Visualization of turbulence anisotropy by single exposure speckle photography

Abstract

A new technique based on single exposure speckle photography is described that allows to measure the degree of anisotropy of turbulence in a flow with fluctuating fluid density or temperature.Since anisotropy is linked to shear in a flow, the method is also a means for discriminating regions of different shear rate.

<title>Temperature profile/fluctuations of a two-dimensional slot burner using laser speckle photography</title>

“…Number of techniques have been investigated to measure the refractive index/flow/temperature by using various optical techniques [1][2][3][4][5]. Talbot interferometry [2], laser speckle photography [3], laser speckle shearing interferometry [4] techniques have been applied for the measurement of temperature/temperature profile of two dimensional burners used in atomic absorption spectrophotometer.…”

“…Talbot interferometry [2], laser speckle photography [3], laser speckle shearing interferometry [4] techniques have been applied for the measurement of temperature/temperature profile of two dimensional burners used in atomic absorption spectrophotometer. [5] have investigated single exposure laser speckle photography for visualization of turbulence anisotropy in flow with fluctuating fluid density or temperature. Recently Merzkirch etal.…”