Illuminance measurement of quasi-point source with photon counting method

CUI Dong-xu; SHI Ji-fang; LI Hong-guang; SUN Yu-nan; CAO Feng

doi:10.3788/OPE.20122004.0733

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Illuminance measurement of quasi-point source with photon counting method

Article | 更新时间：2020-08-12

- Illuminance measurement of quasi-point source with photon counting method
- Optics and Precision Engineering Vol. 20, Issue 4, Pages: 733-738(2012)
- 作者机构：
  
  1. 西安应用光学研究所,陕西西安,710065
  2. 南京理工大学电子工程与光电技术学院,江苏南京,210094
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20122004.0733
  CLC： TN144
- Received：31 December 2011，
  
  Revised：22 February 2012，
  
  Published Online：22 April 2012，
  
  Published：22 April 2012
- 稿件说明：
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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,(4): 733-738

CUI Dong-xu, SHI Ji-fang, LI Hong-guang, SUN Yu-nan, CAO Feng. Illuminance measurement of quasi-point source with photon counting method[J]. Editorial Office of Optics and Precision Engineering, 2012,(4): 733-738
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,(4): 733-738 DOI： 10.3788/OPE.20122004.0733.

CUI Dong-xu, SHI Ji-fang, LI Hong-guang, SUN Yu-nan, CAO Feng. Illuminance measurement of quasi-point source with photon counting method[J]. Editorial Office of Optics and Precision Engineering, 2012,(4): 733-738 DOI： 10.3788/OPE.20122004.0733.

摘要

为了精确测量三代微光像增强器的信噪比

采用光子计数法研制了瞬态类针孔弱光照度计来实现微光像增强器阴极面上

0.2 mm类针孔成像光斑的1.0810

-4

lx照度测量。首先

分析了色温为2 856 K的光源形成的类针孔弱光光斑的光子分布概率及光子数涨落偏差等光子统计特性

计算了平均光子通量。然后

针对类针孔弱光光斑的光子通量特点及成像特性

研究了光子计数法测量弱光照度原理。最后

介绍了瞬态类针孔弱光照度计的组成及测量方法。对三代微光像增强器的信噪比进行了测量实验

结果显示:三代微光像增强器信噪比测量装置的照度测量偏差为0.4%

像增强器信噪比测量不确定度为5.0%

表明基于光子计数法研制的瞬态类针孔弱光照度计有效提高了类针孔光斑极弱照度测量的准确度。

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 1.08?10

-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. Experimental results 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.

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references

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