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Sensors 2018, 18(2), 573; https://doi.org/10.3390/s18020573

Measurement of a 3D Ultrasonic Wavefield Using Pulsed Laser Holographic Microscopy for Ultrasonic Nondestructive Evaluation

1
School of Mechanical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
2
General Engineering Research Institute, Liverpool John Moores University, Liverpool L3 3AF, UK
3
School of Science, Xi’an University of Science and Technology, Xi’an 710054, China
*
Author to whom correspondence should be addressed.
Received: 11 January 2018 / Revised: 8 February 2018 / Accepted: 8 February 2018 / Published: 13 February 2018
(This article belongs to the Special Issue Optical Waveguide Based Sensors)
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Abstract

In ultrasonic array imaging, 3D ultrasonic wavefields are normally recorded by an ultrasonic piezo array transducer. Its performance is limited by the configuration and size of the array transducer. In this paper, a method based on digital holographic interferometry is proposed to record the 3D ultrasonic wavefields instead of the array transducer, and the measurement system consisting of a pulsed laser, ultrasonic excitation, and synchronization and control circuit is designed. A consecutive sequence of holograms of ultrasonic wavefields are recorded by the system. The interferograms are calculated from the recorded holograms at different time sequence. The amplitudes and phases of the transient ultrasonic wavefields are recovered from the interferograms by phase unwrapping. The consecutive sequence of transient ultrasonic wavefields are stacked together to generate 3D ultrasonic wavefields. Simulation and experiments are carried out to verify the proposed technique, and preliminary results are presented. View Full-Text
Keywords: digital holographic microscopy; CCD sensor; array transducer; ultrasonic wavefield; ultrasonic imaging digital holographic microscopy; CCD sensor; array transducer; ultrasonic wavefield; ultrasonic imaging
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Wang, X.; Zhang, G.-M.; Ma, H.; Zhang, Y.; Wang, D. Measurement of a 3D Ultrasonic Wavefield Using Pulsed Laser Holographic Microscopy for Ultrasonic Nondestructive Evaluation. Sensors 2018, 18, 573.

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