航空遥感相机Ronchi光栅自准直检焦模型分析与验证

刘学吉; 丁亚林; 李锋; 陈志超; 远国勤; 刘志明

doi:10.3788/OPE.20202806.1236

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航空遥感相机Ronchi光栅自准直检焦模型分析与验证

更新时间：2020-07-13

- 航空遥感相机Ronchi光栅自准直检焦模型分析与验证
- Theoretical analysis and verification of Ronchi grating auto-collimated focusing for aerial remote camera
- 光学精密工程 2020年28卷第6期页码：1236-1244
- 作者机构：
  
  1.中国科学院长春光学精密机械与物理研究所中国科学院航空光学成像与测量重点实验室, 吉林长春 130033
  2.空军装备部驻长春地区军事代表室, 吉林长春 130033
- 作者简介：
  
  [ " 刘学吉(1989-), 男, 吉林公主岭人, 硕士, 研究实习员, 2012年于长春理工大学获得学士学位, 2015年于国防科技大学获得硕士学位, 主要从事航空光学成像仿真及光学系统设计等方面的研究。E-mail:lxj3115@163.com" ]
  丁亚林(1964-)，男，吉林长春人，研究员，博士生导师，1987年于吉林工业大学获得学士学位，1994年于东北大学获得硕士学位，主要从事航空遥感仪器光机结构总体技术及载机动态条件下稳定成像技术等方面的研究。E-mail: dingyl1964@sohu.com DING Ya-lin, E-mail: dingyl1964@sohu.com
- 基金信息：
  
  国家自然科学基金资助项目(61675202)
- DOI：10.3788/OPE.20202806.1236
  中图分类号： TH74;V241.01;V248.1
- 收稿日期：2019-12-31，
  
  录用日期：2020-2-26，
  
  纸质出版日期：2020-06-25
- 稿件说明：
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刘学吉, 丁亚林, 李锋, 等. 航空遥感相机Ronchi光栅自准直检焦模型分析与验证[J]. 光学精密工程, 2020,28(6):1236-1244.

Xue-ji LIU, Ya-lin DING, Feng LI, et al. Theoretical analysis and verification of Ronchi grating auto-collimated focusing for aerial remote camera[J]. Optics and precision engineering, 2020, 28(6): 1236-1244.
刘学吉, 丁亚林, 李锋, 等. 航空遥感相机Ronchi光栅自准直检焦模型分析与验证[J]. 光学精密工程, 2020,28(6):1236-1244. DOI： 10.3788/OPE.20202806.1236.

Xue-ji LIU, Ya-lin DING, Feng LI, et al. Theoretical analysis and verification of Ronchi grating auto-collimated focusing for aerial remote camera[J]. Optics and precision engineering, 2020, 28(6): 1236-1244. DOI： 10.3788/OPE.20202806.1236.

摘要

为解决航空遥感相机检焦系统故障分析、元器件选型及提高检焦精度的问题，本文深入研究了基于Ronchi光栅的光电自准直检焦法。首先，归纳总结了国内外航空相机常用的几种检焦方法，对比了每种检焦方法的优缺点。接着，重点介绍了基于Ronchi光栅的光电自准直检焦系统的构成和工作原理，建立了数学模型，模拟了检焦系统在不同像面位置处的输出波形。然后，为衡量离焦程度，提出了离焦评价因子的概念，接着分析了光学系统的衍射效应和像差大小、Ronchi光栅的周期选择及检焦光源的能量分布这三种因素对检焦精度的影响，给出了Ronchi光栅周期的选择方法。最后，通过实验的方法对本文的仿真结果加以验证。实验结果表明：合焦波形的峰峰值占比0.82，对应0.05 mm步长下的平均检焦分辨力约为10%。

Abstract

To address issues such as auto-focusing system fault analysis and component selection

and to improve the focusing accuracy of aerial remote cameras

this article offered insights into the auto-collimated focusing technology based on the Ronchi grating.First

in this paper

several common focusing methods of both domestic and foreign aerial cameras were summarized and compared. Then

the composition and operating principle of optoelectronic auto-collimated focusing systems based on the Ronchi grating were introduced

the mathematical model was established

and the simulation curves of the focusing waveform with different imaging positions were presented. To measure the focal distances

the concept of the defocusing evaluation factor was proposed.Next

the three factors that affect the focusing accuracy of the diffraction effect and the aberration of the optical system

the period selection of the Ronchi grating

and the energy distribution of the light source were analyzed. The influence of the Ronchi grating period selection method was then presented. Finally

the experimental results verify the validity of the simulation results and show that the peak-to-peak ratio of the focusing waveform is 0.82

corresponding to an average focusing detection resolution of 10% at 0.05 mm.

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references

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