Results 31 to 40 of about 70,192 (249)

Review of Fiber Bragg Grating Fabricated by Femtosecond Laser Processing

open access: yesGuangtongxin yanjiu, 2022
Fiber Bragg Grating (FBG) has the advantages of anti-electromagnetic interference, corrosion resistance, small size and low cost. Moreover, the FBG fabricated by femtosecond laser has the unique advantages of high temperature resistance.
Bao-yan DING   +6 more
doaj   +3 more sources

Investigation of Short-term Amplitude and Frequency Fluctuations of Lasers for Interferometry

open access: yesMeasurement Science Review, 2013
One of the limiting factors of accuracy and resolution in laser interferometry is represented by noise properties of the laser powering the interferometer.
Hrabina J., Lazar J., Holá M., Číp O.
doaj   +1 more source

Orbiting and In-Situ Lidars for Earth and Planetary Applications

open access: yesIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2021
At NASA Goddard Space Flight Center, we have been developing spaceborne lidar instruments for space sciences. We have successfully flown several missions in the past based on mature diode pumped solid-state laser transmitters.
Anthony W. Yu   +21 more
doaj   +1 more source

Generation of Large-area Arrays of Aperiodic Functional Micro/nano Structures Using Phase Shift Interferometry [PDF]

open access: yesInternational Journal of Electronics and Telecommunications, 2022
Phase shift interferometry (PSI) derived from interference technique as greater surface characterization technique based on the interference information recorded during a controlled phase shift.
Pearly Princess. J   +4 more
doaj   +1 more source

Development of a Compound Speckle Interferometer for Precision Three-Degree-of-Freedom Displacement Measurement

open access: yesSensors, 2021
In this study, a compound speckle interferometer for measuring three-degree-of-freedom (3-DOF) displacement is proposed. The system, which combines heterodyne interferometry, speckle interferometry and beam splitting techniques, can perform precision 3 ...
Hung-Lin Hsieh, Bo-Yen Sun
doaj   +1 more source

Non-destructive, dynamic detectors for Bose-Einstein condensates [PDF]

open access: yes, 2003
We propose and analyze a series of non-destructive, dynamic detectors for Bose-Einstein condensates based on photo-detectors operating at the shot noise limit. These detectors are compatible with real time feedback to the condensate.
A. Robert   +31 more
core   +1 more source

Research on absolute ranging technology of resampling phase comparison method based on FMCW

open access: yesOpen Physics, 2023
As an advanced optical precision ranging method, FMCW (frequency-modulated continuous-wave) laser interferometric ranging technology can achieve a large-scale and high-precision absolute distance measurement, so it has high research and application value
Sun Bin   +4 more
doaj   +1 more source

Development of Accuracy Evaluation Method for Open Loop Educational CNC Milling Machine

open access: yesRekayasa Mesin, 2021
The open-loop educational computer numerical control (CNC) milling machine requires accuracy verification in order to ensure its accuracy and functionality.
Agustinus Winarno   +4 more
doaj   +1 more source

Atom interferometry gravity-gradiometer for the determination of the Newtonian gravitational constant G [PDF]

open access: yes, 2006
We developed a gravity-gradiometer based on atom interferometry for the determination of the Newtonian gravitational constant \textit{G}. The apparatus, combining a Rb fountain, Raman interferometry and a juggling scheme for fast launch of two atomic ...
Bertoldi, A.   +9 more
core   +2 more sources

A Review of Optical Interferometry for High-Precision Length Measurement

open access: yesMicromachines
Optical interferometry has emerged as a cornerstone technology for high-precision length measurement, offering unparalleled accuracy in various scientific and industrial applications.
Guangyao Huang   +6 more
doaj   +1 more source

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