Fourier-Domain Analysis of Complex Line Shapes

The development of a method of phase correction is discussed. Previous phase-correction methods have often required the input of an operator in order to extract phase information from the target spectrum. The use of this Fourier-domain phase-correction technique is discussed specifically in terms of its application to coherent anti-Stokes Raman spectra. The extraction of phase information and subsequent phase correction are discussed.

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Visual object tracking using Fourier domain phase information

Signal Image and Video Processing ◽

10.1007/s11760-021-01968-5 ◽

2021 ◽

Author(s):

Serdar Cakir ◽

A. Enis Cetin

Keyword(s):

Object Tracking ◽

Visual Object ◽

Fourier Domain ◽

Phase Information ◽

Visual Object Tracking ◽

Domain Phase

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Comparison of the coherent anti‐Stokes and coherent Stokes Raman line shapes of the ν1 line of β‐carotene near a one photon resonance

The Journal of Chemical Physics ◽

10.1063/1.436601 ◽

1978 ◽

Vol 69 (2) ◽

pp. 855-862 ◽

Cited By ~ 37

Author(s):

L. A. Carreira ◽

L. P. Goss ◽

Thomas B. Malloy

Keyword(s):

Raman Line ◽

Line Shapes ◽

Anti Stokes ◽

Photon Resonance ◽

Β Carotene

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What are the intensities and line-shapes of the twenty four polarization terms in coherent anti-Stokes Raman spectroscopy?

AIP Advances ◽

10.1063/1.4938102 ◽

2015 ◽

Vol 5 (12) ◽

pp. 127213

Author(s):

Kai Niu ◽

Soo-Y. Lee

Keyword(s):

Raman Spectroscopy ◽

Line Shapes ◽

Anti Stokes

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Some Effects of Fourier-domain Phase Quantization

IBM Journal of Research and Development ◽

10.1147/rd.145.0478 ◽

1970 ◽

Vol 14 (5) ◽

pp. 478-484 ◽

Cited By ~ 125

Author(s):

J. W. Goodman ◽

A. M. Silvestri

Keyword(s):

Fourier Domain ◽

Phase Quantization ◽

Domain Phase

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Ultrasound Imaging Using Spatial Domain Phase Information

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.742.118 ◽

2015 ◽

Vol 742 ◽

pp. 118-122

Author(s):

Liu Yang ◽

Chun Guang Xu ◽

Xin Liang Li ◽

Ye Huang

Keyword(s):

Ultrasound Imaging ◽

Time Of Flight ◽

Measuring Method ◽

Spatial Domain ◽

Guided Wave ◽

Ultrasonic Transducers ◽

Phase Information ◽

Flight Data ◽

Ultrasound Radiation ◽

Domain Phase

The aim of this paper is to determine the efficacy of the ring-shaped array used for imaging the objects inside the array. Hyperbola algorithm and ellipse algorithm which are conventionally used in the field of guided wave for locating the defects are developed and combined here to extract the image. Meanwhile, much more phase information is added in this process. Fan-shaped ultrasound radiation is generated separately by the 45 rectangular ultrasonic transducers which are circular embedded in the wall of a container. The time of flight data and the attenuation data are obtained and stored in the A-scan wave of each receiving transducer, subsequently, they are applied for reconstructing the image of all tested objects. The validity of the combined measuring method with phase information is demonstrated by imaging the distributed polyurethane objects.

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Phase Aberration Correction in Two Dimensions Using a Deformable Array Transducer

Ultrasonic Imaging ◽

10.1177/016173469501700303 ◽

1995 ◽

Vol 17 (3) ◽

pp. 227-247

Author(s):

Loriann L. Ries ◽

Stephen W. Smith

Keyword(s):

Adaptive Optics ◽

Ultrasonic Transducer ◽

Phase Correction ◽

Two Dimensions ◽

Ultrasound Images ◽

Two Dimensional ◽

Ultrasound Beam ◽

Dimensional Array ◽

Electronic Phase ◽

Correction Technique

Phase aberrations due to tissue inhomogeneities degrade medical ultrasound images by disrupting the ultrasound beam focus. Currently, phase correction algorithms are implemented by adjusting the electronic phase delays used to steer and focus the ultrasound beam. This means that a two-dimensional array is necessary to completely correct two-dimensional aberrations in tissue. However, two-dimensional arrays are a complex option due to their large number of elements and poor sensitivity. Instead of using a full two-dimensional array, a new technique is proposed, similar to one used in adaptive optics, which uses a deformable transducer of significantly fewer channels for two-dimensional phase correction. Phase correction in azimuth is achieved by altering the electronic phase delay of the element. However, phase correction in elevation is achieved by tilting the element in elevation with a piezoelectric actuator. Comparison of simulations of the new phase correction transducer versus the conventional phase correction technique have shown that a deformable 1 × N or 2 × N transducer can approach the image quality of a 4 × N two-dimensional array or greater. A prototype 1 times 32 array with eight low frequency piezoelectric actuators has been constructed such that every four ultrasonic transducer elements in azimuth are mounted on one independently controlled actuator. This prototype transducer was used to test the ability of a deformable array to produce real time phased array scans and to simulate on-line phase correction by tilting the elements in the elevation direction.

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