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Appl. Sci. 2018, 8(1), 129; doi:10.3390/app8010129

The Study of Non-Detection Zones in Conventional Long-Distance Ultrasonic Guided Wave Inspection on Square Steel Bars

1
School of Automation and Information Engineering, Xi’an University of Technology, Xi’an 710048, China
2
School of Physics and Optoelectronic Technology, Baoji University of Arts and Sciences, Baoji 721016, China
*
Author to whom correspondence should be addressed.
Received: 15 December 2017 / Revised: 13 January 2018 / Accepted: 15 January 2018 / Published: 17 January 2018
(This article belongs to the Special Issue Ultrasonic Guided Waves)
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Abstract

In a low-frequency ultrasonic guided wave dual-probe flaw inspection of a square steel bar with a finite length boundary, the flaw reflected pulse wave cannot be identified using conventional time monitoring when the flaw is located near the reflection terminal; therefore, the conventional ultrasonic echo method is not applicable and results in a non-detection zone. Using analysis and simulations of ultrasonic guided waves for the inspection of a square steel bar, the reasons for the appearance of the non-detection zone and its characteristics were analyzed and the range of the non-detection zone was estimated. Subsequently, by extending the range of the conventional detection time domain, the envelope of the specific reflected pulse signal was extracted by a combination of simulations and related envelope calculations to solve the problem of the non-detection zone in conventional inspection methods. A comparison between the simulation and the experimental results demonstrate that the solution is feasible. This study has certain practical significance for ultrasonic guided wave structural monitoring. View Full-Text
Keywords: ultrasonic guided wave; nondestructive testing; square steel bar; non-detection zone ultrasonic guided wave; nondestructive testing; square steel bar; non-detection zone
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Zhang, L.; Yang, Y.; Wei, X.; Yao, W. The Study of Non-Detection Zones in Conventional Long-Distance Ultrasonic Guided Wave Inspection on Square Steel Bars. Appl. Sci. 2018, 8, 129.

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