大口径望远镜波像差的外场检验方法

Method of Wavefront Error Test in the Outfield for Large Aperture Telescope

为在外场环境下对大口径望远镜进行系统波像差的检验,研制了一套具有高探测能力的Shack-Hartmann波前传感器.利用恒星作为光源,对口径1m、焦距11m的大口径望远镜进行了波像差检验实验,测量结果为系统波像差在0.39λ～0.46λRMS之间,且随着俯仰角的增加而增大,主要像差形式为3阶0°像散,与星点检验的结果一致.

For testing the wavefront error of large aperture telescope in the outfield,a Shack-Hartmann wavefront sensor with high detect ability was developed.Using star as light source,the wavefront error of the telescope with 1 m diameter and 11 m focal length was test through the sensor.The results show that the wavefront error of the telescope is about 0.39λ~ 0.46λRMS,and the error increases as the elevation angle of the telescope.The dominating aberration is 3rd 0°astigmatism,and the result is identical to that of star test.