Results 271 to 280 of about 157,060 (311)
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Self-mixing laser velocimetry: A realistic model
COMMAD 2012, 2012The self-mixing laser sensor makes compact, low-cost velocimetry sensing possible. In this work we describe a process for modelling the velocimetry signal that includes the dynamic speckle effect. We give results showing a good match between experimentally acquired signals and the model.
Kliese, Russell +3 more
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Fully analog self-mixing laser vibrometer
2011 IEEE International Instrumentation and Measurement Technology Conference, 2011This work concerns the implementation of a fully analog vibrometer utilizing self-mixing interferometric technique. Its working principle is a sort of unwrap of the interferometric signal: by analog elaborations the jumps of the signal are compensated.
NORGIA, MICHELE, PESATORI, ALESSANDRO
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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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Optics Letters, 2020
Differential measurement has strong anti-interference ability. We report the first, to the best of our knowledge, experimental demonstration of differential self-mixing interference signals using a randomly polarized laser for differential self-mixing interferometry (SMI).
Pan Qi +6 more
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Differential measurement has strong anti-interference ability. We report the first, to the best of our knowledge, experimental demonstration of differential self-mixing interference signals using a randomly polarized laser for differential self-mixing interferometry (SMI).
Pan Qi +6 more
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Self mixing low-coherence interferometry
1997In this paper a novel low-coherence interferometer using a self-mixing super luminescent diode is described. The optical scheme presented uses the photodiode on the back- face of a commercial super luminescent diode to detect the interference signal.
ROVATI, Luigi +2 more
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Wavelength Modulating Self-Mixing Interferometer
Applied Mechanics and Materials, 2017Self-mixing interference (SMI) was used to measure the displacement with a resolution of λ/2 by counting the interference signal peaks. In order to increase the measurement accuracy beyond λ/2, sinusoidal wavelength modulation (SWM) technique is introduced in SMI in this paper.
Dong Mei Guo, Hai Qing Jiang
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Millimeter wave self-mixing oscillators
International Journal of Infrared and Millimeter Waves, 1981Self-oscillating mixers in both dielectric and waveguide cavities have veen investigated in the 60 GHz frequency range. The deveces consist of negative resistance diodes of GaAs and InP material coupled to waveguide cavities or high resistivity dielectric cavities such as silicon or Al2O3.
Samuel Dixon, Harold Jacobs
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1994
A self-mixing oscillator is a circuitry acting as an RF local oscillator, into which a receiving signal can be conducted to be mixed with the local oscillation due to the nonlinear behaviour of the active device that generates the RF power. This is, in principle, the same as a self-oscillating mixer besides the fact that the produced local-oscillator ...
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A self-mixing oscillator is a circuitry acting as an RF local oscillator, into which a receiving signal can be conducted to be mixed with the local oscillation due to the nonlinear behaviour of the active device that generates the RF power. This is, in principle, the same as a self-oscillating mixer besides the fact that the produced local-oscillator ...
openaire +1 more source
Self-mixing laser diode vibrometer
Measurement Science and Technology, 2002The principle and the experimental realization of a new type of laser vibrometer based on the self-mixing interference effect in a laser diode are presented. The self-mixing configuration allows for a practical set-up that is simpler by far than conventional laser vibrometer schemes.
Guido Giuliani +2 more
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Optimization of VCSELs for Self-Mixing Sensing
IEEE Photonics Technology Letters, 2010We have simulated the variations in optical output power from a vertical-cavity surface-emitting laser (VCSEL) subject to self-mixing feedback, which is very important for applications in sensing. In order to maximize the self-mixing signal for a given feedback we have optimized the epitaxial design of the VCSEL.
Larsson, David +3 more
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