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 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

Ultrasonic B-Scan Echoarteriographic Imaging of Experimentally Induced Thrombi in Dogs

Neurosurgery ◽  
1979 ◽  
Vol 4 (4) ◽  
pp. 301-307 ◽  
Author(s):  
Laligam N. Sekhar ◽  
Jack F. Wasserman ◽  
Johanna van der Bel-Kahn ◽  
Charles P. Olinger
Keyword(s):  
Imaging System ◽  
Center Frequency ◽  
Time Operation ◽  
Real Time Operation ◽  
Health And Disease ◽  
The University ◽  
Scanning Mechanism ◽  
Arterial Damage ◽  
Pulse Echo ◽  
Frequency Pulse

Abstract Ultrasonic echoarteriography is a noninvasive method of visualizing extracranial arteries in health and disease. The realtime echoscanning device developed at the University of Cincinnati utilizes a 5-MHz (center frequency) pulse-echo imaging system. B-mode pictures of the tissues studied are obtained and displayed on a video screen, real-time operation being provided by the scanning mechanism operating at 30 frames per second. In our experiments internal arterial damage produced by surgically scraping the intima induced experimental thrombosis in nine carotid and three femoral arteries in dogs. Where pathologically demonstrated, the thrombi were demonstrated by ultrasonic echoarteriography in every instance. Echoarteriography seemed more sensitive than contrast arteriography in the detection of a partially occlusive thrombus.

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