Abstract

Phase stepping between frames in TV holography is combined with sinusoidal phase modulation to determine phase and amplitude distributions of objects vibrating with small amplitudes (<λ/20, where λ is the wavelength of the laser light used). This technique has applications in, for example, optical modal analysis and the determination of harmonic sound fields in air and water. The noise reduction that is obtained with the phase-stepping technique reduces the number of interferograms needed by one-half, which can shorten experimental time. The technique is robust, easy to use, and illustrated by modes of vibration in a simple plate and in a more complicated structure (a violin).

© 1996 Optical Society of America

Phasor-difference method for measuring the amplitude and the phase of small-amplitude vibrations with TV holography

Rolf Rustad
Appl. Opt. 37(23) 5386-5393 (1998)

Sound in flight: measurement of sound fields by use of TV holography

Ole J. Løkberg
Appl. Opt. 33(13) 2574-2584 (1994)

Time-average TV holography for vibration fringe analysis

Upputuri Paul Kumar, Yanam Kalyani, Nandigana Krishna Mohan, and Mahendra Prasad Kothiyal
Appl. Opt. 48(16) 3094-3101 (2009)

Vibration phase mapping using electronic speckle pattern interferometry

Ole J. Løkberg and Kåre Høgmoen
Appl. Opt. 15(11) 2701-2704 (1976)

Effect of phase mismatch on pseudo-phase-step analysis of time-average hologram recordings of vibration modes

Karl A. Stetson
Appl. Opt. 45(25) 6473-6476 (2006)