Schlieren成像和声场可视化  

Schlieren imaging and visualization of acoustic field

作　　者：钱梦騄[1] 姜学平[1] 程茜[1] 

机构地区：[1]同济大学声学研究所,上海200092

出　　处：《应用声学》2013年第1期1-9,共9页Journal of Applied Acoustics

基　　金：国家自然科学基金项目(10834009和11274342)

摘　　要：Schlieren技术是利用声场引起透明媒质光折射率的变化而实现声场可视化的光学成像技术。它具有对声场无干扰、快速、瞬态成像的特点。本文利用二维光学Fourier变换分析了Schlieren技术的成像原理,在采用连续激光和高速ICCD的Schlieren成像系统中,实验研究了平面波声场和线聚焦声场中换能器光学校准方法和声压的定量检测技术。发展声场瞬态和动态成像技术,观测了声波的聚焦过程和固-液界面的声场分布和变化。这些结果表明Schlieren技术是一种有效的声场可视化和定量检测的光学成像技术。Schlieren method is an optical imaging technique that is based on the change of optical refractive index in transparent medium produced by acoustic field. The main features of Schlieren method are imaging fast and not interference in acoustic field. According to two dimension （2D） optical Fourier transform the image principle of Schlieren method is introduced. An experimental Schlieren system, which consists of continuous wave （CW） Laser and Intensification Charge-Coupled Device （ICCD） camera, is set up, and the optical testing method of transducer emitting response and acoustic pressure in a plane wave field is studied. The transient Schlieren images of acoustic field are obtained and the focusing acoustic field and the acoustic field on the solid-liquid interface are observed. These results show that Schlieren method is an effective optical technique for quantitative testing and visualization of acoustic field.

关 键 词：Schlieren技术 Fourier光学变换 声换能器校准 声场可视化 

分 类 号：O426[理学—声学]