基于DSP和FPGA的多路型光纤光谱仪系统

描述了一种能同时快速地测量多达八组的光谱信号并具有实时光谱处理能力的新型多路型光纤光谱仪系统。该多路型光纤光谱仪以多个CCD作为光电探测器,以FPGA作为控制核心产生各种控制时序,利用DSP进行光谱数据处理并实现与PC机的USB通信。概述了整个系统的构成,给出了光谱采集的光学平台设计,研究了在DSP和FPGA控制下光谱数据的采集和处理过程。为了避免测量时各个通道光谱数据的相互串扰并控制光谱峰值的随机漂移,除采用传统的滤波电路和电源稳压技术之外,提出了利用FPGA内部编程的方法来解决IC芯片内部电容效应的新技术。光谱测试结果表明,该系统具有良好的长期稳定性、较大的信号动态范围和较高的信噪比,适合于各种场合的光谱及相关参数测量。

DSP and FPGA -based multi-channel fiber-optic spectrometer

By using eight linear array CCDs as the photo detector,a new type of multi-channel fiber optic spectrometer was presented to measuring eight channel spectra simultaneously and swiftly. In the system, a FPGA was acted as the controlling unit to generate time sequenee and the spectral data were processed by the DSP, it communicated with the PC by its inner USB module. This paper introduces the structure of the whole system and the method of the optical system design, also describes the process of spectral data colleeting under the control of the DSP and FPGA. A specific FPGA programming technique is brought forward to settle the capacitance effect inside the IC chip to prevent signal interference between two adjacent channels. The results show that the system has a good long-term stability, a large signal dynamie range and a higher SNR. The spectrometer can be used to measure speetrum or related parameters in various situations.