一种自准直仪摄远物镜光学结构的设计

The optical structure design of telephoto lens for autocollimator

设计了一种采用波长为650 n m 的单色红光为光源,焦距为450 mm,D /f′= l ： 9. 375,视场角2w = 0. 6°的摄远物镜,主要应用在自准直仪上,利用其筒长小于系统焦距的特点,可以使仪器的体积更加小巧,方便携带.摄远结构可校正系统的球差、彗差、色差、象散和场曲.采用波长为650 n m 的红光光源,所以不用考虑色差的因素.摄远结构筒长L 与系统焦距f′ 之比控制在2/3.3/4之间,摄远比达到了 0. 54.M T F 曲线也达到了衍射极限,可有效提高检测精度,仪器的测量范围在1. 5 m 之内.最后推导出了通过修调正负镜组之间的间隔来对仪器的示值误差进行补偿公式.

This paper presents a telescope with a wavelength of 650 nm of red light source,f′=450mm,D/f′=1∶9.375,FOV=0.6°.Mainly used in Autocollimator,with its features of barrel length of less than focal length,it can make the instrument more compact,which results in a portable instrument.Telephoto structure can correct the aberration,coma,chromatic aberration,astigmatism and curvature of field of the system,without consideration of chromatic aberration because of using a wavelength of 650 nm red light.The proportion of telephoto structural length L and focal length f′is from 2/3to 3/4.It reaches 0.54.MTF curve has reached a diffraction limit,which can effectively improve the detection accuracy.The measuring range of the instrument is between 0to 3m.At last,our derivation of a formula that by adjusting the distance between the lenses could compensate the indication error.