Results 111 to 120 of about 15,849 (201)

Time delay interferometry for LISA science and instrument characterization

, 2021
LISA, the Laser Interferometry Space Antenna, is the 3rd large mission (L3) of the ESA program Cosmic Vision with a junior partnership from NASA planned to be launched around 2034. Space-based gravitational wave observatories such as LISA have been developed for observation of sources that produce gravitational wave (GW) signals with frequencies in the
openaire   +2 more sources

Delay and dispersion characteristics of a frequency-domain optical delay line for scanning interferometry

, 2003
The reflective frequency-domain optical delay line employing a diffraction grating, a lens, and a tiltable mirror has emerged as a device particularly suitable for interferometry and optical coherence tomography.
Sampson, D. D., Zvyagin, A.V., Smith, E. D. J., Sampson, David, Zvyagin, A. V., Smith, E.D.J.   +5 more
core   +2 more sources

Subtracting and Monitoring Tilt-to-length Noise under High Differential Wavefront Sensing Noise Using Convolutional Neural Networks and Time Delay Interferometry

The Astrophysical Journal
Gravitational waves (GWs) provide a powerful tool to probe energetic astrophysical events and test fundamental physics, with space-based detectors enabling access to low-frequency signals from massive black hole mergers, extreme mass-ratio inspirals, and
Hao-Kang Chen, Pan-Pan Wang, Cheng-Gang Shao   +2 more
doaj   +1 more source

V-groove measurement with white light interferometry

, 2006
White Light Interferometry (WLI) provides a fast and convenient means to measure surface profile. With sub-nanometre resolution and non-contacting operation, WLI is also a promising means to estimate surface roughness parameters.
Gao, F., Coupland, J. M., Petzing, J.
core  

Observable-based reformulation of time-delay interferometry

Physical Review D
Spaceborne gravitational-wave observatories utilize a postprocessing technique known as time-delay interferometry (TDI) to reduce the otherwise overwhelming laser frequency noise by around 8 orders of magnitude. While, in its traditional form, TDI considers the spacecraft as point masses, recent studies have enhanced this simplified scenario by ...
Kohei Yamamoto, Jan Niklas Reinhardt, Olaf Hartwig   +2 more
openaire   +3 more sources

Metrics of Astrometric Variability in the International Celestial Reference Frame. I. Statistical Analysis and Selection of the Most Variable Sources

The Astrophysical Journal Supplement Series
Using very long baseline interferometry data for the sources that comprise the third International Celestial Reference Frame (ICRF3), we examine the quality of the formal source-position uncertainties of ICRF3 by determining the excess astrometric ...
Phil Cigan, Valeri V. Makarov, Nathan J. Secrest, David Gordon, Megan C. Johnson, Sebastien Lambert   +5 more
doaj   +1 more source

Alternative approach to time-delay interferometry with an optical frequency comb

Physical Review Applied
Spaceborne gravitational wave observatories, exemplified by the Laser Interferometer Space Antenna (LISA) mission, are designed to remove laser noise and clock noise from interferometric phase measurements in postprocessing. The planned observatories will utilize electro-optic modulators (EOMs) to encode the onboard clock timing onto the beam phase ...
Kohei Yamamoto, Hannah Tomio, Charlotte Zehnder, Kenji Numata, Holly Leopardi   +4 more
openaire   +2 more sources

Time reversal and plane-wave decomposition in seismic interferometry, inversion and imaging

, 2013
textThis thesis concerns the study of time reversal and plane-wave decomposition in various geophysical applications. Time reversal is a key step in seismic interferometry, reverse time migration and full waveform inversion.
Tao, Yi, active 2012
core   +1 more source

1 and 5 Day Differential INSAR Under Crossing Orbits with TerraSAR-X

, 2012
This paper presents investigations on a one year time series of crossing orbit differential interferometry SAR acquisitions with a 1-, 5- and 6-days temporal baseline.
De Zan, Francesco, Wollstadt, Steffen, Prats-Iraola, Pau, Steffen Wollstadt, Paco Lopez-Dekker, Francesco De Zan, Thomas Busche, Pau Prats-Iraola, Busche, Thomas, Krieger, Gerhard, Lopez-Dekker, Paco, Gerhard Krieger   +11 more
core   +1 more source

Zenith total delay study of a mesoscale convective system : GPS observations and fine-scale modelling

, 2002
Zenith Total Delay (ZTD) observations and model calculations are used to analyze a mesoscale convective system which yielded a large amount of precipitation over a short period of time in the north-western Mediterranean. ZTD observations are derived from
Cucurull, I., Rius, A., Vilà-Guerau de Arellano, J.   +2 more
core   +1 more source