Ultrasound Imaging Using Spatial Domain Phase Information

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.

Optimization of ultrasonic transducers for selective guided wave actuation

2016 ◽  
Author(s):  
Mateusz Miszczynski ◽  
Pawel Packo ◽  
Paulina Zbyrad ◽  
Tadeusz Stepinski ◽  
Tadeusz Uhl ◽  
...  
Keyword(s):  
Guided Wave ◽  
Ultrasonic Transducers

Inspection of Concrete-Metal Rod Interface Using Guided Waves

2000 ◽  
Author(s):  
Won-Bae Na ◽  
Tribikram Kundu ◽  
Mohammad R. Ehsani
Keyword(s):  
Lamb Wave ◽  
Guided Waves ◽  
Lamb Waves ◽  
Guided Wave ◽  
Ultrasonic Transducers ◽  
Interface Debonding ◽  
Long Distance ◽  
Steel Rebar ◽  
Steel Bars ◽  
Steel Rebars

Abstract The feasibility of detecting interface degradation and separation of steel rebars in concrete beams using Lamb waves is investigated in this paper. It is shown that Lamb waves can easily detect these defects. A special coupler between the steel rebar and ultrasonic transducers has been used to launch non-axisymmetric guided waves in the steel rebar. This investigation shows that the Lamb wave inspection technique is an efficient and effective tool for health monitoring of reinforced concrete structures because the Lamb wave can propagate a long distance along the reinforcing steel bars embedded in concrete as the guided wave and is sensitive to the interface debonding between the steel rebar and concrete.

scholarly journals Survey of Thermal Plasma Composition in Saturn's Magnetosphere Using Time-of-Flight Data From Cassini/CAPS

2018 ◽  
Vol 123 (8) ◽  
pp. 6494-6513 ◽  
Author(s):  
M. Felici ◽  
C. S. Arridge ◽  
R. J. Wilson ◽  
A. J. Coates ◽  
M. Thomsen ◽  
...  
Keyword(s):  
Thermal Plasma ◽  
Time Of Flight ◽  
Plasma Composition ◽  
Flight Data

scholarly journals Rapid Deconvolution of Low-Resolution Time-of-Flight Data using Bayesian Inference

2019 ◽  
Author(s):  
Cornelius Pieterse ◽  
Michiel B. De Kock ◽  
Wesley D. Robertson ◽  
Hans C. Eggers ◽  
R. J. Dwayne Miller
Keyword(s):  
Time Of Flight ◽  
Stopping Criterion ◽  
Amplitude Ratios ◽  
Resolution Time ◽  
Low Resolution ◽  
Flight Data ◽  
Additional Information ◽  
Bayesian Prior ◽  
Accurate Quantification ◽  
General Method

Deconvolution of low-resolution time-of-flight data has numerous advantages including the ability to extract additional information from the experimental data. We augment the well-known Lucy-Richardson deconvolution algorithm by various Bayesian prior distributions and show that a prior of second-differences of the signal outperforms the standard Lucy-Richardson algorithm, accelerating the rate of convergence by more than a factor of four, while preserving the peak amplitude ratios of a similar fraction of the total peaks. A novel stopping criterion and boosting mechanism is implemented to ensure these methods converge to a similar entropy, and that local minima are avoided, respectively. Improvement by a factor of two in mass resolution allows more accurate quantification of the spectra. The general method is demonstrated in this paper by the deconvolution of fragmentation peaks of the DHB matrix, as well as the BTP thermometer ion, following femtosecond ultraviolet laser desorption.

scholarly journals Capturing Time-of-Flight data with confidence

CVPR 2011 ◽  
2011 ◽  
Author(s):  
Malcolm Reynolds ◽  
Jozef Dobos ◽  
Leto Peel ◽  
Tim Weyrich ◽  
Gabriel J Brostow
Keyword(s):  
Time Of Flight ◽  
Flight Data

Fourier-Domain Analysis of Complex Line Shapes

1989 ◽  
Vol 43 (1) ◽  
pp. 38-44 ◽  
Author(s):  
J. M. Bostick ◽  
L. A. Carreira
Keyword(s):  
Phase Correction ◽  
Fourier Domain ◽  
Phase Information ◽  
Line Shapes ◽  
Target Spectrum ◽  
Correction Technique ◽  
Subsequent Phase ◽  
Domain Phase ◽  
Anti Stokes ◽  
Previous Phase

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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