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Applied Optics

Applied Optics


  • Vol. 37, Iss. 23 — Aug. 10, 1998
  • pp: 5386–5393

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

Rolf Rustad  »View Author Affiliations

Applied Optics, Vol. 37, Issue 23, pp. 5386-5393 (1998)

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A new, to the author’s knowledge, method for time-averaged TV holography measurements of small-amplitude vibrations is presented. In time-averaged TV holography with sinusoidal phase modulation of the reference arm of the interferometer, two phasors describe the object vibration and the modulation of the reference arm. By inversion of the squared zero-order Bessel function of the first kind, it is possible to measure the distance between these two phasors. The distances from an object-vibration phasor to a number of known reference phasors are measured to determine the amplitude and the phase of the object vibration. The method is demonstrated by the measurement of a vibration mode of a circular metal disk. The results are compared with theoretical data and with data obtained by a commonly used method in phase-modulated TV holography.

© 1998 Optical Society of America

OCIS Codes
(120.2880) Instrumentation, measurement, and metrology : Holographic interferometry
(120.6160) Instrumentation, measurement, and metrology : Speckle interferometry
(120.7280) Instrumentation, measurement, and metrology : Vibration analysis

Original Manuscript: January 26, 1998
Revised Manuscript: May 8, 1998
Published: August 10, 1998

Rolf Rustad, "Phasor-difference method for measuring the amplitude and the phase of small-amplitude vibrations with TV holography," Appl. Opt. 37, 5386-5393 (1998)

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