| 衍射光学系统红外光谱目标探测性能 |
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| 引用本文： | 周凯,李道京,王烨菲,姚园,乔明.衍射光学系统红外光谱目标探测性能[J].红外与激光工程,2021,50(8):20200371-1-20200371-8. |
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| 作者姓名： | 周凯 李道京 王烨菲 姚园 乔明 |
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| 作者单位： | 1.中国科学院空天信息创新研究院 微波成像技术国家级重点实验室，北京 100190 |
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| 基金项目： | 中国科学院重点项目（E03701010F） |
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| 摘 要： | 衍射光学系统具有大口径轻量化的优点，但其光谱范围较窄，能利用的红外信号能量较小，通常认为采用后会使红外相机的探测信噪比降低。基于衍射光学系统，分析了对地观测红外相机的目标探测性能，结合一个非制冷红外相机信噪比计算示例，明确了在地物背景和目标光谱特性不同的条件下，基于衍射光学系统的红外相机仍可能具有良好的目标探测性能。同时将红外相机等效噪声功率与激光和电子学系统进行对比，提出了红外探测系统的性能还可能进一步提高的观点，给出了一种引入激光本振结合电子学滤波细分红外光谱降低等效噪声功率的方法。
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| 关 键 词： | 红外探测 衍射光学系统 信噪比 等效噪声功率 光谱特性 激光本振 |
| 收稿时间： | 2020-12-17 |
Target detection performance of infrared spectrum with diffractive optical system |
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| Affiliation: | 1.National Key Laboratory of Microwave Imaging Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China2.University of Chinese Academy of Sciences, Beijing 100049, China3.Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China |
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| Abstract: | The diffractive optical system has the advantages of large diameter and light weight, but its spectral range is narrow and the infrared signal energy that can be used is small. Therefore, it is generally believed that the detection signal to noise ratio (SNR) of the infrared camera will be reduced when it is adopted. Based on the diffractive optical system, the target detection performance of the ground observation infrared camera was analyzed, combined with an example of the calculation of the SNR of the uncooled infrared camera, the viewpoint that infrared cameras based on diffractive optical systems may still have good target detection performance was clarified when the spectral characteristics of ground object background and target were different. Meanwhile, the equivalent noise power of the infrared camera was compared with the laser and the electronic system. As a conclusion, the viewpoint that the performance of the infrared detection system may be further improved was proposed, and a method of introducing the laser local oscillator combined with the electronic filter which can subdivide infrared spectrum to reduce equivalent noise power was given. |
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