基于参量下转换自校准辐射基准源原理样机的光机设计

Opto-mechanical Design of Self-calibraiton Radiometric Reference Source Prototype Based on Spontaneous Parametric Down-conversion

为满足全球气候观测、定量化遥感等超高精度定标需求,研制了基于参量下转换自校准辐射基准源原理样机,设计时充分考虑原理样机模块化、轻量化与集成化.对探测器模块关键部位结构进行静力学分析,结果显示由零件形变导致探测器光敏面位置偏移21μm,探测器光敏面直径为180μm,透镜聚焦的光子光斑直径为16μm,光斑可全部进入探测器光敏面,满足设计需求.用微光相机观察各探测器前光子光斑,结果显示光斑形状规则、大小完整,用单光子探测器采集相关光子,通过符合测量绘制出八通道四对相关光子符合峰,验证了原理样机整机结构设计达到设计目标.

In order to meet the requirements of ultra-high precision calibration for global climate observation and quantitative remote sensing,a prototype system based on spontaneous parametric down-conversion self-calibration radiation reference source was developed.The design was fully considered to be modular,lightweight and integrated.The static analysis of the key part of the detector module showed that the position of the detector's photosensitive surface was shifted by 21 μm,the photosensitive surface of the detector was 180 μm,and the diameter of the photon spot of the lens was 16 μm.The spot could be fully detected,which met the design requirements.A low-light camera was used to observe the photon spots in front of each detector,the results showed that the spot shape was regular and the size was complete.The single photon detector was used to collect the relevant photons.The eight-channel four-pair correlated photon matching peaks were drawn by the coincidence measurement,and the principle was verified.The machine structure was well designed to meet the design goals.