Computer Moire© Deflectometry Using Talbot Effect

Abstract

Computer moiré -deflectometry (CMD) using one grating, a TV camera and a computer image processor (CIP) was developed. The TV camera is located in a Talbot plane allowing the recording of a (disturbed) image of the grating with maximum contrast and without any other optical component. CIP is used for obtaining, processing, as well as automated interpretation of the fringes. Double exposure, real -time , time-average and phase-measuring methods of CMD for transparent and reflective objects are equally demonstrated.

<title>Fourier transform moire deflectometry</title>

“…(6) wherefo is the fundamental frequency, p is the fringe phase, co_j_= 2sin(6/2) J t p ' (7) ço(x,y) = 2fod(x,y) (2) can be rewritten as t(x,y) = AAexp{i[2,rfox+nço(x,y)]}.…”