scholarly journals Detectable Depth of Copper, Steel, and Aluminum Alloy Plates with Pulse-Echo Laser Ultrasonic Propagation Imaging System

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1607
Author(s):  
Dong-Il Kim ◽  
Ku-Rak Jung ◽  
Yoon-Soo Jung ◽  
Jae-Yeol Kim
Keyword(s):  
Aluminum Alloy ◽  
Imaging System ◽  
Front Surface ◽  
Acoustic Properties ◽  
Laser Ultrasonic ◽  
Excitation Laser ◽  
Scan Data ◽  
Ultrasonic Propagation ◽  
Hot Rolled ◽  
Pulse Echo

Pulse-echo laser ultrasonic propagation imaging is a nondestructive testing technique developed for composite materials and aluminum alloys used in aerospace. Although this method has been in usage for a considerable time, information of the detectable depth and the relationship between ultrasonic frequencies and the acoustic properties of metals is not readily available. Therefore, we investigate the A-scan and C-scan ultrasonic testing data of aluminum alloy, hot rolled steel, stainless steel, and copper alloy, which are used in aircraft bodies, frameworks, and gas pipelines. Experiments are performed with the pulse-width and excitation laser power fixed at 32 ns and approximately 4 W, respectively. The metal specimens include 24 artificial cylindrical defects with a diameter of 5 mm, located at depths of 1–12 mm on the front surface. The A-scan and C-scan data obtained at room temperature indicate the detectable depth for metals via the pulse-echo laser ultrasonic propagation imaging technique.

Long distance laser ultrasonic propagation imaging system for damage visualization

2011 ◽  
Vol 49 (12) ◽  
pp. 1361-1371 ◽  
Author(s):  
Jung-Ryul Lee ◽  
He-Jin Shin ◽  
Chen Ciang Chia ◽  
Dipesh Dhital ◽  
Dong-Jin Yoon ◽  
...  
Keyword(s):  
Imaging System ◽  
Long Distance ◽  
Laser Ultrasonic ◽  
Ultrasonic Propagation ◽  
Damage Visualization

Computer Simulations of Speckle in B-Scan Images

1983 ◽  
Vol 5 (4) ◽  
pp. 308-330 ◽  
Author(s):  
D.R. Foster ◽  
M. Arditi ◽  
F.S. Foster ◽  
M.S. Patterson ◽  
J.W. Hunt
Keyword(s):  
Imaging System ◽  
Three Dimensional ◽  
Single Scattering ◽  
Acoustic Properties ◽  
Ultrasound Images ◽  
Second Order Statistics ◽  
Diagnostic Potential ◽  
Scattering Volume ◽  
B Scan Images ◽  
Pulse Echo

The granularity or speckle in medical ultrasound images tends to mask the presence of small lesions. As well, artifactual filling in of anechoic regions such as cysts, reduces the diagnostic potential of the images. These effects depend not only on the acoustic properties of the tissue but also are strongly influenced by the imaging system, especially the transducer geometry. To study the effect of the transducer on the final B-scan image, a computer model has been developed simulating the interaction of ultrasound with a simple scattering medium. This model, incorporating the position dependence of the point response of the transducer, is based on single scattering from a collection of points positioned randomly in a three-dimensional volume. Using this approach, B-scan images showing speckle have been generated for different transducer geometries. Inclusion of a 2.6 mm void mimicking a cyst within the three-dimensional scattering volume has allowed us to predict the cyst contrast in the image for the different transducer systems. Experimental B-scan images of a scattering phantom were obtained using the different pulse echo systems. Quantitative assessment using first and second order statistics of the images shows good agreement between experiment and theory.

scholarly journals An investigation of ultrasound methods for the assessment of sex and age from intact human teeth

2018 ◽  
Vol 18 (1) ◽  
pp. 2-11
Author(s):  
Robin N. M. Feeney
Keyword(s):  
Imaging System ◽  
Potential Method ◽  
Acoustic Properties ◽  
Future Research ◽  
Ultrasound Wave ◽  
Human Skeletal Remains ◽  
Human Teeth ◽  
Longitudinal Waves ◽  
Pulse Echo

Determining sex and age in humanremains is necessary to achieve positive identificationof individuals in forensic settings, and to provide datarequired for demographic analyses in archaeologicalsamples. Due to their denser mineralization, teeth maybe better preserved than other skeletal elements, whichare often fragmentary and poorly preserved. This workis the first to investigate the use of ultrasound methodsto accurately, objectively, and non-destructively assesssex and estimate age of human skeletal remains fromintact teeth. An ultrasound imaging system usingpulse-echo technique and nominal frequency (3.5 MHz)longitudinal waves was developed for applicationon teeth. Mechanical and acoustic properties of teethwere examined to explore their relationship withthe interaction of ultrasound wave propagation.Experiments were conducted to determine differencesin wave propagation in teeth from individualsof different ages and sex, both permanent anddeciduous. Consistent differences in integral acousticresponse patterns in the different teeth were found.It is concluded that pulse-echo ultrasound is a viablenon-destructive technique to yield integral acousticcharacteristic properties of teeth, potentially usefulfor assessing sex and estimating age, and resolvingminimum numbers of individuals from commingledand scattered remains. Information developed fromthis study will be significant to future research insofaras it introduces a new potential method that is nondestructive,fast, and easy to administer in situ.

Development of pulse-echo ultrasonic propagation imaging system and its delivery to Korea Air Force

2017 ◽  
Author(s):  
Hasan Ahmed ◽  
Seung-Chan Hong ◽  
Jung-Ryul Lee ◽  
Jongwoon Park ◽  
Jeong-Beom Ihn
Keyword(s):  
Air Force ◽  
Imaging System ◽  
Ultrasonic Propagation ◽  
Pulse Echo

scholarly journals Characterization of Precipitation in 7055 Aluminum Alloy by Laser Ultrasonics

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 275
Author(s):  
Zhenge Zhu ◽  
Hao Peng ◽  
Yacheng Xu ◽  
Xueyong Song ◽  
Jinrong Zuo ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Electron Microscope ◽  
Laser Ultrasonics ◽  
Precipitate Size ◽  
Destructive Testing ◽  
Laser Ultrasonic ◽  
Precipitated Phase ◽  
Transmission Electron ◽  
7055 Aluminum Alloy ◽  
The Time Domain

After different rolling conditions, four 7055 aluminum alloy samples with different precipitation sizes were measured by scanning electron microscope, transmission electron microscope and laser ultrasonic. The attenuation coefficients of ultrasound measured by laser ultrasonic were calculated in the time domain, frequency domain and wavelet denoising, respectively. The relationship between the precipitate size and attenuation coefficient was established. The results show that the attenuation of the ultrasonic wave is related to the size of the precipitated phase; this provides a new method for rapid non-destructive testing of the precipitation of aluminum alloys.

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