斜入射条件下角锥棱镜光学特性分析

Analysis of optical characteristics of cube corner retro-reflector with oblique incident angle

角锥棱镜具有严格的后向反射特性。激光斜入射条件下,会造成角锥棱镜有效反射面积的减小及附加光程差,对激光主动探测及激光精确测距产生影响。利用几何光学原理,建立了斜入射条件下角锥棱镜有效反射面积数学模型,针对激光精确测距要求,推导了附加光程差与入射角的关系。理论分析及数值仿真结果表明,激光主动探测系统回波功率随入射角的增大而减小,不同的入射方位角对应不同的最大可探测入射角。对于给定的角锥棱镜,测距精度随入射角的增大而减小,在角锥棱镜最大允许入射范围内,测距精度误差可达2.85 mm。这对角锥棱镜的设计和实际应用具有指导意义。

Cube corner retro-reflector（CCR）has strictly backward return characteristics.The effective reflection area and the additional light path will change with laser′s oblique incident angles,which will affect the processes of active laser detection and accurate laser range measurement.The model of effective reflection area of CCR is built with laser′s oblique incident angle by using geometrical optics.According to the demand of accurate range measurement,the relationship between additional light path and incident angle is deduced.Theoretical analysis and simulated results show that echo power of active laser detection system will decrease as the incident angle increase and different azimuth angles have different maximal incident angles.The results also show that the precision of range measurement will decrease as the incident angle increase and the range error can reach to 2.85 mm at the maximal incident angle.The above conclusion provides a very useful guidance for design and application for CCR.