This paper describes a new Moire fringe subdivided technique--direct subdivision technique, in which a linear CCD is used to subdivide Moire fringe directly. The CCD signals, after amplified and digitized, were sent into microcomputer. The microcomputer processed these signals and showed the direction and magnitude of displacememt.
"Direct subdivision of Moire fringe with CCD", Proc. SPIE 1230, International Conference on Optoelectronic Science and Engineering '90, 12301L (1 July 1990); doi: 10.1117/12.2294694; https://doi.org/10.1117/12.2294694