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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 15 — Jul. 19, 2010
  • pp: 16090–16095

Fourier transform demodulation of pixelated phase-masked interferograms

M. Servin, J. C. Estrada, and O. Medina  »View Author Affiliations

Optics Express, Vol. 18, Issue 15, pp. 16090-16095 (2010)

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Recently a new type of spatial phase shifting interferometer was proposed that uses a phase-mask over the camera’s pixels. This new interferometer allows one to phase modulate each pixel independently by setting the angle of a linear polarizer built in contact over the camera’s CCD. In this way neighbor pixels may have any desired (however fixed) phase shift without cross taking. The standard manufacturing of these interferometers uses a 2x2 array with phase-shifts of 0, π/2, π, and 3π/2 radians. This 2x2 array is tiled all over the video camera’s CCD. In this paper we propose a new way to phase demodulate these phase-masked interferograms using the squeezing phase-shifting technique. A notable advantage of this squeezing technique is that it allows one the use of Fourier interferometry wiping out the detuning error that most phase shifting algorithms suffers. Finally we suggest the use of an alternative phase-mask to phase modulate the camera’s pixels using a linear spatial carrier along a given axis.

© 2010 OSA

OCIS Codes
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis
(120.3180) Instrumentation, measurement, and metrology : Interferometry

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: April 7, 2010
Revised Manuscript: July 2, 2010
Manuscript Accepted: July 5, 2010
Published: July 15, 2010

M. Servin, J. C. Estrada, and O. Medina, "Fourier transform demodulation of pixelated phase-masked interferograms," Opt. Express 18, 16090-16095 (2010)

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