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Proceedings 2017, 1(4), 590; doi:10.3390/proceedings1040590

Detection of Self-Mixing Interferometric Fringes of a Laser Sensor Using Matched Filter

1
Riphah International University, Islamabad, Pakistan
2
Riphah International University, Islamabad, Pakistan
3
LAAS-CNRS, Universite de Toulouse, CNRS, INPT, Toulouse, France
Presented at the Eurosensors 2017 Conference, Paris, France, 3–6 September 2017.
*
Author to whom correspondence should be addressed.
Published: 18 August 2017
Download PDF [1238 KB, uploaded 18 August 2017]

Abstract

Self-Mixing (SM) is a promising technique for sensing vibration, distance, velocity etc. To retrieve accurate metric measurements from an acquired SM signal, it is necessary to correctly detect all interferometric fringes. Traditionally, SM fringes are detected by a derivative based threshold (DBT) scheme. However, such a scheme gives correct results only for SM signals with high signal-to-noise ratio (SNR) and moderate optical feedback regime. So, in this paper, a better fringe detection method, based on Matched Filter (MF), is proposed which has provided correct SM fringe detection even in case of low SNR and weak optical feedback regime. The proposed approach has resulted in fringe detection accuracy of 100% for a low SNR SM signal belonging to the weak feedback regime.
Keywords: optical feedback interferometry; matched filter; displacement sensing; self-mixing optical feedback interferometry; matched filter; displacement sensing; self-mixing
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Akmal, M.; Zabit, U.; Bernal, O.D.; Bosch, T. Detection of Self-Mixing Interferometric Fringes of a Laser Sensor Using Matched Filter. Proceedings 2017, 1, 590.

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