Laser‐Self‐Mixing Interferometry for Mechatronics Applications

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

doi:10.3390/s90503527

Cited by 36 publications

(18 citation statements)

References 27 publications

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“…33 The power spectrum [Eq. (1)] provides information about the scattered particles, such as velocity, along the laser light axis and other properties, such as the concentration in the volume and their size. 39 …”

Section: Methodsmentioning

confidence: 99%

Laser diode self-mixing interferometry for velocity measurements

2015

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A diode laser velocimeter based on laser self-mixing has been developed and characterized as a reliable, precise, comparably cheap, and compact monitor. The resolution of this sensor at different incident angles and for a variety of solid and liquid targets moving at velocities between 0.1 and 50 m∕s is presented. This includes a theoretical analysis of the underlying measurement principle, highlighting possibilities to extend the measurement capabilities to even higher velocities by altering the sensor design. Finally, an outlook on future applications of the sensor for detailed studies of supersonic gas jets used in beam diagnostics and atomic physics applications is given. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Methodsmentioning

confidence: 99%

Laser diode self-mixing interferometry for velocity measurements

2015

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“…SMI is an experimental technique which has been extensively used for displacement, vibration, and velocity sensing during the past decades [26]- [28]. It is based on measuring the beat arising from the interference of a portion of the laser beam back reflected into the laser cavity by a moving target (the motor shaft in this case) and the standing wave inside the cavity.…”

Section: Analysis Of Mechanical Effects Of Demagnetization Faultsmentioning

confidence: 99%

Shaft Trajectory Analysis in a Partially Demagnetized Permanent-Magnet Synchronous Motor

Urresty

Atashkhooei

Riba

et al. 2013

IEEE Trans. Ind. Electron.

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Demagnetization faults have a negative impact on the behavior of permanent-magnet synchronous machines, thus reducing their efficiency, generating torque ripple, mechanical vibrations, and acoustic noise, among others. In this paper, the displacement of the shaft trajectory induced by demagnetization faults is studied. It is proved that such faults may increase considerably the amplitude of the rotor displacement. The direct measure of the shaft trajectory is performed by means of a noncontact self-mixing interferometric sensor. In addition, the new harmonics in the back electromotive force (EMF) and the stator current spectrum arising from the shaft displacement are analyzed by means of finite-element method (FEM) simulations and experimental tests. Since conventional finite-element electromagnetic models are unable to predict the harmonics arising from the shaft trajectory displacement, an improved finite-element model which takes into account the measured trajectory has been developed. It is shown that this improved model allows obtaining more accurate back EMF and stator current spectra than those obtained by means of conventional models. This work presents a comprehensive analysis of the effects generated by demagnetization faults, which may be useful to develop improved fault diagnosis schemes.

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“…[ 6,7,8,9] Obviously, when measurement has to be performed in air-in the routine laboratory measurements-the refractive index of air represents a major source of uncertainty. Using conventional scanning microscopes, already millimetre-sized samples had been scanned with nanometre-resolution.…”

Section: Introductionmentioning

confidence: 99%

In-beam tracking refractometry for coordinate interferometric measurement

Holá

Lazar

Buchta

2014

Optical Micro- And Nanometrology V

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We propose to extend the principle of compensation of the fluctuations of the refractive index of air through monitoring the optical length within the measuring range of the displacement measuring interferometer. The concept is derived form a tracking refractometry evaluating the refractive index of air in the beam axis coinciding with the positioning interferometer. Application of this approach in multi-axis positioning and measurement mans to compromise the principle of spatial unity of the displacement measuring laser beam and the beam of the tracking refractometer. In this contribution we evaluate the level of uncertainty associated with the spatial shift of these two beams. Consequently the nature of the fluctuations of the refractive index of air in laser interferometry is investigated and discussed with the focus on potential applications in coordinate measuring systems and long-range metrological scanning probe microscopy systems.

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Laser‐Self‐Mixing Interferometry for Mechatronics Applications

Cited by 36 publications

References 27 publications

Laser diode self-mixing interferometry for velocity measurements

Laser diode self-mixing interferometry for velocity measurements

Shaft Trajectory Analysis in a Partially Demagnetized Permanent-Magnet Synchronous Motor

In-beam tracking refractometry for coordinate interferometric measurement

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