Abstract

While high-sensitivity moiré interferometry requires monochromatic light, an auxiliary compensator grating removes the requirement. Experimental verification utilized white light for moiré interference of sensitivity 0.833 μm/fringe. Configurations readily amenable to compensation include moiré fringe multiplication by even factors and the minimum-deviation arrangement. Chromatic compensation is effective with virtual reference gratings as well as real reference gratings; in both cases the moiré interference system becomes achromatic. Compensation provides the special quality of nearly zero phase difference—an actual range of ±π—between interfering beams. Potential applications include use of electrical spark light sources for high-sensitivity dynamic moiré photography.

© 1979 Optical Society of America

Moiré interferometry

S. Yokozeki and S. Mihara
Appl. Opt. 18(8) 1275-1280 (1979)

Moire interferometry near the theoretical limit

Eric M. Weissman and Daniel Post
Appl. Opt. 21(9) 1621-1623 (1982)

Optical fringe multiplication in moiré interferometry

Xinlin Qing, Yuwei Qin, and Fulong Dai
Appl. Opt. 34(31) 7291-7294 (1995)

Displacement fields (U,W) obtained simultaneously by moiré interferometry

Michael L. Basehore and Daniel Post
Appl. Opt. 21(14) 2558-2562 (1982)

Moiré interferometry strain measurements in elastic thin membranes

R. D. Flack, J. G. Thacker, and J. G. Dixon
Appl. Opt. 18(22) 3841-3846 (1979)