光学学报, 2016, 36 (11): 1130001, 网络出版: 2016-11-08   

双通道自校准光谱辐射源光电探测效率的定标

Photoelectric Detection Efficiency Calibration of Double Channel Self-Calibration Radiation Reference Source
作者单位
1 中国科学院安徽光学精密机械研究所通用光学定标与表征技术重点实验室, 安徽 合肥 230031
2 中国科学技术大学, 安徽 合肥 230031
摘要
基于相关光子的新定标技术,设计了一种自校准光谱辐射源原理样机,该原理样机兼有自校准和目标观测功能,其中观测通道光电探测效率的精确测量是目标观测精度的有效保证。搭建了两通道自校准光谱辐射源原理样机,通过相关光子定标原理实验测量了观测通道的光电探测效率,其测量不确定度优于0.35%。自校准光谱辐射源能够对观测通道的光电探测效率进行实时自校准,观测通道中的任一光学元件透射率的变化不会影响目标的辐亮度测量精度。在待定标通道探测器之前插入一片衰减片来模拟观测通道光电探测效率的改变,以及自校准光谱辐射源对观测通道衰变的敏感度。通过测量插入衰减片前后的光子计数或者符合计数,计算得到衰减片的实际透射率为20.12%,与插入衰减片前后观测通道光电探测效率20.11%的变化率一致, 两者相对偏差优于0.049%。实验结果表明,自校准机制下光谱辐射源能够精确监测观测通道光电探测效率的衰变情况。验证了自校准光谱辐射源设计的合理性与可行性,为后续的多通道自校准光谱辐射源原理样机的研制及辐射定标提供技术基础。
Abstract
Based on new calibration technique of photon correlation, a prototype of self-calibration radiation reference source (SRRS) is designed. This prototype combines the self-calibration and observation target function. The precision of observation for target can be guaranteed by accurate measurement of detection efficiency in observation channel. A two-channel self-calibration spectral radiation prototype is established, and the photoelectric detection efficiency of observation channel is measured through the principle of correlated photon calibration. The measurement uncertainty of 0.35% for detection efficiency is obtained. SRRS can realize self-calibration for photoelectric detection efficiency of observation channel. Transmittance changes of any optical element in the observation channel don′t affect the measurement accuracy of radiance of the objectives. An attenuator is inserted into the observation channel to simulate the sight path photoelectric detection efficiency changes, so as to verify the sensitivity of calibration spectra from the radiation source on the decay of the observation channel. By measuring the photo count or coincidence count before and after inserting the photon attenuation, the actual transmittance of 20.12% of the attenuator is calculated, and it is in accordance with the change rate (20.11%) of the photoelectric detection efficiency for observation channel before and after inserting the attenuator. The relative deviation between the two is less than 0.049%. Experimental results show that the radiation spectrum from the self-calibration mechanism can accurately monitor the decay of observation channel photoelectric detection efficiency. Rationality and feasibility of the SRRS design are preliminarily verified, which provides the technical basis for subsequent multi-channel self-calibration spectral radiation prototype development and calibration of radiation.

高冬阳, 胡友勃, 刘岩, 郭园园, 夏茂鹏, 李健军, 郑小兵. 双通道自校准光谱辐射源光电探测效率的定标[J]. 光学学报, 2016, 36(11): 1130001. Gao Dongyang, Hu Youbo, Liu Yan, Guo Yuanyuan, Xia Maopeng, Li Jianjun, Zheng Xiaobing. Photoelectric Detection Efficiency Calibration of Double Channel Self-Calibration Radiation Reference Source[J]. Acta Optica Sinica, 2016, 36(11): 1130001.

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