激光扫描转镜扫描轨迹的分析计算

Analysis and Calculation of Scan Trace of Laser Scanning Rotation Mirror

扫描转镜是激光扫描探测系统的重要组成部分。从几何光学原理出发,以旋转六面转镜扫描为例,推导出扫描轨迹的表达式,分析了入射光线位置与扫描轨迹的关系,并给出了扫描角度与扫描轨迹的关系曲线。系统本身的结构特点是产生扫描非线性和非对称性的根源。为了减小扫描轨迹的非线性,提出了一种使用曲面反射镜的扫描系统,并对其扫描轨迹进行了求解和计算。由计算结果可知,该系统能有效克服平面转镜扫描系统的非线性特性。

The scanning rotation mirror is one of the most important components in laser scanning detecting system.Based on the principle of geometrical optics,an analytical expression for the scan trace of hexahedral column rotation mirror is derived.The relationship between the position of incident beam to rotation mirror and the scan trace is also analyzed.In addition,the relation curve of scan trace versus scanning angle is produced.The structural characteristics of the system are the origin of creating scanning nonlinearity and asymmetry.In order to reduce the nonlinearity of scan trace,a curved rotating mirror scanning system is proposed,and the scan trace for curved rotating mirror is computed.The numerical results for the designed rotation mirror system show that the system can solve the nonlinearity problem of plane rotating mirror effectively.