Based On Fpga + Dsp Structure Of Acousto-optic Signal Processing System Design

The acousto-optic signal post-processing technique was researched and the FPGA+DSP acousto-optic signal post-processing system was designed in this paper. The CCD(Charge Coupled Device)acousto-optic signal acquisition module, FPGA(Field Programmable Gate Array)digital signal pre-processing module, DSP(Digital Signal Processor)digital signal post-processing module and the USB(Universal Serial Bus)communication module were introduced in detail. Besides, the software was designed in this paper.The Bragg acousto-optic spectrum experimental system was established. The location and amplitude of Bragg's diffracted light at different frequency was researched in this paper. Experimental results were simulated by using MATLAB, the methods of polynomial fitting and Fourier fitting was used to resolve the problem of Bragg-device's non-linear diffraction efficiency, the non-linear location of different frequency diffracted light and the non-linear amplitude of diffracted light. That can reduce the spatial location and amplitude fluctuation of diffracted light by non-linear effect and lay the foundation for signal processing.Experiment concerning the location and amplitude of Bragg's diffracted light at different frequency was done, which is respectively using 7ID001S non-cooling-type linear CCD acquisition system and FPGA+DSP acousto-optic signal post-processing system. Experimental results show that the FPGA+DSP acousto-optic signal post-processing system is feasible.