scholarly journals Development of Thermal Tomography Imaging System for In-Service Nondestructive Evaluation of Additively Manufactured Components

2020 ◽  
Author(s):  
Alexander Heifetz ◽  
Xin Zhang ◽  
Jafar Saniie ◽  
Boris Khaykovich
Keyword(s):  
Nondestructive Evaluation ◽  
Imaging System ◽  
Tomography Imaging ◽  
Thermal Tomography

Enhanced Laser-Based Magneto-Optic Imaging System for Nondestructive Evaluation Applications

2013 ◽  
Vol 62 (5) ◽  
pp. 1192-1198 ◽  
Author(s):  
Yuhua Cheng ◽  
Yiming Deng ◽  
Libing Bai ◽  
Kai Chen
Keyword(s):  
Nondestructive Evaluation ◽  
Imaging System ◽  
Magneto Optic

Dual-energy wave subtraction imaging for evaluation of barely visible impact damage with an ultrasonic propagation imaging system

2017 ◽  
Vol 29 (17) ◽  
pp. 3411-3425 ◽  
Author(s):  
Yunshil Choi ◽  
Jung-Ryul Lee
Keyword(s):  
Laser Beam ◽  
Nondestructive Evaluation ◽  
Composite Structures ◽  
Imaging System ◽  
Impact Damage ◽  
Dual Energy ◽  
Ultrasonic Waves ◽  
Excitation Energies ◽  
Ultrasonic Signals ◽  
Ultrasonic Propagation

Barely visible impact damage from low-velocity impacts have been studied as critical design factors of composite structures. In this article, a dual-energy wave subtraction algorithm using an ultrasonic propagation imaging system is proposed to evaluate barely visible impact damage as a strategy of fast in situ nondestructive evaluation or structural health monitoring (SHM). The ultrasonic propagation imaging system is a type of nondestructive evaluation or SHM system and is based on scanning laser-induced guided ultrasound and fixed sensors. The amplitude of ultrasonic signals generated by the ultrasonic propagation imaging system increases with the increasing energy of the laser beam. Two ultrasonic signals generated by different excitation energies of the laser beam can be equalized by multiplying a constant factor to one of them. Therefore, the residuals after subtraction of two signals may be close to zero. However, the two different energy induced signals in the damaged area will be nonzero due to the change in material conditions regarding the laser ultrasonic generation mechanism. The dual-energy wave subtraction algorithm eliminates most of the incident ultrasonic waves and amplifies anomalous waves. A composite wing skin including two barely visible impact damages as well as a composite sandwich panel, including a single barely visible impact damage, were inspected to validate the proposed algorithm.

scholarly journals Photoacoustic tomography imaging based on an acoustic lens imaging system

2006 ◽  
Vol 55 (8) ◽  
pp. 4365
Author(s):  
Chen Zhan-Xu ◽  
Tang Zhi-Lie ◽  
Wan Wei ◽  
He Yong-Heng
Keyword(s):  
Imaging System ◽  
Photoacoustic Tomography ◽  
Tomography Imaging ◽  
Acoustic Lens

scholarly journals Geophysical tomography imaging system. Final CRADA report

1998 ◽  
Author(s):  
S.J. Norton ◽  
I.J. Won
Keyword(s):  
Imaging System ◽  
Tomography Imaging ◽  
Geophysical Tomography

Fiber-Based Optical Coherence Tomography Imaging System with Rapid Scanning Optical Delay Line as Phase Modulator

2008 ◽  
Vol 35 (3) ◽  
pp. 476
Author(s):  
王玲 Wang Ling ◽  
丁志华 Ding Zhihua ◽  
史国华 Shi Guohua ◽  
张雨东 Zhang Yudong ◽  
朱瑛 Zhu Ying ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Delay Line ◽  
Imaging System ◽  
Phase Modulator ◽  
Optical Coherence ◽  
Optical Delay Line ◽  
Tomography Imaging ◽  
Optical Delay ◽  
Optical Coherence Tomography Imaging ◽  
Rapid Scanning
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