Results 271 to 280 of about 9,532 (300)

Simulation of Differential Interferometry and Comparison with Experimental Results

1997
This paper presents the computational simulation of a differential interferometer in a Mach-Zehnder arrangement with objects located outside the center of the interferometer. The computer simulation corresponds well to an experimental setup. This is illustrated for several basic phase objects. The theoretical models of these objects are discussed.
Rainer Wegenkittl, M. Eduard Gröller
openaire   +1 more source

Electron density measurement by differential interferometry

Review of Scientific Instruments, 2006
A novel differential interferometer is being developed to measure the electron density gradient and its fluctuations. Two separate laser beams with slight spatial offset and frequency difference are coupled into a single mixer making a heterodyne measurement of the phase difference which is <1% of the total phase change experienced by each beam ...
W. X. Ding, D. L. Brower, B. H. Deng, T. Yates   +3 more
openaire   +1 more source

Differential path considerations in optical stellar interferometry

Applied Optics, 1995
A formulation of the differential-air-path problem for a large-baseline optical interferometer is presented. Because air is a dispersive medium, each wavelength has a different optical path length. This can be corrected to a large extent if an extra piece of glass is placed in each arm of the interferometer.
openaire   +2 more sources

Differential phase interferometry with the Keck telescopes

2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720), 2005
We summarize the differential phase (DP) technique as well as the planned implementation at the Keck interferometer. Multicolor phase measurements are potentially a powerful astrophysical probe - and can allow ground-based direct detection of extrasolar planets.
openaire   +1 more source

Single-shot tomography by differential interferometry

Measurement Science and Technology, 1995
Presents a new interferometric measurement technique which makes it possible to determine the spatial refractive index distribution inside asymmetrical transparent objects. The suggested set-up, consisting of mirror galleries for producing several projections, a holographic beam coupling system including a method for suppressing possible object self ...
openaire   +1 more source

Retrieval of Svalbard ice flow velocities using Sentinel 1A/1B three-pass Differential SAR Interferometry

Geocarto International, 2022
Bala Raju Nela, Gulab Singh, Shradha Mohanty   +2 more
exaly  

Differential Interferometry

1994
R. Memmel, J. Straub
openaire   +1 more source

Observational Techniques Related to Differential Interferometry

1975
The combination of the basic principle of differential interferometry with additional optical components and systems leads to a variety of observational techniques. A classification of these techniques is given. With the different systems recording of the optical path modulation φ (x,y) by a phase object and any of its first and second derivatives in ...
openaire   +1 more source

Slightly off-axis interferometry based on spatial-carrier phase-shifting differential method

Optics and Laser Technology, 2023
Jiaosheng Li, Tianyun Liu, Qinnan Zhang   +2 more
exaly  

Precision vibration measurement using differential phase-modulated homodyne interferometry

Optics and Lasers in Engineering, 2023
Hui Liao, Jiandong Xie, Liping Yan
exaly