than 3 mV, so it can be used to collect and process the signal of FBG probe.
Key words: fiber bragg grating(FBG); digital signal processor(DSP); TMS320F2812; AD7656