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光栅纹影法二维层化流体密度场测量技术研究
引用本文:孟涛,张明照,王克军,王伯雄,郭晓莉.光栅纹影法二维层化流体密度场测量技术研究[J].光学精密工程,2008,16(6):973-977.
作者姓名:孟涛  张明照  王克军  王伯雄  郭晓莉
作者单位:第二炮兵装备研究院
基金项目:科技部中德科技合作重点项目
摘    要:提出了一种简单的流体密度梯度分布测量系统,该系统在传统纹影系统中引入计量光栅,将光线因流体密度变化引起的偏折转变为投影条纹图的变形,通过分析变形条纹图来提取流体密度梯度分布信息.在分析条纹图时,使用小波变换相位分析法,利用小波变换的局部化特性,有效消除无效数据的影响.实验结果表明:系统的密度梯度测量范围能够达到0.01 g/cm4,测量精度能够达到5×10-6 g/cm4.系统装置简单,调节方便,适用于密度变化大的流体密度梯度测量.

关 键 词:Ronchi光栅  纹影法  小波分析  相位解调  流体密度梯度
收稿时间:2007-11-14
修稿时间:2008-01-09

Research on density measurement for 2D flow fields using grating Schlieren technology
MENG Tao,ZHANG Ming-zhao,WANG Ke-jun,GUO Xiao-li,WANG Bo-xiong.Research on density measurement for 2D flow fields using grating Schlieren technology[J].Optics and Precision Engineering,2008,16(6):973-977.
Authors:MENG Tao  ZHANG Ming-zhao  WANG Ke-jun  GUO Xiao-li  WANG Bo-xiong
Abstract: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/cm4 and the measurement precision can reach 5×10-6 g/cm4,which shows proposed system is simple in setup,easy in adjustment and suitable for density gradient measurement for flow fields with large density variation.
Keywords:Ronchi grating  schlieren technology  wavelet analysis  phase extraction  density gradient of flow
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