Dynamic frequency-domain interferometer for absolute distance measurements with high resolution

2014 ◽  
Vol 85 (11) ◽  
pp. 113112 ◽  
Author(s):  
Jidong Weng ◽  
Shenggang Liu ◽  
Heli Ma ◽  
Tianjiong Tao ◽  
Xiang Wang ◽  
...  
Keyword(s):  
High Resolution ◽  
Frequency Domain ◽  
Absolute Distance ◽  
Distance Measurements ◽  
Dynamic Frequency

High-resolution absolute-distance measurements using multiple-tunable fiber Bragg gratings

2004 ◽  
Author(s):  
E. Luquin ◽  
Orlando Frazao ◽  
Luis A. Ferreira ◽  
Francisco M. Araujo ◽  
Manuel Lopez-Amo ◽  
...  
Keyword(s):  
High Resolution ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Absolute Distance ◽  
Distance Measurements

Methods of calibration of high-resolution optical reflectometers operating in the frequency domain

2018 ◽  
pp. 40-43
Author(s):  
V.V. GRIGORIEV ◽  
◽  
V.E. KRAVTSOV ◽  
A.K. MITUEV ◽  
E.A. MOROZ ◽  
...  
Keyword(s):  
High Resolution ◽  
Frequency Domain

High Resolution Ultrasound Imaging Using Frequency Domain Interferometry

2012 ◽  
Vol 132 (10) ◽  
pp. 1552-1557 ◽  
Author(s):  
Hirofumi Taki ◽  
Takuya Sakamoto ◽  
Makoto Yamakawa ◽  
Tsuyoshi Shiina ◽  
Toru Sato
Keyword(s):  
High Resolution ◽  
Frequency Domain ◽  
Ultrasound Imaging

A High-resolution Imaging Algorithm for MIMO SAR Based on the Sub-band Synthesis in Frequency Domain

2011 ◽  
Vol 33 (5) ◽  
pp. 1082-1087 ◽  
Author(s):  
Yun-kai Deng ◽  
Qian Chen ◽  
Hai-ming Qi ◽  
Hui-fang Zheng ◽  
Ya-dong Liu
Keyword(s):  
High Resolution ◽  
Frequency Domain ◽  
High Resolution Imaging ◽  
Imaging Algorithm ◽  
Resolution Imaging

scholarly journals Velocity model building by 3D frequency-domain, full-waveform inversion of wide-aperture seismic data

Geophysics ◽  
2008 ◽  
Vol 73 (5) ◽  
pp. VE101-VE117 ◽  
Author(s):  
Hafedh Ben-Hadj-Ali ◽  
Stéphane Operto ◽  
Jean Virieux
Keyword(s):  
High Resolution ◽  
Frequency Domain ◽  
Distributed Memory ◽  
Waveform Inversion ◽  
Steepest Descent Method ◽  
Frequency Domain Method ◽  
Full Waveform Inversion ◽  
Direct Solver ◽  
Velocity Models ◽  
Full Waveform

We assessed 3D frequency-domain (FD) acoustic full-waveform inversion (FWI) data as a tool to develop high-resolution velocity models from low-frequency global-offset data. The inverse problem was posed as a classic least-squares optimization problem solved with a steepest-descent method. Inversion was applied to a few discrete frequencies, allowing management of a limited subset of the 3D data volume. The forward problem was solved with a finite-difference frequency-domain method based on a massively parallel direct solver, allowing efficient multiple-shot simulations. The inversion code was fully parallelized for distributed-memory platforms, taking advantage of a domain decomposition of the modeled wavefields performed by the direct solver. After validation on simple synthetic tests, FWI was applied to two targets (channel and thrust system) of the 3D SEG/EAGE overthrust model, corresponding to 3D domains of [Formula: see text] and [Formula: see text], respectively. The maximum inverted frequencies are 15 and [Formula: see text] for the two applications. A maximum of 30 dual-core biprocessor nodes with [Formula: see text] of shared memory per node were used for the second target. The main structures were imaged successfully at a resolution scale consistent with the inverted frequencies. Our study confirms the feasibility of 3D frequency-domain FWI of global-offset data on large distributed-memory platforms to develop high-resolution velocity models. These high-velocity models may provide accurate macromodels for wave-equation prestack depth migration.

Methods for Calibrating High-Resolution Optical Reflectometers Operating in the Frequency Domain

2018 ◽  
Vol 61 (9) ◽  
pp. 903-907
Author(s):  
V. V. Grigor’ev ◽  
V. E. Kravtsov ◽  
A. K. Mityurev ◽  
E. A. Moroz ◽  
A. O. Pogonyshev ◽  
...  
Keyword(s):  
High Resolution ◽  
Frequency Domain

High-Resolution Surface Topography Measurement Based on Frequency-Domain Analysis in White Light Interferometry

2018 ◽  
Vol 45 (6) ◽  
pp. 0604001
Author(s):  
邓钦元 Deng Qinyuan ◽  
唐燕 Tang Yan ◽  
周毅 Zhou Yi ◽  
杨勇 Yang Yong ◽  
胡松 Hu Song
Keyword(s):  
High Resolution ◽  
Frequency Domain ◽  
Surface Topography ◽  
White Light ◽  
Domain Analysis ◽  
Frequency Domain Analysis ◽  
White Light Interferometry

scholarly journals High-resolution measurement of long-range distances in RNA: pulse EPR spectroscopy with TEMPO-labeled nucleotides

2016 ◽  
Vol 7 (5) ◽  
pp. 3172-3180 ◽  
Author(s):  
Karin Halbmair ◽  
Jan Seikowski ◽  
Igor Tkach ◽  
Claudia Höbartner ◽  
Deniz Sezer ◽  
...  
Keyword(s):  
High Resolution ◽  
Long Range ◽  
Epr Spectroscopy ◽  
Base Pair ◽  
Distance Measurements ◽  
Model Free ◽  
High Resolution Measurement ◽  
Resolution Measurement ◽  
Pair Separation ◽  
Pulse Epr

Distance measurements in RNAs by pulse EPR with TEMPO-labeled nucleotides allow for model free conversion of distances into base-pair separation.

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