为解决扫描镜摆角实时动态非接触测量问题,基于激光检测技术和CCD探测技术,提出一种红外地球敏感器扫描镜摆角激光动态测试方法,并研制了扫描镜摆角动态测试系统,其可实现扫描镜的摆动频率、零位角、幅值、峰峰值平均等参量的动静态激光非接触测量。介绍了系统的组成和总体结构,着重对扫描镜摆角动态测量理论和大视场、大相对孔径特殊线性扫描光学系统的设计方法进行了分析与探讨,通过建立系统的数学模型,解决了测量数据误差修正与图形处理问题。对测量系统的精度进行了验证,结果表明系统的摆角测量范围为0～±12°,分辨力为0.01°,动静态测量精度优于±0.04°。

In order to settle the problem of real-time and dynamic non-contact measuring the swing angle of scanning mirror, a method of laser dynamically measuring swing angle of scanning mirror for the infrared earth sensor based on laser measuring technology and CCD detecting technology is presented. System for dynamically measuring swing angle of scanning mirror is developed, which can accomplish the dynamic and static laser non-contact measurement for the parameters of scanning mirror which are swing frequency, angle of zero position, amplitude value, average of peak values, etc. The composition and overall structure of system is introduced. Emphasis on analyzing and discussing the theory of dynamically measuring swing angle of scanning mirror, the method of design for large field of view, large relative aperture and special linear scanning optical system, the problems of error correction for measured data and graph manipulation are settled by established mathematic model of the system. The accuracy of measurement system is verified by experiment, the results indicated that measurement range of system for swing angle is 0°～±12°, distinguishing ability of the system is 0.01°, accuracy of dynamic and static measurement is less than ±0.04°, this method of dynamically measuring swing angle is suitable.