Results 151 to 160 of about 10,667 (203)
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SPIE Proceedings, 1990
By using a multiphase detection technique, unambiguous shot-noise-limited measurements of unwrapped (i.e. not limited to modulo 21) interferometric phase may be made at data rates in excess of 1 MHz. This technique is ideally suited for use with laser diodes.
Michael Hercher, Geert Wyntjes
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By using a multiphase detection technique, unambiguous shot-noise-limited measurements of unwrapped (i.e. not limited to modulo 21) interferometric phase may be made at data rates in excess of 1 MHz. This technique is ideally suited for use with laser diodes.
Michael Hercher, Geert Wyntjes
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Laser interferometry based seismic sensor
SPIE Proceedings, 2003Laser interferometry is one of the most sensitive and versatile techniques for small relative displacements measurement. For these reasons it is used or it is being introduced in many different fields of research. One of its possible applications is seismic activity monitoring, obtained by fixing the mirrors of an interferometer to the ground. In order
BARONE, Fabrizio +3 more
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Diode lasers for interferometry
Precision Engineering, 1989Abstract The spectral properties of commercially-available GaAlAs diode lasers have been investigated. The results show that for the use of diode lasers in interferometers some criteria, which are discussed here, must be fulfilled. The emitted frequency of diode lasers is stabilized by holding constant or coupling their parameters, current and ...
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Retina, 1999
To determine the functional predictive value of laser interferometry (LI) in retinal detachment (RD).Laser interferometry with test field diameters of 3 degrees and 8 degrees, both with and without light, was tested preoperatively in 42 eyes with rhegmatogenous RD that were candidates for scleral buckling.
M, Roldán-Pallarés +2 more
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To determine the functional predictive value of laser interferometry (LI) in retinal detachment (RD).Laser interferometry with test field diameters of 3 degrees and 8 degrees, both with and without light, was tested preoperatively in 42 eyes with rhegmatogenous RD that were candidates for scleral buckling.
M, Roldán-Pallarés +2 more
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SPIE Proceedings, 1990
A system has been developed which is capable of interferometrically measuring optical path length changes, with high spatial and temporal resolutions. The capability to freeze fast motion is provided by the pulse length of the laser, the frame rate is determined by the laser and camera, and the spatial resolution is determined by the camera and data
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A system has been developed which is capable of interferometrically measuring optical path length changes, with high spatial and temporal resolutions. The capability to freeze fast motion is provided by the pulse length of the laser, the frame rate is determined by the laser and camera, and the spatial resolution is determined by the camera and data
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A tutorial on laser interferometry for precision measurements
2013 American Control Conference, 2013Laser interferometers have found wide usage in a variety of precision measurement applications. The ability to gain precise position information with minimal change to the dynamics of the device being measured has a large set of advantages. This allows interferometer systems to be used in feedback loops for precision systems.
Russell Loughridge +1 more
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A procedure for noise uncoupling in laser interferometry
Classical and Quantum Gravity, 2002A numerical procedure for noise recognition and uncoupling is described. The procedure is applied to a Michelson interferometer and is effective in seismic and acoustic noise uncoupling from the output signal of the interferometer. Due to the low data flow coming from the instrumentation this uncoupling can be performed in real time and it is useful as
F. Barone +5 more
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Laser Interferometry and Visual Prognosis in Uveitis
Ophthalmology, 1985Forty-six eyes in 26 patients with active, intermediate, and/or posterior uveitis with decreased visual acuity were evaluated with the laser interferometer before treatment with systemic cyclosporine. Pretreatment visual acuity (ETDRS), pretreatment laser interferometric visual acuity, and the best visual acuity obtained while under treatment were ...
A G, Palestine +3 more
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2004
Publisher Summary This chapter presents a phase-measuring technique in an unbalanced interferometer using direct frequency modulation of laser diodes (LD) sources by changing currents. The wavelength is stepwise, sinusoidally changed to introduce a time-varying phase difference between the two beams of the interferometer.
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Publisher Summary This chapter presents a phase-measuring technique in an unbalanced interferometer using direct frequency modulation of laser diodes (LD) sources by changing currents. The wavelength is stepwise, sinusoidally changed to introduce a time-varying phase difference between the two beams of the interferometer.
openaire +1 more source