直接测距型无扫描激光主动成像验证系统

徐正平; 沈宏海; 姚园; 李刚; 宋玉龙; 李海星; 孙翯; 石磊

doi:10.3788/OPE.20162402.0251

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直接测距型无扫描激光主动成像验证系统

现代应用光学 | 更新时间：2020-08-13

- 直接测距型无扫描激光主动成像验证系统
- Scannerless laser active imaging validating system by directly ranging
- 光学精密工程 2016年24卷第2期页码：251-259
- 作者机构：
  
  中国科学院长春光学精密机械与物理研究所航空光学成像与测量重点实验室, 吉林长春 130033
- 作者简介：
- 基金信息：
  
  中国科学院国防科技创新基金资助项目(No.CXJJ-14-S123)();吉林省科技发展计划资助项目(No.20150204022GX).()
- DOI：10.3788/OPE.20162402.0251
  中图分类号： P225.2;TN249
- 收稿日期：2015-07-13，
  
  修回日期：2015-09-08，
  
  纸质出版日期：2016-02-25
- 稿件说明：
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徐正平, 沈宏海, 姚园等. 直接测距型无扫描激光主动成像验证系统[J]. 光学精密工程, 2016,24(2): 251-259

XU Zheng-ping, SHEN Hong-hai, YAO Yuan etc. Scannerless laser active imaging validating system by directly ranging[J]. Editorial Office of Optics and Precision Engineering, 2016,24(2): 251-259
徐正平, 沈宏海, 姚园等. 直接测距型无扫描激光主动成像验证系统[J]. 光学精密工程, 2016,24(2): 251-259 DOI： 10.3788/OPE.20162402.0251.

XU Zheng-ping, SHEN Hong-hai, YAO Yuan etc. Scannerless laser active imaging validating system by directly ranging[J]. Editorial Office of Optics and Precision Engineering, 2016,24(2): 251-259 DOI： 10.3788/OPE.20162402.0251.

摘要

为提高成像效率

研究了基于雪崩光电二极管(APD)阵列和分束照明的直接测距型无扫描激光主动成像系统。系统采用脉冲激光器作为光源

通过测量激光脉冲飞行时间来获取目标距离信息;基于达曼光栅进行分束照明以提高能量利用率。另外

光学系统采用收发共孔径结构

保证了目标处激光脚点和APD阵列各像元的几何对准。与参考APD所采用固定阈值时刻鉴别法不同

系统采用固定阈值与恒比定时相结合的时刻鉴别法处理回波APD阵列的输出信号以适应外光路参数的变化。各通道采用专用计时芯片TDC-GP22测量启停脉冲之间的时间间隔

实现了45 ps的计时分辨率。最后

将19 m和31 m处放置的两个角反射器作为合作目标进行了成像实验

并给出了所获取的距离图像。结果表明:两个目标的平均距离分别为19.28 m和31.54 m

测距误差分别为0.28 m和0.54 m

显示提出的设计方案切实可行。

Abstract

To enhance imaging efficiency

a scannerless laser active imaging system by directly ranging was explored on the basis of an Avalanche Photo Diode(APD) array and a splitting beam illuminating method. A pulse laser was selected to be a light source

and the distant information of a target was obtained by measuring the time-of-flight of laser. A Dammann grating was used for illuminating by splitting beams to improve the usage efficiency of laser energy. Furthermore

a transceiving optical system with a common aperture was adapted to ensure the geometrical alignment between laser foot-prints and pixels of the APD array. Different from the constant threshold discriminator used in reference APD

a time discrimination method in combination of the constant threshold discriminator and the constant fraction discriminator was used to process the echo signal from APD array and to adapt the parametric variation of optical path. Moreover

dedicated time-detecting chip TDC-GP22 was used for each channel to test the interval between starting and stopping pulses

and to obtain the timing resolution of 45 ps.At last

an imaging experiment was conducted by choosing two corner reflectors respectively located in the distance of 19 m and 31 m as cooperative targets and the distant images were given. Result shows that the average distances of the two targets are 19.28 m and 31.54 m

respectively

and the distant errors are 0.28 m and 0.54 m. It concludes that the optical system and design method proposed are feasibility.

关键词

Keywords

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