scholarly journals Modeling Flaw Pulse-Echo Signals in Cylindrical Components Using an Ultrasonic Line-Focused Transducer with Consideration of Wave Mode Conversion

Sensors ◽  
2019 ◽  
Vol 19 (12) ◽  
pp. 2744 ◽  
Author(s):  
Weixin Wang ◽  
Xiling Liu ◽  
Xiongbing Li ◽  
Gang Xu ◽  
Shuzeng Zhang
Keyword(s):  
Mode Conversion ◽  
Measurement Model ◽  
Wave Mode ◽  
Ultrasonic Measurement ◽  
Beam Model ◽  
System Function ◽  
Acoustic Transfer Function ◽  
Pulse Echo ◽  
Focused Transducers ◽  
Good Agreement

Investigations on flaw responses can benefit the nondestructive testing of cylinders using line-focused transducers. In this work, the system function, the wave beam model, and a flaw scattering model are combined to develop an ultrasonic measurement model for line-focused transducers to predict flaw responses in cylindrical components. The system function is characterized using reference signals by developing an acoustic transfer function for line-focused transducers, which works at different distances for both planar and curved surfaces. The wave beams in cylindrical components are modeled using a multi-Gaussian beam model, where the effects of wave mode conversion and curvatures of cylinders are considered. Simulation results of wave beams are provided to analyze their propagation behaviors. The proposed ultrasonic measurement model is certified from good agreement between the experimental and predicted signals of side-drilled holes. This work provides guidance for evaluating the detection ability of line-focused transducers in cylindrical component testing applications.

Prediction of Ultrasonic Signals Captured from a Side-Drilled Hole Using a Rectangular Transducer

2006 ◽  
Vol 321-323 ◽  
pp. 497-500
Author(s):  
Hak Joon Kim ◽  
Sung Jin Song ◽  
Lester W. Schmerr
Keyword(s):  
Reference Model ◽  
Measurement Model ◽  
Ultrasonic Measurement ◽  
Beam Model ◽  
System Efficiency ◽  
Ultrasonic Beam ◽  
Ultrasonic Signals ◽  
Measurement Results ◽  
Complete Measurement ◽  
Proper Interpretation

For the proper interpretation of ultrasonic measurement results from a side-drilled hole (SDH) using a rectangular transducer, it is very helpful to have a complete ultrasonic measurement model. A highly efficient ultrasonic beam model of a rectangular transducer and an accurate scattering model of a SDH are currently available. However, to develop such a complete measurement model, a reference model for the system efficiency factor is also needed. In this study a reference model suitable for a rectangular transducer is given and combined with existing models to develop a complete ultrasonic measurement model that can the predict ultrasonic signals from a SDH. Based on this model, we have calculated the ultrasonic signals from a SDH at different transducer orientations and compared the model-based predictions with experiments.

Ultrasonic Nondestructive Measurement Systems – Models and Measurements

2006 ◽  
Vol 321-323 ◽  
pp. 1-5 ◽  
Author(s):  
Ana Lopez-Sanchez ◽  
Lester W. Schmerr
Keyword(s):  
Ultrasonic Transducer ◽  
Measurement Model ◽  
Ultrasonic Measurement ◽  
Explicit Model ◽  
Nondestructive Measurement ◽  
Measurement Systems ◽  
Measured Voltage ◽  
Systems Models ◽  
Pulse Echo ◽  
Pulse Echo Method

The electroacoustic measurement model is an explicit model of an entire ultrasonic measurement system, including the pulser/receiver, cabling, and transducers. A summary is given of the measurement procedures needed for characterizing all the system elements contained in this measurement model, including a description of a new pulse-echo method for obtaining the sensitivity and impedance of an ultrasonic transducer. It is demonstrated that these models and measurement procedures can be combined to accurately simulate the measured voltage of a pulseecho immersion system.

