机匣视窗折射对LDV聚焦的影响分析

赵军; 刘宝杰; 刘火星

机匣视窗折射对LDV聚焦的影响分析

北京航空航天大学能源与动力工程学院, 北京 100083

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出版历程
- 收稿日期: 2006-05-18
- 修回日期: 2006-10-25
- 刊出日期: 2007-07-28

Analysis of beam refraction effects in laser doppler velocimetry

School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

摘要

摘要: 为了分析激光束经过机匣视窗后聚焦状态的变化情况, 发展了一套通用程序, 可用于计算不同的测量条件下, 激光束穿过不同尺寸机匣视窗时的折射情况, 并对其结果的可信性进行了验证.利用所发展的程序, 以二维LDV探头为例, 分析了典型情况下蓝光、绿光焦点偏移情况, 以及蓝光与绿光焦点之间偏移量的变化情况, 并给出了确定焦点重合的计算准则.计算结果表明:如果不进行特殊的光学修正, LDV测量时必须要选取小的探头角度和浅的测点深度.
- 航空、航天推进系统 /
- 折射效应 /
- 激光多普勒测速 /
- 压气机测量
Abstract: A general mathematical program is developed in the paper to analyze the change of focus status after laser beams refracted at curved surface and to consider the displacement of focuses caused by refraction with various dimensions of window and various optical parameters.The creditability of the program has been validated and the associated parameters have been reviewed.The analyses of displacement of focus of blue beams,displacement of focus of green beams,and displacement between focus of green beams and focus of blue beams have been conducted in the case of two-dimensional laser doppler velocimetry(LDV) system,while a calculation criterion was presented to determine the superposition of focuses.The results demonstrated that small probe angle and shallow object depth should be essential in the case of lack of special optical correction.
- aerospace propulsion system /
- refraction effect /
- laser doppler velocimetry(LDV) /
- compressor measurements

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参考文献(6)

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