Quasi‐three‐dimensional inverse scattering computerized tomography for high‐precision sound velocity measurement in tissues

1996 ◽  
Vol 100 (4) ◽  
pp. 2796-2796
Author(s):  
Akira Yamada
Keyword(s):  
Sound Velocity ◽  
Computerized Tomography ◽  
Inverse Scattering ◽  
High Precision ◽  
Velocity Measurement ◽  
Three Dimensional

A Method of Seawater Sound Velocity Measurement Based on the Transit-Time

2013 ◽  
Vol 816-817 ◽  
pp. 439-442
Author(s):  
Bao Feng Zhang ◽  
Zhen Hai Liu ◽  
Xiao Ma
Keyword(s):  
Sound Velocity ◽  
Influencing Factors ◽  
High Precision ◽  
Transit Time ◽  
Precision Measurement ◽  
Propagation Velocity ◽  
Velocity Measurement ◽  
Velocity Variation ◽  
High Precision Measurement ◽  
Ultrasound Propagation

In the prospects of maritime development, the accuracy requirements of the marine sonar equipment also getting higher and higher, it is particularly important to measure the sound velocity in seawaters(ultrasound propagation velocity in seawater) in high-precision, in this experiment, basing on the seawater sound velocity variation influencing factors, proposing a method of average measuring the sound velocity of seawater based on STM32 and TDC-GP21 transit-time, The results of the experiment show that this method can be high-precision measurement of the size of the seawater sonic，meet the seawater sound velocity measurement requirements.

Research of the High-Precision Dual-Channel Sound Velocity of Seawater Measurement System

2014 ◽  
Vol 668-669 ◽  
pp. 940-943
Author(s):  
Bao Feng Zhang ◽  
Zi Ming Xie ◽  
Zhi Wei Li ◽  
Jun Chao Zhu
Keyword(s):  
Sound Velocity ◽  
High Precision ◽  
Measurement System ◽  
Velocity Measurement ◽  
Time Interval ◽  
Interval Measurement ◽  
Dual Channel ◽  
Precision Time ◽  
Time Interval Measurement ◽  
Time Of Flight Method

For single channel sound velocity measurement system accuracy was generally not high,a high-precision dual-channel sound velocity of seawater measurement system was designed.Based on ultrasonic speed of sound measurement in seawater with time-of-flight method,the system used ARM microcontroller to combine with high-precision time interval measurement chip,and the sound velocity measurement was translated into distance and time measurement. Then the influence of the time delay of the system was eliminated by method of difference.The paper introduced the modules of the system,and the high-precision time interval measurement method as the key technology of time-of-flight method for the velocity measurement system was expounded.It wasproved by experiment that the measurement accuracy of the system on the velocity reached 0.019m/s.

scholarly journals Imaging of bi-anisotropic periodic structures from electromagnetic near-field data

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Dinh-Liem Nguyen ◽  
Trung Truong
Keyword(s):  
Inverse Scattering ◽  
Maxwell Equations ◽  
Field Data ◽  
Periodic Structures ◽  
Near Field ◽  
Scattering Problem ◽  
Three Dimensional ◽  
Inverse Scattering Problem ◽  
Factorization Method ◽  
Unique Determination

AbstractThis paper is concerned with the inverse scattering problem for the three-dimensional Maxwell equations in bi-anisotropic periodic structures. The inverse scattering problem aims to determine the shape of bi-anisotropic periodic scatterers from electromagnetic near-field data at a fixed frequency. The factorization method is studied as an analytical and numerical tool for solving the inverse problem. We provide a rigorous justification of the factorization method which results in the unique determination and a fast imaging algorithm for the periodic scatterer. Numerical examples for imaging three-dimensional periodic structures are presented to examine the efficiency of the method.

Density and sound velocity measurement by an Anton Paar DSA 5000 density meter: Precision and long-time stability

2021 ◽  
Vol 329 ◽  
pp. 115547
Author(s):  
Zdeněk Wagner ◽  
Magdalena Bendová ◽  
Jan Rotrekl ◽  
Adéla Sýkorová ◽  
Maja Čanji ◽  
...  
Keyword(s):  
Sound Velocity ◽  
Velocity Measurement ◽  
Time Stability ◽  
Long Time ◽  
Long Time Stability

Pressure calibration and sound velocity measurement to 12 GPa in multi-anvil apparatus

2021 ◽  
Author(s):  
Wei Song ◽  
Shuangming Shan ◽  
Qizhe Tang ◽  
Chang Su ◽  
Yonggang Liu
Keyword(s):  
Sound Velocity ◽  
Velocity Measurement ◽  
Pressure Calibration
Sign in / Sign up

Export Citation Format

Share Document