光学学报, 2018, 38(9): 0901002, 网络出版: 2019-05-09

大气校正仪短波红外通道内部杂散辐射测量方法

Measurement Method of Internal Stray Radiation in Short-Wave Infrared Channel of Atmospheric Corrector
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230026

摘要
成像区域大气校正仪内部杂散辐射抑制水平是光学设计以及性能评估的一项重要指标,尤其针对红外波段的光学系统,其内部的杂散辐射不可忽略。提出了一种基于辐射定标的方法,用于测量仪器内部的杂散辐射。通过控制变量得到仪器输入与输出之间的线性关系,建立辐射定标的模型,用实验的方法测量了仪器在不同环境温度下的本底信号值,并与理论计算的内部杂散辐射相比较,最大偏差为4.45%,验证了该方法的有效性。利用该方法可以计算大气校正仪在不同环境温度以及不同增益下的杂散辐射,不仅简化了实验过程,也可以对大气校正仪内部杂散辐射指标进行评估。
Abstract
The suppression level of internal stray radiation of atmospheric corrector in short-wave is a key indicator for its optical design and performance evaluation, especially for infrared optical systems, in which the internal stray radiation cannot be ignored. In order to measure the output of the stray radiation inside the instrument, a method based on radiation calibration is proposed. First, we obtain the linear relationship between the input and output of the instrument by controlling variables, and the model of the radiation calibration is established. Then, the background signal of the instrument at different ambient temperatures is measured, and a maximum deviation of 4.45% is found compared to theoretical values, which verifies that the calibration model is valid. The proposed method can be used to calculate the internal stray radiation correction of atmospheric corrector at different ambient temperatures and gain values, which simplifies experimental processes and evaluates the stray radiation index of the atmospheric corrector.
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