散焦光栅测量光束漂移的光路设计仿真

高国昌; 龙超; 司磊; 景春元

散焦光栅测量光束漂移的光路设计仿真

高国昌^1,2, ,,
龙超²,
司磊¹,
景春元²

1.
国防科学技术大学光电技术学院,湖南长沙 410073;
2.
西北核技术研究所,陕西西安 710024

详细信息

通讯作者:
高国昌（1982-），男，江苏睢宁人，硕士研究生，主要从事光电测量技术研究工作。 Email:gady2010@163.com

中图分类号: TN929.1
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出版历程
- 刊出日期: 2013-03-15

Simulation and design of beam drift measurement with defocus grating

1.
College of Opto-Electronic Science and Engineering,National University of Defense Technology,Changsha 410073,China;
2.
Northwest Institute of Nuclear Technology,Xi-an 710024,China

摘要

摘要: 传统的光束漂移量测量系统利用近、远场测量设备分别测量光束的平漂量和角漂量，结构复杂、实时性低。散焦光栅焦平面处正、负一级衍射斑的位置变化可同时反映光束的平漂量和角漂量，为验证该理论、搭建简化的测量系统需要对光路设计进行仿真。基于散焦光栅的成像机理，利用Matlab软件构建了光束通过散焦光栅的成像模型，仿真结果与理论分析一致；最后对光栅和透镜等不同光路设计参数与最大漂移量测量幅值的关系进行了模拟。结果表明，在成像单元约1 cm2、短焦透镜焦距约12 cm的条件下，为实现漂移量测量精度和可测幅度的最大化，散焦光栅需要离轴15 mm，散焦光栅与短焦透镜的焦距比为6。
- 散焦光栅 /
- 光束漂移测量 /
- 仿真分析
Abstract: Tradition systems of beam drift measurement always need measuring at near field and far field respectively, so they are complex and non-real time. A new theory of drift measurement based on the location change of diffraction spot was proposed, which was not applied. For verifying the theory and building a predigested measurement system, the design of the key elements needed to be simulated. Based on the imaging theory of defocus grating, the model of beam transmission was built by Matlab. The simulation result was consistent with the theory. Finally, the relation between the key parameters of the grating and the maximum drift value was simulated and analyzed. The Results shows that the best design parameters can be obtained while the off-axis value of defocus grating is 15 mm and the focus length ratio of defocus grating to short focus lens is 6 under the condition of the imaging unit 1 cm2 and the focus of short lens 12 cm.
- defocus grating /
- beam drift measurement /
- simulation and analysis

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参考文献(1)

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