Results 21 to 30 of about 14,016 (258)

Orbiting and In-Situ Lidars for Earth and Planetary Applications

IEEE 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, Elisavet Troupaki, Steven X. Li, D. Barry Coyle, Paul Stysley, Kenji Numata, Molly E. Fahey, Mark A. Stephen, Jeffrey R. Chen, Guangning Yang, Frankie Micalizzi, Scott A. Merritt, Robert Lafon, Stewart Wu, Aaron Yevick, Hua Jiao, Demetrios Poulios, Matthew Mullin, Ying Xin Bai, Jane Lee, Oleg Konoplev, Aleksey Vasilyev   +21 more
doaj   +1 more source

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

Open 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, Song Junfang, Wang Chao, Li Lanlan, Tan Linqiu   +4 more
doaj   +1 more source

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

Sensors, 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

Review of Fiber Bragg Grating Fabricated by Femtosecond Laser Processing

Guangtongxin 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, Qiang ZHAO, Xiang-fei WANG, Peng-ju SI, Xiao-han FU, Jin-lei ZHAO, Yu YU   +6 more
doaj   +3 more sources

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

International 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, A. Alfred Kirubaraj, S. Christina Sophia, S. Senith, S.R. Jino Ramson   +4 more
doaj   +1 more source

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

Rekayasa 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, Sus Lasiyah, Benidiktus Tulung Prayoga, Ignatius Aris Hendaryanto, Fransiskus Xaverius Sukidjo   +4 more
doaj   +1 more source

A Review of Optical Interferometry for High-Precision Length Measurement

Micromachines
Optical interferometry has emerged as a cornerstone technology for high-precision length measurement, offering unparalleled accuracy in various scientific and industrial applications.
Guangyao Huang, Can Cui, Xiaoyang Lei, Qixue Li, Shuhua Yan, Xinghui Li, Guochao Wang   +6 more
doaj   +1 more source

Micromotion minimization using Ramsey interferometry

New Journal of Physics, 2021
We minimize the stray electric field in a linear Paul trap quickly and accurately, by applying interferometry pulse sequences to a trapped ion optical qubit.
Gerard Higgins, Shalina Salim, Chi Zhang, Harry Parke, Fabian Pokorny, Markus Hennrich   +5 more
doaj   +1 more source

Characterization of Acoustic Sources by Optical Feedback Interferometry

Proceedings, 2017
Sound can be described as the propagation of pressure variations in compressible media that involves compression and expansion and induces a change in the density of the medium.
Fernando Urgiles, Julien Perchoux, Thierry Bosch   +2 more
doaj   +1 more source

Application Research of Frequency-Modulated Continuous-Wave Displacement Sensor Based on Zero-Crossing Phase Detecting Algorithm

International Journal of Optics, 2021
Frequency-modulated continuous-wave (FMCW) interference, as a new technology of laser interferometry, has the advantages of length traceability, large range, high accuracy, simple structure, and optical fiber transmission.
Bin Sun, Junfang Song, Gang Zheng, Xiongxing Zhang   +3 more
doaj   +1 more source