基于FPGA的PSD多路光电数据采集系统设计

Design of Multi-Channel Synchronized Photoelectric Acquisition System Based on PSD Sensor and FPGA

以EP2C8Q208C8为主控芯片,利用AD73360进行多路、同步模数转换,对两维PSD传感器信号进行数据采集,实现高精度的多路光电数据采集系统设计。通过硬件编程,系统能够实现4路、64 kHz、12位有效数据位、16位分辨率的光电信号获取,经FPGA运算后实时输出入射光位置,完成光电位置探测功能。试验数据表明:系统位置探测分辨率优于10μm,系统响应时间小于5 ms,适用于快速、同步光电信号获取设计中,为有类似需求的PSD后续处理电路应用提供了一种可供借鉴的技术参考。

A photoelectric data acquisition system was designed.The master chip used EP2C8Q208C8 and the analog-to-digital chip was AD73360.When photo-currents emerged from a 2D-PSD sensor,these multi-channel signals were changed into voltages.Then these voltages were converted to 16-bit datum by AD73360.All data operated by FPGA,the position of the incidence ray point on the 2D-PSD will be achieved.After analyzing the result of experiment,the whole system is capable of 4-route synchronized acquisition,64 kHz max sampling,12-bit real precision and 16-bit resolution.The real resolution of ray point on the PSD is 10 μm,and the time response is less than 5 ms.This system is suit to the application of high-speed,synchronized photoelectric detection or other fields that need data acquisition.