An ultrasonic measurement model using a multi-Gaussian beam model for a rectangular transducer

Ultrasonics ◽  
2006 ◽  
Vol 44 ◽  
pp. e969-e974 ◽  
Author(s):  
Hak-Joon Kim ◽  
Sung-Jin Song ◽  
Lester W. Schmerr
Keyword(s):  
Gaussian Beam ◽  
Measurement Model ◽  
Ultrasonic Measurement ◽  
Beam Model

A Model to Predict Phased Array Ultrasonic Testing Signals from a Flat-Bottomed Hole in Two Medium

2006 ◽  
Vol 321-323 ◽  
pp. 501-504 ◽  
Author(s):  
Sung Jin Song ◽  
Joon Soo Park ◽  
Hak Joon Kim ◽  
Un Hak Seong ◽  
Suk Chull Kang ◽  
...  
Keyword(s):  
Phased Array ◽  
Steel Specimen ◽  
Measurement Model ◽  
Beam Model ◽  
Flat Bottom ◽  
Ultrasonic Signals ◽  
Array Transducer ◽  
Ultrasonic Phased Array ◽  
Set Up ◽  
Pulse Echo

In this study, the expanded multi-Gaussian beam model is adopted to develop a model to calculate the ultrasonic beam fields radiated from an ultrasonic phased array transducer. Combining this beam model with three other components including time delays, a far-field scattering model and a system efficiency factor, we develop a complete ultrasonic measurement model for predicting the phased array ultrasonic signals that can be captured from a flat-bottom hole in a steel specimen in a pulse-echo set-up using an array transducer mounted in a solid wedge. This paper describes the complete model developed with its key ingredients.

Fast wave mode conversion in three-ion component plasmas

2008 ◽  
Author(s):  
Yevgen Kazakov ◽  
Ivan Pavlenko ◽  
Igor Girka ◽  
Boris Weyssow
Keyword(s):  
Mode Conversion ◽  
Wave Mode ◽  
Fast Wave

Investigation of transcranial ultrasound delivery via Lamb wave mode conversion leveraging a transducer pair

2021 ◽  
Vol 150 (4) ◽  
pp. A32-A32
Author(s):  
Matteo Mazzotti ◽  
Eetu Kohtanen ◽  
Alper Erturk ◽  
Massimo Ruzzene
Keyword(s):  
Lamb Wave ◽  
Mode Conversion ◽  
Wave Mode ◽  
Transcranial Ultrasound

scholarly journals Poroelastic property analysis of seismic low-frequency shadows associated with gas reservoirs

2020 ◽  
Vol 17 (3) ◽  
pp. 463-474
Author(s):  
Shengjie Li ◽  
Ying Rao
Keyword(s):  
Mode Conversion ◽  
Low Frequency ◽  
Simulation Method ◽  
Wave Mode ◽  
Pore Fluid ◽  
Fluid Distribution ◽  
Gas Reservoirs ◽  
Tight Sandstone ◽  
Reservoir Properties ◽  
Gas Bearing

Abstract Seismic low-frequency amplitude shadows have been widely used as a hydrocarbon indicator. This study investigates the effect of reservoir properties and seismic wave mode conversion on the characteristics of the low-frequency amplitude shadows in gas-bearing reservoirs. The target gas reservoirs are typically related to the lithology of tight sandstone with strong heterogeneity. Pore-fluid distribution within the reservoirs presents patchy saturation in the vertical and horizontal directions, and this patchy saturation easily induces low-frequency shadows beneath gas-bearing reservoirs. These low-frequency shadows are validated by using a poroelastic simulation method. The results of our field case-based study indicate that pore-fluid property, plus the thickness and heterogeneity of reservoirs are the key elements in the generation of low-frequency shadows. The results also indicate that the poroelastic simulation method can be used to effectively predict the spatial distribution of gas-bearing reservoirs, by directly verifying the low-frequency shadow phenomenon existing in the seismic data.

Sign in / Sign up

Export Citation Format

Share Document