Results 41 to 50 of about 3,266 (205)

Determining System Parameters and Target Movement Directions in a Laser Self-Mixing Interferometry Sensor

open access: yesPhotonics, 2022
Self-mixing interferometry (SMI) is a promising sensing technology. As well as its compact structure, self-alignment and low implementation cost, it has an important advantage that conventional two-beam interferometry does not have, i.e., SMI signal ...
Bin Liu, Yuxi Ruan, Yanguang Yu
doaj   +1 more source

Use of diffuse reflections in tunable diode laser absorption spectroscopy: implications of laser speckle for gas absorption measurements [PDF]

open access: yes, 2008
We report the effects of self-mixing interference on gas detection using tunable diode laser spectroscopy. For very weak feedback, the laser diode output intensity gains a sinusoidal modulation analogous to that caused by low finesse etalons in the ...
Hodgkinson, Jane   +2 more
core   +1 more source

Ultrastable Offset-Locking Continuous Wave Laser to a Frequency Comb with a Compound Control Method for Precision Interferometry

open access: yesSensors, 2020
A simple and robust analog feedforward and digital feedback compound control system is presented to lock the frequency of a slave continuous wave (CW) laser to an optical frequency comb.
Ruitao Yang   +6 more
doaj   +1 more source

Laser Self-Mixing Sensor for Simultaneous Measurement of Young’s Modulus and Internal Friction

open access: yesPhotonics, 2021
The Young’s modulus and internal friction are two important parameters of materials. Self-mixing interferometry (SMI) is an emerging non-destructive sensing method that has been employed for various applications because of its advantages of simple ...
Bo Wang   +5 more
doaj   +1 more source

Frequency-swept feedback interferometry for noncooperative-target ranging with a stand-off distance of several hundred meters

open access: yesPhotoniX, 2022
Frequency-swept interferometry (FSI) is a powerful ranging method with high precision and immunity to ambient light. However, the stand-off distance of the current FSI-based ranging system for noncooperative targets is relatively short because the weak ...
Yifan Wang   +8 more
doaj   +1 more source

A self-mixing laser sensor design with an extended kalman filter for optimal online structure analysis and damping evaluation [PDF]

open access: yes, 2007
We have developed a new algorithm based on the extended Kalman filter, in order to improve the resolution of an optical displacement sensor. This new non contact sensor which provides vibration measurement with a very good accuracy might be used for ...
Bès, Caroline   +4 more
core   +1 more source

A Compact Laser Imaging System for Concurrent Reflectance Confocal Microscopy and Laser Doppler Flowmetry

open access: yesIEEE Photonics Journal, 2016
We propose a compact laser feedback interferometry imaging system for concurrent reflectance confocal microscopy and laser Doppler flowmetry. This system acquires both confocal reflectance and Doppler signals in a confocal architecture to image dynamic ...
Alireza Mowla   +6 more
doaj   +1 more source

Observation of a kilogram-scale oscillator near its quantum ground state [PDF]

open access: yes, 2009
We introduce a novel cooling technique capable of approaching the quantum ground state of a kilogram-scale system—an interferometric gravitational wave detector.
Blair, D   +999 more
core   +1 more source

Toward an Estimation of the Optical Feedback Factor C on the Fly for Displacement Sensing

open access: yesSensors, 2021
In this paper, a method based on the inherent event-based sampling capability of laser optical feedback interferometry (OFI) is proposed to assess the optical feedback factor C when the laser operates in the moderate and strong feedback regimes.
Olivier D. Bernal   +3 more
doaj   +1 more source

Influence of Fluorescence to Photon Lifetime Ratio on Detection Sensitivity in Laser Self-Mixing Interferometry

open access: yesIEEE Access, 2020
Laser self-mixing interferometry (SMI) has been widely applied in the fields of precision measurement in scientific research, industry and biomedicine, and most researchers preferentially utilize laser diodes (LD) as light sources due to their compact ...
Ke Kou, Cuo Wang, Jun Weng
doaj   +1 more source

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