Density measurement for stratified fluid usinggrating Schlieren method
A simple density measurement system for stratified fluid is proposed, which utilizes a grating in a traditional Schlieren system to transform the light ray deflection caused by the density variation of a flow field into the deformation of fringe pattern formed by the grating projection. The density information of the flow field can be then extracted from the deformed fringe pattern. The system proposed is simple in setup and easy to adjust, and has a large measurement range. For fringe pattern analysis, wavelet transform phase extraction method is applied. Noise effect and invalid data can be effectively eliminated through the choice of optimized analyzing wavelet and form of wavelet transform, and the phase analyzing precision can be thus improved.
Ronchi grating Schlieren method wavelet analysis phase eztraction
Zhang Mingzhao Wang Boxiong Ren Qian Guo Xiaoli Luo Xiuzhi
State Key Laboratory of Precision Measurement Technology and Instruments,Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China
国际会议
第八届国际测试技术研讨会(8th International Symposium on Test and Measurement)
重庆
英文
2917-2920
2009-08-01（万方平台首次上网日期，不代表论文的发表时间）