Long distance laser ultrasonic propagation imaging system for damage visualization

Lee, Jung-Ryul; Shin, Hejin; Chia, Chen Ciang; Dhital, Dipesh; Yoon, Dong‐Jin; Huh, Yong-Hak

doi:10.1016/j.optlaseng.2011.07.011

Cited by 56 publications

(41 citation statements)

References 17 publications

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“…The data are acquired using a laser scanning system [5] which uses a Q-switched laser (QL) and a laser mirror scanner (LMS). These ultrasonic signal data are fed into a high speed ADC.…”

Section: System Architecturementioning

confidence: 99%

“…The resultant mapped data are visualized in terms of intensity maps to show the amplitude of signal for each impinging point in the inspected area along the time axis [2,5]. If the ultrasonic signal captured after each scan point is denoted by a vector denoted by: 9 intensity maps to show the amplitude of signal for each impinging point in the ins the time axis [2,5]. If the ultrasonic signal captured after each scan point is den denoted by:…”

Section: Ultrasonic Wave Propagation Imagingmentioning

confidence: 99%

“…9 intensity maps to show the amplitude of signal for each impinging point in the inspected the time axis [2,5]. If the ultrasonic signal captured after each scan point is denoted denoted by:…”

Section: Ultrasonic Wave Propagation Imagingmentioning

confidence: 99%

“…Whereas, in AWS, the structural discontinuity or damage is highlighted by subtraction of waves generated from two adjacent scan points after adjusting their amplitude and arrival time. This technology has the advantage of noncontact measurement, no requirement for any reference data, single scan processing, and ability to successfully examine complex geometrical structures [1][2][3][4][5]. Due to the significance of such technique, the focus of this technology is on safety crucial applications for example, aerospace structures.…”

Section: Introductionmentioning

confidence: 99%

“…17 (4), 467-475 (2016) The previous UPI system is predominantly based on software implementation. In it, a CPU has been used for damage evaluation algorithm implementation and signal processing [4,5]. The ability of CPU to perform many tasks within processor centric system in fact compromises its performance by sharing its resources with many processes [6,7].…”

Section: Introductionmentioning

confidence: 99%

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FPGA-based design and implementation of data acquisition and real-time processing for laser ultrasound propagation

Abbas¹,

Lee²,

Kim³

2016

International Journal of Aeronautical and Space Sciences

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Ultrasonic propagation imaging (UPI) has shown great potential for detection of impairments in complex structures and can be used in wide range of non-destructive evaluation and structural health monitoring applications. The software implementation of such algorithms showed a tendency in time-consumption with increment in scan area because the processor shares its resources with a number of programs running at the same time. This issue was addressed by using field programmable gate arrays (FPGA) that is a dedicated processing solution and used for high speed signal processing algorithms. For this purpose, we need an independent and flexible block of logic which can be used with continuously evolvable hardware based on FPGA. In this paper, we developed an FPGA-based ultrasonic propagation imaging system, where FPGA functions for both data acquisition system and real-time ultrasonic signal processing. The developed UPI system using FPGA board provides better cost-effectiveness and resolution than digitizers, and much faster signal processing time than CPU which was tested using basic ultrasonic propagation algorithms such as ultrasonic wave propagation imaging and multi-directional adjacent wave subtraction. Finally, a comparison of results for processing time between a CPU-based UPI system and the novel FPGA-based system were presented to justify the objective of this research.

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“…The data are acquired using a laser scanning system [5] which uses a Q-switched laser (QL) and a laser mirror scanner (LMS). These ultrasonic signal data are fed into a high speed ADC.…”

Section: System Architecturementioning

confidence: 99%