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	Measurement of density gradient for 2D flow field using grating schlieren deflectometry
	Meng Tao ; Zhang Ming-zhao ; Wang Ke-jun ; Guo Xiao-li ; Wang Bo-xiong
	2010-10-12 ; 2010-10-12
关键词	Practical Theoretical or Mathematical/ diffraction gratings optical modulation phase modulation schlieren systems wavelet transforms/ density gradient 2D flow field grating schlieren deflectometry fringe pattern wavelet transform phase demodulation method Ronchi grating phase extraction/ A4280N Schlieren devices A4280F Gratings, echelles A4230L Modulation and optical transfer functions A0230 Function theory, analysis A0760L Optical interferometry
中文摘要	A simple density gradient measurement system for 2D flow fields was proposed. The system introduced a grating into the traditional schlieren system and transformed deflection rays caused by density change of a flow field into the deformation of fringe pattern formed by grating projection, so density gradient information of the flow field could be extracted from the deformed fringe pattern. With wavelet location characteristics, a wavelet transform phase demodulation method was applied to fringe pattern analysis to eliminate effect of invalid data effectively. Experimental results indicate that the measuring range of the system can reach 0. 01 g/cm/sup 4/ and the measurement precision can reach 5* 10/sup -6/ g/cm/sup 1/ , which shows proposed system is simple in setup,easy in adjustment and suitable for density gradient measurement for flow fields with large density variation.
语种	中文
出版者	Editorial Board of Optics and Precision Engineering ; China
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/80154]
专题	清华大学
推荐引用方式 GB/T 7714	Meng Tao,Zhang Ming-zhao,Wang Ke-jun,et al. Measurement of density gradient for 2D flow field using grating schlieren deflectometry[J],2010, 2010.
APA	Meng Tao,Zhang Ming-zhao,Wang Ke-jun,Guo Xiao-li,&Wang Bo-xiong.(2010).Measurement of density gradient for 2D flow field using grating schlieren deflectometry..
MLA	Meng Tao,et al."Measurement of density gradient for 2D flow field using grating schlieren deflectometry".(2010).

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