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Self-mixing interferometry for rotational speed measurement of servo drives
Applied Optics, 2016 Self-mixing interferometry (SMI) is an efficient technique applied to measure distance, velocity, displacement, and vibration. In this work, a compact and low cost SMI is applied to measure the rotational speed of a servo drive up to 6000 RPM. The application of SMI to rotational speed measurement of servo drives instead of the usage of incremental ...
Hui, Sun +3 more
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Ultimate error sources in self-mixing interferometry
IEEE SENSORS 2014 Proceedings, 2014 In high-accuracy interferometric measurements, once the main sources of error (misalignement, refractive index fluctuation) are removed or compensated for, residual errors due to field curvature and to the statistical nature of the scattered field ...
Giuseppe Martini +2 more
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Rotational speed measurement using self-mixing interferometry
Applied Optics, 2021Self-mixing interferometry (SMI) is a technique that is capable of measuring rotational speed in a direct way. Thus, SMI is an attractive alternative to optical encoders with respect to speed detection. But problems such as additive noises as well as amplitude and frequency modulation due to spectral broadening make the usage of self-mixing ...
Yang Liu, Jigou Liu, Ralph Kennel
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Fiber-optic biosensor based on self-mixing interferometry
, 2008 Self-mixing interferometry is a promising technique for a variety of measurement applications. Using a laser diode with an external cavity as interferometer, the technique offers several advantages over traditional interferometric configurations. This research used a self-mixing interferometer built in our own laboratory. It is based on a blue emitting
Määttälä, M. +4 more
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Quadrature detection for self-mixing interferometry
Optics Letters, 2018We establish a new quadrature detection system for self-mixing interferometry using two photodiodes and a 22.5-deg rotated beam splitter. The method is based on a rotating beam splitter placed between the laser diode and the measured object, and two quadrature self-mixing signals can be obtained.
Junfeng Wu, Fengfeng Shu
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Edge filter enhanced self-mixing interferometry
Optics Letters, 2015Self-mixing interferometry (SMI) represents a simple, robust, and self-aligned technique for metrology applications. Still, its applicability on diffuse targets is limited to distances up to few meters. We present an enhanced approach based on the detection of the frequency-modulated (FM) self-mixing signal. The FM signal detection is achieved using an
Victor, Contreras +2 more
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Convolutional Neural Network for self mixing interferometry
2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), 2021Self mixing inteferometry is a well established measurement scheme in which interference between the beam reflected by a target and the reference beam takes place inside the laser resonator (here a semiconductor laser) which emits said beam. This scheme can be used in many contexts (see the review [1] and the roadmap [2] ) including displacement ...
Stephane Barland, Francois Gustave
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A compact rangefinder based on self-mixing interferometry
SPIE Proceedings, 2012This paper presents the development of an optical rangefinder based on self-mixing interferometry. The instrument measures the absolute distance from a remote target, without contact and respecting the Class I safety. A variation of the laser diode bias current origins a modulation of the wavelength and then, due to the phase shift along the channel ...
NORGIA, MICHELE +3 more
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A displacement-measuring instrument utilizing self-mixing interferometry
IEEE Transactions on Instrumentation and Measurement, 2003We develop a self-mixing laser interferometer for the measurement of displacements on a generic target surface. The measurement is based on the bright-speckle tracking, a technique we have recently proposed to solve amplitude fading associated with the speckle statistics when the displacement to be covered is well in excess of the speckle longitudinal ...
NORGIA, MICHELE, S. DONATI
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Equivalent wavelength self-mixing interferometry for displacement measurement
Applied Optics, 2016In order to improve fringe precision of a self-mixing signal, a simple and effective method based on an equivalent wavelength self-mixing interferometer is presented. And a linearization fringe counting method is proposed for equivalent wavelength self-mixing interferometry to quickly reconstruct target displacement. The validity of the proposed method
Zhen, Huang +3 more
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