Next Article in Journal
Automatic Recognition of Aggressive Behavior in Pigs Using a Kinect Depth Sensor
Previous Article in Journal
Tracking Architecture Based on Dual-Filter with State Feedback and Its Application in Ultra-Tight GPS/INS Integration
 
 
Font Type:
Arial Georgia Verdana
Font Size:
Aa Aa Aa
Line Spacing:
Column Width:
Background:
Article

Multi-Mode Electromagnetic Ultrasonic Lamb Wave Tomography Imaging for Variable-Depth Defects in Metal Plates

State Key Lab of Power Systems, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
*
Author to whom correspondence should be addressed.
Sensors 2016, 16(5), 628; https://doi.org/10.3390/s16050628
Submission received: 24 March 2016 / Revised: 26 April 2016 / Accepted: 27 April 2016 / Published: 2 May 2016
(This article belongs to the Section Physical Sensors)

Abstract

This paper proposes a new cross-hole tomography imaging (CTI) method for variable-depth defects in metal plates based on multi-mode electromagnetic ultrasonic Lamb waves (LWs). The dispersion characteristics determine that different modes of LWs are sensitive to different thicknesses of metal plates. In this work, the sensitivities to thickness variation of A0- and S0-mode LWs are theoretically studied. The principles and procedures for the cooperation of A0- and S0-mode LW CTI are proposed. Moreover, the experimental LW imaging system on an aluminum plate with a variable-depth defect is set up, based on A0- and S0-mode EMAT (electromagnetic acoustic transducer) arrays. For comparison, the traditional single-mode LW CTI method is used in the same experimental platform. The imaging results show that the computed thickness distribution by the proposed multi-mode method more accurately reflects the actual thickness variation of the defect, while neither the S0 nor the A0 single-mode method was able to distinguish thickness variation in the defect region. Moreover, the quantification of the defect’s thickness variation is more accurate with the multi-mode method. Therefore, theoretical and practical results prove that the variable-depth defect in metal plates can be successfully quantified and visualized by the proposed multi-mode electromagnetic ultrasonic LW CTI method.
Keywords: multi-mode Lamb waves (LWs); variable-depth defects; electromagnetic acoustic transducers (EMATs); cross-hole tomography imaging (CMI) multi-mode Lamb waves (LWs); variable-depth defects; electromagnetic acoustic transducers (EMATs); cross-hole tomography imaging (CMI)

Share and Cite

MDPI and ACS Style

Huang, S.; Zhang, Y.; Wang, S.; Zhao, W. Multi-Mode Electromagnetic Ultrasonic Lamb Wave Tomography Imaging for Variable-Depth Defects in Metal Plates. Sensors 2016, 16, 628. https://doi.org/10.3390/s16050628

AMA Style

Huang S, Zhang Y, Wang S, Zhao W. Multi-Mode Electromagnetic Ultrasonic Lamb Wave Tomography Imaging for Variable-Depth Defects in Metal Plates. Sensors. 2016; 16(5):628. https://doi.org/10.3390/s16050628

Chicago/Turabian Style

Huang, Songling, Yu Zhang, Shen Wang, and Wei Zhao. 2016. "Multi-Mode Electromagnetic Ultrasonic Lamb Wave Tomography Imaging for Variable-Depth Defects in Metal Plates" Sensors 16, no. 5: 628. https://doi.org/10.3390/s16050628

APA Style

Huang, S., Zhang, Y., Wang, S., & Zhao, W. (2016). Multi-Mode Electromagnetic Ultrasonic Lamb Wave Tomography Imaging for Variable-Depth Defects in Metal Plates. Sensors, 16(5), 628. https://doi.org/10.3390/s16050628

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

Article Metrics

Back to TopTop