嫦娥卫星中的紫外月球敏感器是一种以月球为姿态参考源的大视场成像式光学姿态敏感器。为了提高敏感器的环形视场和中心视场的高同轴度和对称度，需要对敏感器中的八棱锥反射镜进行高同轴度的法兰孔(内孔)加工，并与广角物镜进行高同轴度的精密装配。目前八棱锥反射镜的法兰孔(内孔)加工采用修切垫圈的方法完成，该方法装调反复、精度低。提出一种八棱锥反射镜高精度光学定心加工方法，该方法能够快速准确地找出其均方中面，并实现法兰孔的精密加工。在完成广角物镜定心加工后，可实现二者的高同轴度装配。装调结果证明，八棱锥8 个反射像的误差达到17.3″，优于设计值30″，法兰孔的同轴度和安装端面的跳动量均优于0.005 mm。整机装调后，八棱锥反射镜8 个子视场和物镜中心视场的对称度达到0.01 mm。该敏感器的装调在卫星绕月飞行中得到成功验证。

Ultraviolet lunar sensor, a part of CE lunar orbiting satellite, is a wide-field of view optical image sensor that references to the attitude of the moon. In order to ensure high coaxiality and symmetry of both annular and central fields, high coaxiality machining of the flange hole (central hole) for the octahedral pyramid mirror of the Ultraviolet lunar sensor is needed. Furthermore, high coaxiality assembly of the octahedral pyramid mirror and the objective lens are needed. The conventional method achieves the goal by changing washer thickness. It has obvious disadvantages such as alignment iteratively and lower precision. This paper presents a high-precision lens centering method for octahedral pyramid mirror. This method can find mean square neutral surface quickly and accurately, and realize precision machining of the flange hole (central hole). After the lens centering of the objective lens, the high coaxiality assembly of the octahedral pyramid mirror and the objective lens can be achieved. Experimental results demonstrate that the reflection image error of octahedral pyramid is 17.3″, it′s better than expected value 30″, and the coaxiality of flange hole and the end face runout are less than 0.005 mm The symmetry for the field of view of the octahedral pyramid relative to the center field of view of the objective len reaches 0.01 mm. This alignment of sensor has got verified successfully at CE-1 spacecraft′s space mission.