基于FPGA图像采集处理的激光告警中波长测量系统设计
Design of Wavelength Measurement System in Laser Alarm Based on FPGA Image Acquisition and Processing

针对国内激光告警系统高精度和高传输速率研究的需要，本文基于光栅衍射效应原理对激光方位角、俯仰角和波长的计算需要，通过CMOS传感器驱动电路设计、SDRAM存储接口设计、USB协议的编写和上位机程序编写完成了采集显示系统的设计。本文设计采样时钟达到24 Mhz，传输速率达到480 Mbps，波长测量误差小于5个像素单位。通过与其它激光波长测量方案相对比，证明了系统稳定性采集速率、采集精度均达到设计需求。实验采用1313 nm波长的激光器，测试结果波长误差小于9 nm。
In view of the domestic laser alarm system of high precision and high transmission rate research need, this paper is based on the principle of grating diffraction effect of laser azimuth and pitching angle and wavelength of computing needs, through the CMOS sensor drive circuit design, SDRAM storage interface design, the writing of USB protocol and PC program written to complete the collection and display system design. In this paper, the acquisition rate reaches 36 fps, the transmission rate reaches 480 Mbps, and the wavelength measurement error is less than 5 pixel units. Compared with other laser wavelength measurement schemes, it is proved that the system stability acquisition rate and acquisition accuracy meet the design requirements. A 1313 nm laser was used in the experiment, and the wavelength error was less than 9 nm.