New phase-locked demodulation method of photocarrier fringe patterns

Wenyi Chen; Yushan Tan

doi:10.1117/12.135294

1 January 1992 New phase-locked demodulation method of photocarrier fringe patterns

Wenyi Chen, Yushan Tan

Proceedings Volume 1553, Laser Interferometry IV: Computer-Aided Interferometry; (1992) https://doi.org/10.1117/12.135294
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

Recently, we proposed a new method called orthogonal coherent phase-lock detection (OCPLD) for demodulation of the phase distribution of photo-carrier fringe patterns. In OCPLD, if carrier fringe is introduced along the x-axis, orthogonal coherent phase detection technique is used to demodulate the phase distribution along the x-axis, while the phase-locked technique is used to track the phase variation along the y-axis. In this paper, OCPLD technique is presented, and its mathematical model of phase demodulation and phase transfer function are derived. The error analysis of OCPLD is also given. Experimental results show that OCPLD is a precision and rapid method.

Citation Download Citation

Wenyi Chen and Yushan Tan "New phase-locked demodulation method of photocarrier fringe patterns", Proc. SPIE 1553, Laser Interferometry IV: Computer-Aided Interferometry, (1 January 1992); https://doi.org/10.1117/12.135294

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KEYWORDS

Demodulation

Fringe analysis

Error analysis

Linear filtering

Phase shift keying

Radon

Laser interferometry

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