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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 26 — Sep. 10, 2011
  • pp: 5064–5072

Improving the measurement performance for a self-mixing interferometry-based displacement sensing system

Yuanlong Fan, Yanguang Yu, Jiangtao Xi, and Joe F. Chicharo  »View Author Affiliations

Applied Optics, Vol. 50, Issue 26, pp. 5064-5072 (2011)

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Approaches that are, to our knowledge, novel, are proposed in this paper to improve the accuracy performance of self-mixing interferometry (SMI) for displacement measurement. First, the characteristics associated with signals observed in SMI systems are studied, based on which a new procedure is proposed for achieving accurate estimation of the laser phase. The studies also revealed the reasons for the inherent errors associated with the existing SMI-based techniques for displacement measurement. Then, this paper presents a new method for estimating the optical feedback level factor (denoted by C) in real time. Combining the new algorithms for estimating the laser phase and updating C value, the paper finally presents a novel technique for displacement measurement with improved accuracy performance in contrast to existing techniques. The proposed technique is verified by both simulation and experimental data.

© 2011 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(140.5960) Lasers and laser optics : Semiconductor lasers
(280.3420) Remote sensing and sensors : Laser sensors

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: March 31, 2011
Revised Manuscript: July 5, 2011
Manuscript Accepted: July 19, 2011
Published: September 5, 2011

Yuanlong Fan, Yanguang Yu, Jiangtao Xi, and Joe F. Chicharo, "Improving the measurement performance for a self-mixing interferometry-based displacement sensing system," Appl. Opt. 50, 5064-5072 (2011)

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