Misalignment measure error compensation in a passive phase-demodulated laser interferometer

Ho-Pui Ho; Yuen Ming Chan; K C Lo; S Y Wu

doi:10.1117/12.468163

22 May 2002 Misalignment measure error compensation in a passive phase-demodulated laser interferometer

Ho-Pui Ho, Yuen Ming Chan, K C Lo, S Y Wu

Proceedings Volume 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (2002) https://doi.org/10.1117/12.468163
Event: Fifth International Conference on Vibration Measurements by Laser Techniques, 2002, Ancona, Italy

Abstract

In this paper, we present a phase error correction algorithm for passive phase demodulation in Michelson interferometers. The key feature of the passive demodulation scheme is the incorporation of a grating (Ronchi) filter placed in front of optical detector. The filter is split into four quadrants and each of the quadrants imposes a 900phase shift. This quadrature feature offers single-step detection of phase information from the interference fringes, which are created by the superposition of the object and reference light beams. Our signal processing scheme incorporates first a diagonal subtraction, then followed by appropriate filtering and root mean square. In addition, this scheme can remove spurious intensity fluctuations induced by microphonics and unstable light source. An experimental setup has been constructed for demonstrating the operation ofthe proposed scheme. Simulation ofpossible errors due to grating misalignment and the effects on signal recovery will also be presented.

Citation Download Citation

Ho-Pui Ho, Yuen Ming Chan, K C Lo, and S Y Wu "Misalignment measure error compensation in a passive phase-demodulated laser interferometer", Proc. SPIE 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2002); https://doi.org/10.1117/12.468163

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