多通道拉曼光谱仪的主控系统设计

Design of Main Control System for Multi-Channel Raman Spectrometer

根据532 nm、633 nm、785 nm和1064 nm 4种波长激光照射到物质上的拉曼光谱采集需求,设计了四通道拉曼光谱仪的主控系统。该系统采用Hamamatsu公司的S11511-1106型面阵CCD和G14237-512WA型线阵铟镓砷图像传感器作为光电转换器;将STM32F407作为控制芯片,实现四通道图像传感器、四通道激光器和四通道电机的控制;利用FPGA实现图像传感器的驱动、A/D模数转换以及光谱数据采集;通过串口将数据传输到电脑端上位机显示。经实验测试,上位机端光谱信号显示准确,可以实现光谱的单次或连续采集;影响光谱成像的电压误差稳定在1.5%以内,纹波系数控制在2%以内。该系统实现了四通道光谱数据采集和传输,可以拓展到其他像元器件设计中,具有一定应用价值。

The main control system of the four-channel Raman spectrometer was designed according to the requirement of the acquisition of the material Raman spectrum irradiated by the laser at 532 nm,633 nm,785 nm and 1064 nm.In this system,S11511-1106 planar array CCD and G14237-512WA linear array indium gallium arsenic image sensor of Hamamatsu company are used as photoelectric converters.STM32F407 is used as the control chip to realize the control of four-channel image sensor,four-channel laser and four-channel motor.FPGA is used to drive the image sensor,A/D analog-to-digital conversion and spectral data acquisition.The data is transmitted to the upper computer through the serial port for display.The experiment shows that the spectral signal of the upper computer is accurate,and the single or continuous acquisition of the spectrum can be realized.The voltage error affecting spectral imaging is stable within 1.5%,and the ripple coefficient is controlled within 2%.The system realizes the acquisition and transmission of four-channel spectral data,which can be extended to the design of other image components and has certain application value.