纹影技术中光源的选择与设计方法  

Design method and selection of light source in schlieren technology

作　　者：叶继飞[1] 金燕[2] 吴文堂[1] 蒋冠雷[1] 

机构地区：[1]装备指挥技术学院基础部,北京101416 [2]装备指挥技术学院士官系,北京102249

出　　处：《实验流体力学》2011年第4期94-98,共5页Journal of Experiments in Fluid Mechanics

基　　金：国家自然科学基金项目(90916015)

摘　　要：在纹影技术应用过程中,纹影光源的性能一定程度上决定了拍摄结果的优劣。不同种类的光源,得到的拍摄效果不同,对于某种特定拍摄需求,光源的选择和设计也不同。如何选择和设计合适的纹影光源,对于最终拍摄结果的好坏至关重要。结合纹影技术在工程实际中的应用,分析了不同被测对象对光源的需求,总结了几种常见光源的应用情况及其特点,提供了一种光源参数设计的方法。在实验室典型超声速自由射流流场测量中,对卤钨灯、氙灯和激光3种纹影光源的应用进行了对比分析。所提出的纹影光源的选择与设计方法,具有一定的工程实验参考价值。In the schlieren technology,the performance of light source exerts a great influence on the photography result. Different photograph results could be obtained with different kinds of light sources. Based on certain kind of measurement demand, the design and selection of light source should be considered specially. In the application of schlieren technology to practical meas- urement,the light source demand is analyzed for different measurement objects. The application characteristics are summarized for several kinds of schlieren light sources. A design method of light source parameters is presented. Supersonic free jet is measured and analyzed by the schlieren system with three kinds of light sources, tungsten-halogen lamp, xenon lamp and laser. This work could provide reference for the schlieren experiment design.

关 键 词：纹影 光源 曝光量 高速相机 自由射流 

分 类 号：O439[机械工程—光学工程]