Design of varying f/number of cooled infrared detectors based on spherical reflecting warm shield

	Design of varying f/number of cooled infrared detectors based on spherical reflecting warm shield
	Chang, S. T.; Q. J. Tian; F. Y. He; Y. Yu and Z. Li
	2017
发表期刊	Acta Physica Sinica
卷号	66 期号:15
摘要	As is well known, the f/number of a cooled infrared detector is determined by the aperture and position of the internal cold shield. Moreover, the f/number can be changed by inserting a warm shield in front of the detector. In order to reduce the stray radiation introduced by an ordinary planar warm shield, we propose a method of varying f/number of the infrared detector based on a well-designed spherical reflecting warm shield in this paper. First, an infrared radiation model is established in order to analyze the influence of the stray radiation introduced by the ordinary planar warm shield. Then the design principle of the spherical reflecting warm shield is put forward. By changing the surface shape and emission characteristics, the stray radiation introduced by the ordinary planar warm shield can be obviously reduced. Hence it is beneficial to maintain the performance of the detector effectively while the f/number is changed. To validate the proposed method, a spherical reflecting warm shield and an ordinary planar warm shield are designed to vary the f/number of a cooled infrared detector respectively. To compare the influences of the two warm shields on the cooled infrared detector, radiometric calibration experiments are conducted in a high-low-temperature test chamber. The analyses and experimental results show that the stray radiation of spherical reflecting warm shield is far less than that of the ordinary planar warm shield. Moreover, the noise equivalent temperature difference introduced by the designed spherical reflecting warm shield is lower. Therefore it is indeed better than an ordinary planar warm shield in ensuring the performance of an infrared imaging system.
收录类别	sci ; ei
语种	中文
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/58843
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Chang, S. T.,Q. J. Tian,F. Y. He,et al. Design of varying f/number of cooled infrared detectors based on spherical reflecting warm shield[J]. Acta Physica Sinica,2017,66(15).
APA	Chang, S. T.,Q. J. Tian,F. Y. He,&Y. Yu and Z. Li.(2017).Design of varying f/number of cooled infrared detectors based on spherical reflecting warm shield.Acta Physica Sinica,66(15).
MLA	Chang, S. T.,et al."Design of varying f/number of cooled infrared detectors based on spherical reflecting warm shield".Acta Physica Sinica 66.15(2017).

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