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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 18, Iss. 8 — Aug. 1, 2001
  • pp: 1972–1979

Phase-map measurements by interferometry with sinusoidal phase modulation and four integrating buckets

Arnaud Dubois  »View Author Affiliations


JOSA A, Vol. 18, Issue 8, pp. 1972-1979 (2001)
http://dx.doi.org/10.1364/JOSAA.18.001972


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Abstract

Phase-shifting interferometry based on the integrating-bucket technique with sinusoidal phase modulation is studied theoretically and demonstrated experimentally to obtain phase maps from double-beam interferometers. The method uses four frames obtained by integration of the time-varying intensity in an interference pattern during the four quarters of the modulation period. An optimum sinusoidal phase modulation is found to minimize the effect of the additive noise. The absolute accuracy of the phase measurements is discussed. Possible applications of the method are demonstrated with two interference microscopes with which the phase modulation is achieved by sinusoidal oscillation of a mirror attached to a piezoelectric transducer and by sinusoidal birefringence modulation with a photoelastic modulator. In both experimental arrangements, phase images can be produced in real time at a rate of several hertz. Noise measurements are reported and compared with theory.

© 2001 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(180.3170) Microscopy : Interference microscopy

Citation
Arnaud Dubois, "Phase-map measurements by interferometry with sinusoidal phase modulation and four integrating buckets," J. Opt. Soc. Am. A 18, 1972-1979 (2001)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-18-8-1972

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