基于FPGA的微型光谱仪CCD系统设计

Design of Micro-spectrometer CCD System Based on FPGA

论述了一种基于FPGA的高灵敏度的CCD光谱仪检测系统设计方案和实现方法。该设计方案采用平场凹面光栅为光学系统,以FPGA为主控芯片,由A/D芯片完成对CCD输出信号的模数转换。采用FPGA实现对CCD的时序和A/D转换时序的驱动,然后通过USB与上位机进行通信,实现实时光谱数据的采集、传输与显示。实验结果表明,该系统具有较好的光谱采集效果,采集精度为16 bit,光谱采集范围为300~800 nm,并且该系统数据量较大,具有良好的重复性及可拓展性,能够广泛在光谱测量中获得较高的应用价值。

The design and implementation of a high sensitivity CCD spectral detection system based on FPGA were introduced.The design scheme took flat field concave grating as the optical system and FPGA as the main control chip,and the A/D chip is analog to digital conversion of the CCD output signal.FPGA was used to realize the drive of CCD timing sequence and A/D conversion timing sequence,and then USB was used to communicate with the host computer to realize the collection,transmission and display of real-time spectral data.Experimental results show that the system has a good spectrum collection effect,the collection accuracy is 16 bit,the spectrum collection range is 300~800 nm,and the system has a large amount of data and good repeatability and expansibility.It can be widely used in spectrum measurement to obtain high application value.