Traditionally, the Marchenko equation forms a basis for 1D inverse scattering problems. A 3D extension of the Marchenko equation enables the retrieval of the Green’s response to a virtual source in the subsurface from reflection measurements at the earth’s surface. This constitutes an important step beyond seismic interferometry. Whereas seismic interferometry requires a receiver at the positio...

Sound backscattered to a sonar from a seabed decreases in intensity with increasing range (R) due to geometrical spreading. As a far-range approximation, a geometrical spreading correction of +30 log R decibels may be applied. A correction based on an accurate estimation of the area of the seabed ensonified by the sonar pulse incorporates additional terms that are a function of: range, sonic ra...

Inverse scattering, seismic interferometry, and focusing are subjects usually studied as independent problems in different research areas. We speculate that a physical connection exists between them because the equations that rule these scattering principles have a similar functional form. With a visual explanation of the relationship between these principles, we describe the importance of the ...

Waves that propagate between two receivers can be extracted by cross correlating noise recorded at these receivers if the noise is generated by sources on a closed surface surrounding the receivers. This concept is called seismic interferometry. Of all these noise sources, those for whom the travel time difference for propagation to the two receivers is in the stationary phase zone, give the do...

A non-contact measurement method, namely electronic speckle pattern interferometer (ESPI), was used to investigate the tensile strain field of a composites plate in the presence of stress concentrations caused by a geometrical defect consisting of circular hole. ESPI uses the principle of 3D speckle interferometry to measure the deformation and contour of the measuring field with submicrometer ...

Polarimetric calibration accuracy is a key factor in the quantitative use of polarimetric SAR data as well as the design of future SAR system. This paper presents an approach to determine the maximum acceptable distortion level remaining after polarimetric calibration in Polarimetric SAR Interferometry (Pol-InSAR). PolInSAR distortion model of calibration is reviewed and discussed firstly. Then...

QCD predicts the existence of a new partonic Yukawa phase above a critical temperature Tc ∼ 150 MeV. I review some of the key observables which will be used in heavy ion reactions to search for this new phase at RHIC. Systematics of collective observables (Nch, E⊥), flow patterns, meson interferometry, jet quenching, and J/ψ suppression are discussed. This talk is updated with first data from R...

The Narrabri intensity interferometer was successfully used until 1974 to observe 32 stars [1], all brighter than B=+2.5, among which some were found to have an angular diameter as small as 0.41+/-0.03 milli-arcseconds (mas). The technique was then abandoned in favor of Michelson interferometry [2, 3]. Here we consider the technical feasibility and scientific potential of implementing intensity...

The implementation of structural health monitoring systems in modern aircraft structures made of carbon fibre reinforced plastics requires a deeper understanding of the propagation of impact generated Lamb waves. In this paper a digital shearing interferometry method is presented that allows visualization of laser generated Lamb waves. The contactless full field measurement of these waves is pe...

A new “self-calibrated” statistical analysis method has been developed for the reduction of nulling interferometry data. The idea is to use the statistical distributions of the fluctuating null depth and beam intensities to retrieve the astrophysical null depth (or equivalently the object’s visibility) in the presence of fast atmospheric fluctuations. The approach yields an accuracy much better...