نتایج جستجو برای: interferometry

تعداد نتایج: 11315  

2010
Ping Zhou James H. Burge

Ping Zhou, James H. Burge College of Optical Science, University of Arizona, 1630 E. University Blvd., Tucson, AZ, USA 85721 [email protected] Abstract: Besides the geometrical errors, interferometry suffers errors due to diffraction, because the wavefront aberrations of the test and reference beams change as they propagate. This paper addresses errors due to diffraction effects in inter...

2017
Parameswaran Hariharan

The last few years have seen major advances in laser interferometry. The use of laser diodes whose output wavelength can be controlled by varying the injection current has led to the development of several new techniques in interferometry, as well as new methods for multiplexing fiber-interferometer sensors. New fields have also been opened up by phase-conjugate interferometers and the use of s...

Nowadays, satellite radar interferometry method plays an important role in calculating natural and artificial displacements, including displacements caused by floods, earthquakes, landslides, drilling of unauthorized wells, drilling of urban tunnels, etc. Metro tunneling is very important due to the importance of preventing irreparable financial and human losses. In Tehran, especially due to th...

2013
Nori Nakata Roel Snieder Seiichiro Kuroda Shunichiro Ito Takao Aizawa Takashi Kunimi

For health monitoring of a building, we need to separate the response of the building to an earthquake from the imprint of soil-structure coupling and from wave propagation below the base of the building. Seismic interferometry based on deconvolution, where we deconvolve the wave fields recorded at different floors, is a technique to extract this building response and thus estimate velocity of ...

Journal: :Optics letters 2012
Ayman F Abouraddy Timothy M Yarnall Bahaa E A Saleh

We generalize the traditional concept of temporal optical interferometry to any degree of freedom of a coherent optical field. By identifying the structure of a unitary optical transformation that we designate the generalized phase operator, we enable optical interferometry to be carried out in any modal basis describing a degree of freedom. The structure of the generalized phase operator is th...

2015
Xiuxiu Hou Guoman Huang Zheng Zhao

Polarimetric Interferometric Synthetic Aperture Radar (PolInSAR) is a new trend of SAR remote sensing technology which combined polarized multichannel information and Interferometric information. It is of great significance for extracting DEM in some regions with low precision of DEM such as vegetation coverage area and building concentrated area. In this paper we describe our experiments with ...

Journal: :Physical review letters 2017
Stuart S Szigeti Robert J Lewis-Swan Simon A Haine

Although SU(1,1) interferometry achieves Heisenberg-limited sensitivities, it suffers from one major drawback: Only those particles outcoupled from the pump mode contribute to the phase measurement. Since the number of particles outcoupled to these "side modes" is typically small, this limits the interferometer's absolute sensitivity. We propose an alternative "pumped-up" approach where all the...

1997
Q. H. Zhang X. Q. Li

We use a recently derived result to extract from two-pion interferometry data from pp̄ collisions the radius of the coherent component in the source. We find a coherent source radius of about 2fm. PACS numbers: 25.75. -q, 25.70. Pq, 25.70 Gh. Two-particle Bose-Einstein interferometry (also known as Hanbury Brown-Twiss intensity interferometry) as a method for obtaining information on the space-t...

2015
R. Balamurugan S. Umamaheswari S. Muruganand

This review paper deals about the main optical NDT (Non-Destructive Testing) method known as, electronic speckle Interferometry. Optical metrology is a field of physics, which includes theoretical and experimental methods to estimate physical parameters, using the light wavelength as fundamental scale. Most of the modern industries need quick and reliable measurement methods for measuring defor...

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