低温真空红外傅里叶光谱仪噪声等效辐亮度定标系统

红外傅里叶光谱的等效噪声辐亮度(NESR)是反映其对红外目标信号的极限探测能力, 也是仪器的主要技术指标。受限于我国当前的技术条件, 尚无相关能力的测试定标系统和检定规范。通过借鉴当前国内外的红外辐射计量装置的标准传递思路, 提出了一种NESR高精度测试装置方案。给出了该装置的溯源链路, 描述了其整体和光路结构, 并设计了低温真空背景抑制模块。着重介绍了宽动态范围红外积分球辐射源设计、等效光路设计和真空低温环境模块等设计方案。提出的设计方案为NESR高精度测量提供基本的参考依据, 为我国傅里叶光谱的NESR的量值溯源提供支撑条件。

Abstract

The equivalent noise radiance (NESR) of infrared Fourier spectrometer is not only a reflection of its ultimate detection ability to infrared target signal, but also a core technical index of instrument. Limited by the current technical conditions in China, there is no relevant capability of calibration system testing and specification verification yet. Based on the standard transmission method of infrared radiation metering devices at home and abroad, a scheme of NESR high-precision testing device was proposed. The traceability chain of this device was put forward, its overall structure and optical path were also described, while a suppression system with low-temperature and vacuum background was designed. This designing scheme of radiation source on infrared integrating sphere with wide dynamic range, equivalent optical path and vacuum cryogenic environment were introduced in detail. The proposed technical solution provides a basic reference for NESR high-precision measurement, which also supports the condition of NESR quantity traceability for Fourier spectrometer in China.

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黄思佳, 夏茂鹏, 李健军, 郑小兵, 雷正刚. 低温真空红外傅里叶光谱仪噪声等效辐亮度定标系统[J]. 应用光学, 2019, 40(6): 1103. HANG Sijia, XIA Maopeng, LI Jianjun, ZHENG Xiaobing, LEI Zhenggang. Noise equivalent radiance calibration system for infrared Fourier spectrometer at low-temperature and vacuum environment[J]. Journal of Applied Optics, 2019, 40(6): 1103.

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