LLL image intensifier of the third generation SNR measurement technology
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摘要: 微光像增强器是微光成像技术中的核心部件,微光像增强器的信噪比是像增强器的重要参数之一,它可以定量表征像增强器在探测弱辐射图像时的性能,可综合反映空间因素和时间因素对探测图像特性的影响。介绍了微光像增强器信噪比的测量原理和装置，测量装置采用精确的微孔光阑、可变光阑及共轭对称透镜系统，实现直径为0.2 mm的特定光斑投射在像增强器光阴极面上。采用光子计数技术，通过研究小探测面（探测直径小于4 mm）微弱光照度标定方法，解决了针孔微弱光照度的准确标定与直径为0.2 mm信噪比光源照度准确测量。Abstract: Low-light-leve (LLL) image intensifier is the core component of LLL imaging technology, signal-to-noise ratio(SNR) of image intensifier is one of the important parameters of image intensifier, which is quantitative characterization of image intensifier performance in the detection of weak radiation image, and can reflect the influences of space factor and time factors on the detection of image features. SNR measurement principle and devices of LLL image intensifier were introduced. The measurement device adopted precise microporous grating, variable grating and conjugate symmetric lens system, and could realize that a diameter of 0.2 mm particular spot projected onto the cathode surface of image intensifier. Adopting photon counting technology, by studying the weak light intensity calibration method on small detection surface (probe diameter less than 4 mm), the accurate calibration of pinhole weak illumination and the accurate measurement of light source illumination SNR with diameter of 0.2 mm were solved.
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Keywords:
- LLL image intensifier /
- SNR /
- measuring device /
- weak illumination
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