多棱镜分光膜的镀制

Spectroscopic Film Coating for the Multi-Prism System

云南天文台新研制的低纬子午环光路中有两套多棱镜系统 ,它的作用是产生多路光作几个方向准直器校准光路 ,提高测量精度。我们考虑到光源和接收器件二极管阵的光谱响应曲线不同 ,光路中入射光需要通过多个分光膜面 ,而多路光的出射光谱应相等 ,因此采用不同层次的介质膜 ,使之达到作用效果。

The light sources and receiving devices have different spectral width.Fo r a diode array or CCD,the spectral response at the infrared wavelength,in addit ion to spectroscopic properties in visible light,should be taken into account in the design of a spectroscopic film.This makes the development of the spectrosco pic film complicated.For the increase of measurement accuracy,two multi-prism sy stems in the optics of the newly developed low-latitude meridian circle at Yunna n observatory are adopted to produce multiple light rays for the calibration of the collimator optics from several directions.Since the light source and the dio de array have different spectral response curves,the incident light rays will pa ss through multiple spectroscopic films.In order to obtain the same outcoming sp ectra after the films,different number of medium films are used.