Analysis of Resolution Change of the Super Gen.Ⅱ Image Intensifier with Input Illumination Variation
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摘要: 为研究超二代像增强器在不同输入照度下的分辨力变化规律，在不同照度下分别对不同极限分辨力、信噪比以及等效背景照度像增强器的分辨力进行了测试。通过测试数据的分析，得出了极限分辨力、信噪比及等效背景照度在不同照度下对分辨力影响的规律。该规律表明，在5×10－2 lx~5×10－3 lx照度区间，不同性能参数像增强器的分辨力均等于其极限分辨力，并且分辨力不随照度的降低而降低；在5×10－3 lx~5×10－7 lx照度区间，分辨力不等于其极限分辨力，并且分辨力均随照度的降低而降低。在分辨力随照度降低的过程中，信噪比越高，等效背景照度越低的像增强器，其分辨力下降的速率越低，并且分辨力相对更高。在5×10－3 lx~5×10－6 lx照度区间，信噪比对分辨力的影响较大；但在5×10－6 lx~5×10－7 lx照度区间，等效背景照度对分辨力的影响更大。像增强器主要在弱光下使用，因此在弱光下的分辨力更重要。要使像增强器在5×10－3 lx~5×10－7 lx照度区间具有更高的分辨力，除需要提高极限分辨力外，还需要提高信噪比及降低等效背景照度。Abstract: The resolution of image intensifier samples with different limiting resolution, signal-to-noise ratio, and equivalent background illumination were tested under different illuminations to study the variation of the resolution of Super Gen.Ⅱ image intensifier. By analyzing the test data, the influence of limiting resolution, signal-to-noise ratio and equivalent background illumination on resolution under different illuminations were obtained. The results show that in the range of 5×10−2 to 5×10−3 lx, the resolution of the image intensifier with different performance parameters is identical to its limiting resolution, and the resolution does not decrease with decreasing illumination. In the range of 5×10−3 to 5×10−7 lx, the resolution differs from its limiting resolution, and the resolution decreases with decreasing illumination. In the case of resolution decreasing with illumination, the higher the signal-to-noise ratio and the lower the equivalent background illumination, the lower the rate of resolution decrease, and the resolution reamains relatively high. In the illumination range of 5×10−3 to 5×10−6 lx, signal-to-noise ratio has a greater influence on the resolution, whereas in the illumination range of 5×10−6 to 5×10−7 lx, the influence of equivalent background illumination is greater. As the image intensifier is mainly used in low light conditions, the resolution under these conditions is more important. To increase the resolution of the image intensifier in the illumination range of 5×10−3 to 5×10−7 lx, it is necessary to improve the signal-to-noise ratio and reduce the equivalent background illumination as well as the limiting resolution.
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Key words:
- image intensifier /
- resolution /
- signal-to-noise ratio /
- equivalent background illumination /
- contrast
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表 1 试验样品参数
Table 1. Parameters of samples for resolution measurement
Sample G/(cd·m-2·lx-1) Rm/(lp·mm-1) SNR EBI/lx 5327# 15000 64 24.7 1.5×10-7 4525# 15000 57 24.4 1.7×10-7 3533# 15000 64 29.1 1.4×10-7 3445# 15000 64 28.9 0.1×10-7 
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