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Applied Optics

Applied Optics


  • Vol. 37, Iss. 34 — Dec. 1, 1998
  • pp: 7977–7982

Analysis of interferograms with a spatial radial carrier or closed fringes and its holographic analogy

Jorge García-Márquez, Daniel Malacara-Hernández, and Manuel Servín  »View Author Affiliations

Applied Optics, Vol. 37, Issue 34, pp. 7977-7982 (1998)

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It is well known that an interferogram can be demodulated to find the wave-front shape if a linear carrier is introduced. We show that it can also be demodulated if it has many closed fringes or a circular carrier appears. A basic assumption is that the carrier fringes are of a bandwidth adequate to contain the wave-front distortion. This phase determination, called here demodulation, is made in the space domain, as opposed to demodulation in Fourier space, but the low-pass filter characteristics must be properly chosen. For academic purposes a holographic analogy of this demodulation process is also presented, which shows that the common technique of multiplying by a sine function and a cosine function is equivalent to holographically reconstructing with a tilted-flat wave front. Alternatively, a defocused (spherical) wave front can be used as a reference to perform the reconstruction or demodulation of some closed-fringe interferograms.

© 1998 Optical Society of America

OCIS Codes
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(220.4840) Optical design and fabrication : Testing

Original Manuscript: May 20, 1998
Revised Manuscript: August 11, 1998
Published: December 1, 1998

Jorge García-Márquez, Daniel Malacara-Hernández, and Manuel Servín, "Analysis of interferograms with a spatial radial carrier or closed fringes and its holographic analogy," Appl. Opt. 37, 7977-7982 (1998)

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