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

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.