Abstract

Speckle-fringe quality can be improved by averaging many statistically independent interferograms together, which are generated by shifting the object’s illumination angle. A technique applicable to double-exposure speckle interferograms obtained from processing two speckle patterns is described. It utilizes a computer-controlled stepping motor to tilt the object illumination, which is repeatable to λ/100. Results are shown for double-exposure interferograms corresponding to mechanical deformations and vibrations. A significant increase in the fringe visibility is gained.

© 1985 Optical Society of America

Vibration-observation techniques for digital speckle-pattern interferometry

Katherine Creath and Gudmunn Å. Slettemoen
J. Opt. Soc. Am. A 2(10) 1629-1636 (1985)

Phase-shifting speckle interferometry

Katherine Creath
Appl. Opt. 24(18) 3053-3058 (1985)

Range and accuracy of speckle displacement measurement in double-exposure speckle photography

Jin Seung Kim
J. Opt. Soc. Am. A 6(5) 675-681 (1989)

Fringe scanning speckle-pattern interferometry

Suezou Nakadate and Hiroyoshi Saito
Appl. Opt. 24(14) 2172-2180 (1985)

Phase-object detection by use of double-exposure fringe-modulated speckle patterns

Myrian Tebaldi, Luciano Ángel, Marcelo Trivi, and Néstor Bolognini
J. Opt. Soc. Am. A 20(1) 116-129 (2003)