A Compact Three Degrees-of-Freedom Motion Sensor Based on the Laser-Self-Mixing Effect

Ottonelli, Simona; Lucia, Francesco De; Vietro, M. di; Dabbicco, Maurizio; Scamarcio, Gaetano; Mezzapesa, Francesco P.

doi:10.1109/lpt.2008.926569

Cited by 32 publications

(23 citation statements)

References 3 publications

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“…from moderate to weak or vice versa) which may require further signal processing [1], [2]. A look into large displacement SM sensors reported earlier indicates that the use of co-operative targets has allowed avoiding speckle effect [5] and even helped in improving measurements by an order of magnitude [9]. On the other hand, long range SM displacement sensing has also been achieved by electronically keeping the operating point of the SM interferometer fixed at the half-fringe [10] though the sensor still requires additional optical components.…”

Section: Introductionmentioning

confidence: 99%

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

2013

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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/electromechanical components traditionally used to measure long-range displacement in the presence of speckle.

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Section: Introductionmentioning

confidence: 99%

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

2013

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“…The linear and angular resolutions obtained are 0.66 μm and 8 × 10 -4° (2.7 arcsec), respectively [5].…”

Section: Introductionmentioning

confidence: 87%

A no-contact laser sensor based on the Self-Mixing effect for the measurement of rotations

et al. 2008

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The development of a no-contact sensor based on the Self-Mixing effect for the simultaneous measurement of linear and angular degrees-of-freedom (DOFs) of a moving target is presented. The sensor is made up of three laser diodes with integrated monitor photodiodes and a plane mirror target attached to the moving object. The proposed technique makes the system easier to align with respect to the traditional interferometric systems and no further optical elements are required in the laser head except for the laser chip and its integrated photodiode, thus providing an effective compact and low-cost motion control system. The linear and angular resolutions are 0.7 μm and 0.8 × 10 -3°, respectively. A series of experiments is performed to test the proposed method by direct comparison with a reference meter system, showing a linear response over a range of 1 m and ± 0.4°. Moreover, the sensor is tested under complex displacement to validate the feasibility of simultaneous measurements of more than one DOF.

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“…The first one leads to the rough estimation of the phase x F (t). The output of this first step, guaranteeing at least a λ/2 precision, is similar to the final output of the sensor presented in [6] or the first stage output of the sensor presented in [5]. The second signal processing step deals with the joint estimation of parameters, C and α, by running an optimisation routine.…”

Section: A Phase Unwrapping Methodsmentioning

confidence: 99%

Self-mixing sensor for real-time measurement of harmonic and arbitrary displacements

Zabit

Bernal

Bosch

2012

2012 IEEE International Instrumentation and Measurement Technology Conference Proceedings

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A Compact Three Degrees-of-Freedom Motion Sensor Based on the Laser-Self-Mixing Effect

Cited by 32 publications

References 3 publications

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

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

A no-contact laser sensor based on the Self-Mixing effect for the measurement of rotations

Self-mixing sensor for real-time measurement of harmonic and arbitrary displacements

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