Self-Mixing Laser Sensor for Large Displacements: Signal Recovery in the Presence of Speckle

Laser self-mixing (SM) sensors are successfully used to measure displacement in the absence of speckle. However, speckle deforms the SM signal rendering it unusable for standard displacement extraction techniques. This article proposes a new signal-processing technique, based on tracking the signal...

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Bibliographic Details
Published in:IEEE sensors journal 2013-02, Vol.13 (2), p.824-831
Main Authors: Zabit, U., Bernal, O. D., Bosch, T.
Format: Article
Language:English
Subjects:
Displacement measurement
Engineering Sciences
envelope extraction
Fluctuations
Laser beams
Measurement by laser beam
Optics
Photonic
self-mixing interferometry
Signal processing
Speckle
Surface emitting lasers
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Summary:Laser self-mixing (SM) sensors are successfully used to measure displacement in the absence of speckle. However, speckle deforms the SM signal rendering it unusable for standard displacement extraction techniques. This article proposes a new signal-processing technique, based on tracking the signal envelope, to remedy this problem. Algorithm was successfully employed to measure long-range displacements (25 mm), in the presence of speckle and the lateral movement of the target, both causing severe corruption of the SM signal. It therefore enabled the use of the sensor on noncooperative targets without the need for sensor positioning and/or alignment. The results have been obtained for SM signals in which the envelope amplitude is varied by a factor of 28, without the loss of interferometric fringes. The use of this technique effectively removes the need for opto/electro-mechanical components traditionally used to measure long-range displacement in the presence of speckle.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2012.2227718