<title>Method of rapid fringe thinning for flow-field interferograms</title>

Abstract

In this paper, an algorithm of rapid fringe thining is presented. It consits of fringe smoothing and skeleton extracting. The pulsed noise and "barr1 in the fringes can be restrained effectively and the "hole" in the fringes can be padded. Som applications of the method to interferograms of explosive flow field and hypersonic shock tunnel flow field are presented also.

<title>Moire deflectometric visualization and processing of the boundary-layer transition image on a cone in a hypersonic flow</title>

“…Suppose the grid lines of G1 are parallel to yaxis, then the transmittance can be expressed in the Fourier series, t1(x,y) = exp(i2isx) (9) here ,, =n/d, C, is the Fourier factor. Similarly, if the angle between the grid lines of G2 and yaxis is 0, then the transmittance of G2 is,…”

A New Algorithm for Automatic Double Bright Fringe of Multiple-Beam Fizeau Fringe Skeletonization Using Fourier Transform Method of Fringe Pattern Analysis

“…In the second group, the intensity variation within a fringe is used in devising algorithms for fringe skeleton determination by using two methods. The first method is a thinning algorithm which erodes the fringes from all sides [26][27][28][29]. The disadvantage of this algorithm is that it usually requires numerous iteration in order to peel the fringe pattern.…”