Abstract

By the general time-averaged shadow moire method only amplitude distribution of an object vibration is recorded. In this paper determination by means of the time-averaged shadow moire method of the vibrating phase of an arbitrary position on the object is presented. In this method the illumination angle of the reference grating is periodically oscillated at the same frequency as the object vibration. Therefore, stationary contour fringes are shifted to a vibrating region that vibrates in-phase oscillation of the illumination angle. Accordingly it is possible to determine the vibration phase of each region on the object as the signal phase added to the illumination angle oscillator.

© 1982 Optical Society of America

Time-averaged shadow-moiré method for studying vibrations

Y. Y. Hung, C. Y. Liang, J. D. Hovanesian, and A. J. Durelli
Appl. Opt. 16(6) 1717-1719 (1977)

Real-time shadow moire vibration measurement: method featuring simple setup, high sensitivity, and exact calibration

J. J. J. Dirckx, W. F. Decraemer, and J. L. Janssens
Appl. Opt. 25(20) 3785-3787 (1986)

Vibration analysis of plates by a time-averaged projection-moiré method

Reinhold Ritter and Hans-Juergen Meyer
Appl. Opt. 19(10) 1630-1633 (1980)

Time-average reflection-moiré method for vibration analysis of plates

F. P. Chiang and C. J. Lin
Appl. Opt. 18(9) 1424-1427 (1979)

Infrastructure of time-averaged projection moire fringes in vibration analysis

Philip Hopstone, Avi Katz, and Jacob Politch
Appl. Opt. 28(24) 5305-5311 (1989)