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Uniformity analysis of focal plane efficiency of the Multi-Channel Photometric Survey Telescope (Mephisto)
Han ZJ(韩子健); Yuan XY(袁祥岩); Li ZY(李正阳); Wang JF(王晋峰); Tian J(田杰); Huang Y(黄亚)
2022-08-29
Conference NameSPIE Astronomical Telescopes + Instrumentation
Source PublicationSPIE Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V
Volume12188
Conference Date2022-8-29
Conference PlaceMontréal, Québec, Canada
Abstract

The Multi-Channel Photometric Survey Telescope(Mephisto)is a wide-field ground-based telescope with a 1.6 m primary mirror and 2◦field of view(FOV).The telescope is capable of synchronous photometric imaging in blue,yellow,and red channels covering a wavelength range from 320 nm to 1000 nm by using large cubic splitters with dichroic coatings.A high-accuracy photometric survey requires higher requirements for the transmittance and reflectance of dichroic coatings.However,the light ray incident angle on the cubic splitter surface is 45◦±6 ◦, and the refractive index difference between the p-component and s-component of incident light causes an obvious p/s efficiency difference of both the reflection and transmission through the cubic,which will introduce extra error on the photometric accuracy.This paper proposes an effective method to calculate the uniformity of the imaging efficiency of the Mephisto.By sampling on the pupil plane with each FOV,the efficiency of each light ray can be calculated by the curve fitting method.The efficiency difference over the full focal plane is less than 2.5%,1.5%,and 0.5%for the blue channel,yellow channel,and red channel respectively,introduced by the cube dichroic coatings and the filters,which can be used for the calibration.The method paves the way to solve coating uniformity for large aperture telescopes.

KeywordTelescopes Coating,Photometric efficiency Multi-channel survey
Subject Area天文技术与方法
Document Type会议论文
Identifierhttp://ir.niaot.ac.cn/handle/114a32/2019
Collection会议论文
中国科学院南京天文光学技术研究所知识成果
Affiliation南京天文光学技术研究所
Recommended Citation
GB/T 7714
Han ZJ,Yuan XY,Li ZY,et al. Uniformity analysis of focal plane efficiency of the Multi-Channel Photometric Survey Telescope (Mephisto)[C],2022.
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