光学精密工程2012，Vol.20Issue(4)：733-738,6.DOI:10.3788/OPE.20122004.0733
光子计数法测量类针孔成像光斑照度
Illuminance measurement of quasi-point source with photon counting method
摘要
Abstract
To improve the measuring accuracy of Signal to Noise Ratio(SNR) of the third-generation low level image intensifiers, a transient low light level illuminometer was designed based on photon counting principles to measure the illuminance value of 1. 08X×CF-4 lx from a circular area with diameter of 0. 2 mm for the quasi-point imaging source on a photocathode. Firstly, the photon distributing probability and fluctuated deviation were analyzed for the quasi-point light source at a color temperature of 2 856 K, and the average photon flux was calculated. Then, the low light level illuminance measuring principle by the photon counting method was studied according to the photon flux and imaging characteristics. Finally, the composition of the transient quasi-point low light level illuminometer was introduced, and the SNR of a third-generation low light level image intensifier was measured. Experimentalresults indicate that the illuminance deviation and uncertainty of the SNR are 0. 4% and 5. 0%, respectively. It concludes that the proposed low light level illuminometer based on photon counting can effectively improve the accuracy of illuminance measurement for quasi-point low level light sources.关键词
弱光照度/光子计数/类针孔光斑/像增强器Key words
low light level illuminance/photon counting/quasi-point source/image intensifier分类
信息技术与安全科学引用本文复制引用
崔东旭,史继芳,李宏光,孙宇楠,曹锋..光子计数法测量类针孔成像光斑照度[J].光学精密工程,2012,20(4):733-738,6.基金项目
微光夜视技术国防科技重点实验室基金资助项目(No.J20110509) （No.J20110509）
