Measurement of modulation transfer function for IR imaging system

LI Hang; YAN Chang-xiang; YU Ping; SHAO Jian-bing

doi:10.3788/OPE.20162404.0698

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Measurement of modulation transfer function for IR imaging system

更新时间：2020-08-13

- Measurement of modulation transfer function for IR imaging system
- Optics and Precision Engineering Vol. 24, Issue 4, Pages: 698-708(2016)
- 作者机构：
  
  1. 中国科学院长春光学精密机械与物理研究所,吉林长春,中国,130033
  2. 中国科学院大学北京,中国,100049
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20162404.0698
  CLC： TN216
- Received：06 August 2015，
  
  Revised：06 October 2015，
  
  Published：25 April 2016
- 稿件说明：
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李航, 颜昌翔, 于平等. 红外成像系统的调制传递函数测试[J]. 光学精密工程, 2016,24(4): 698-708

LI Hang, YAN Chang-xiang, YU Ping etc. Measurement of modulation transfer function for IR imaging system[J]. Editorial Office of Optics and Precision Engineering, 2016,24(4): 698-708
李航, 颜昌翔, 于平等. 红外成像系统的调制传递函数测试[J]. 光学精密工程, 2016,24(4): 698-708 DOI： 10.3788/OPE.20162404.0698.

LI Hang, YAN Chang-xiang, YU Ping etc. Measurement of modulation transfer function for IR imaging system[J]. Editorial Office of Optics and Precision Engineering, 2016,24(4): 698-708 DOI： 10.3788/OPE.20162404.0698.

摘要

研究了刃边法测试光学系统调制传递函数(MTF)的原理

提出将改进倾斜刃边法用于红外成像系统MTF的测量。考虑刃边倾斜角度的测量误差和噪声干扰会引起红外系统MTF的测量误差

采用Canny算子、直线拟合和边缘扩散函数(ESF)重构行数变动等方法来提高MTF的测试精度;同时针对ESF与线扩散函数(LSF)提出有效的降噪算法来降低噪声对MTF测试精度的影响

从而系统地降低了MTF的测量误差。搭建了实验平台

以红外成像系统的理论模型和实测参数得到的MTF曲线为依据

实验验证了本文方法的有效性

测试分析了刃边倾角的变化对MTF测试精度的影响。实验结果表明:通过本文方法测试得到的MTF曲线的测试精度为0.010

测试重复精度为0.008

刃边倾角保持在2°~10°。实验结果显示:本文方法有效地降低了刃边倾角的测量误差和噪声干扰对MTF测试产生的影响

测试结果具有良好的重复性。

Abstract

The principles of optical Modulation Transfer Function(MTF) measurement by the edge method for an optical system were researched and an improved inclined edge method for the MTF measurement of an infrared imaging system was proposed. As the edge angle measurement error and noise will cause the MTF measurement error of the infrared system

the Canny operator

line fitting and Edge Spread Function (ESF) reconstruction row number changes were combined to improve the measuring accuracy of the MTF

meanwhile

an effective denoise algorithm for the ESF and the Line Spread Function (LSF)was used to reduce the effect of noise on the MTF measuring accuracy.With the methods mentioned above

the measurement errors of MTF were reduced systematically. An experimental platform was set up. Based on the theoretical model of infrared imaging system and MTF curve obtained by detected parameters

the feasibility of the proposed method was verified and the effect of changed edge angle on the MFT measuring accuracy was analyzed. Experimental results show that the measurement accuracy of MTF curve obtained by the method is 0.010

the measuring repeat accuracy is 0.008

and the edge angle should be kept between 2 ånd 10 °. It concludes that the method effectively reduces the influences of the edge angle measurement error and noise on the MTF measurement

and the measuring results show good measurement repeatability.

关键词

Keywords

references

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