用剪切干涉法测气动窗口流场对光束质量的影响
Shearing interferometric investigation on degradation of light beam quality by the aerodynamic window's flow field
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摘要: 利用横向剪切干涉仪对测量环境要求不高的优点，提出用横向剪切干涉仪测量气动窗口流场对光束质量的影响；给出测量原理，解决了干涉条纹难以判读的难点。并对稳定工作状态下自由旋涡气动窗口流场对光束质量的影响进行实验研究。以斯特列尔比为评价标准，测量给出自由旋涡气动窗口在稳定工作状态下对光束质量的影响程度。结果表明，当自由旋涡气动窗口工作在理论设计条件下时，对光束质量的影响比较小，能较好满足任务需要。Abstract: Shearing interferometer is used to investigate the degradation of light beam quality caused by the aerodynamic window's flow field. The principle of investigation is described. The problem of fringe patterns analyzing is solved. In the experiment, the degradation of light beam quality which is caused by the free-vortex aerodynamic window's flow field working in steady states is investigated.
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Key words:
- shear interferometer /
- aerodynamic window /
- digital image processing /
- strehl ratio
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