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Applied Optics

Applied Optics


  • Vol. 22, Iss. 10 — May. 15, 1983
  • pp: 1535–1539

Real-time fringe-pattern analysis

Lawrence Mertz  »View Author Affiliations

Applied Optics, Vol. 22, Issue 10, pp. 1535-1539 (1983)

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The task is to learn the phases of real positive intensity fringes from an optical testing interferometer. The introduction of substantial tilt into the interferometer establishes a field of finely spaced fringes that serve as a spatial heterodyne carrier. Sequential pixel values from a TV video signal of the picture are distributed among three separate signal channels, every third pixel going to the same channel. The distribution rate is set at ~3 pixels/fringe so that each channel senses one phase of a three-phase stroboscope or moiré. Complex weighting of the channel signals eliminates the common mode to provide in-phase and quadrature analog fringe signals. A direct analog-to-digital arctangent converter, with that analog signal pair as input, provides 4-bit (1/16-cycle resolution) fringe phase at a 5-MHz sampling rate. The converter is coupled to a turns counter that automatically registers unwrapped phase. The similarity of the signals to ntsc color TV encoding is noted along with certain other applications.

© 1983 Optical Society of America

Original Manuscript: December 3, 1982
Published: May 15, 1983

Lawrence Mertz, "Real-time fringe-pattern analysis," Appl. Opt. 22, 1535-1539 (1983)

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