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《Infrared Technology》 2019-06
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High-speed Spectrum Inversion System Based on FPGA

TIAN Jing;Changchun Vocational Institute of Technology;  
To acquire and invert spectral data at high speed, a high-speed spectral inversion system was designed using a field programmable gate array(FPGA). A charge-coupled device(CCD) driver module is controlled by the FPGA to enable the CCD to acquire interference fringe data at high speed, and then transmit it to the FPGA processing module. In this study, the FPGA hardware structure of high-speed data acquisition and processing was designed. Through simulation data, the temporal logic relationship between the acquisition and processing modules was analyzed. To meet the requirements of system spectral inversion accuracy and speed simultaneously, we compared the spectrum distribution under 8-, 10-, and 12-bit data depth conditions. The experimental results showed that the smaller the bit depth, the faster the speed, but the contrast of spectral inversion is reduced. By contrast, the larger the bit depth, the better the spectral inversion contrast, but the slower the processing speed. Considered comprehensively, this system adopts a 10-bit deep structure. Experiments were performed on the spectral inversion of a laser with a central wavelength of 975 nm, and the results were compared with MATLAB inversion data. The results show that the detection accuracy of this system meets the requirements, and the speed is faster.
【Fund】: 国家自然科学基金青年基金(61608023)
【CateGory Index】: TN791;O433
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