Phase shifting grating-slit test with a cross slit.
A general graphical convolution method for fringe analysis of testing methods that use a spatially incoherent light source is presented. Results are shown for the grating-slit test using optical narrow and cross slits. The convolution method shows that phase shifting grating-slit test can be done with the cross slit at the expense of a reduced fringe contrast ratio. A phase shifting measurement with a cross-slit modulator yields high measurement precision and validates our fringe contrast theory.
Liang
Chao-Wen
CW
Department of Optics and Photonics, National Central University, No. 300, Jhongda Road, Jhongli City,Taoyuan County, Taiwan 32001, China.
Ou
Chien-Fu
CF
Sasian
Jose
J