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Application of pulse compression signal processing techniques to electromagnetic acoustic transducers for noncontact thickness measurements and imaging
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UNSPECIFIED (2005) Application of pulse compression signal processing techniques to electromagnetic acoustic transducers for noncontact thickness measurements and imaging. REVIEW OF SCIENTIFIC INSTRUMENTS, 76 (5). -. doi:10.1063/1.1899310 ISSN 0034-6748.
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Official URL: http://dx.doi.org/10.1063/1.1899310
Abstract
A pair of noncontact Electromagnetic Acoustic Transducers (EMATs) has been used for thickness measurements and imaging of metallic plates. This was performed using wide bandwidth EMATs and pulse-compression signal processing techniques, using chirp excitation. This gives a greatly improved signal-to-noise ratio for air-coupled experiments, increasing the speed of data acquisition. A numerical simulation of the technique has confirmed the performance. Experimental results indicate that it is possible to perform noncontact ultrasonic imaging and thickness gauging in a wide range of metal plates. An accuracy of up to 99% has been obtained for aluminum, brass, and copper samples. The resolution of the image obtained using the pulse compression approach was also improved compared to a transient pulse signal from conventional pulser/receiver. It is thus suggested that the combination of EMATs and pulse compression can lead to a wide range of online applications where fast time acquisition is required. © 2005 American Institute of Physics.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Journal or Publication Title: | REVIEW OF SCIENTIFIC INSTRUMENTS | ||||
Publisher: | AMER INST PHYSICS | ||||
ISSN: | 0034-6748 | ||||
Official Date: | May 2005 | ||||
Dates: |
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Volume: | 76 | ||||
Number: | 5 | ||||
Number of Pages: | 8 | ||||
Page Range: | - | ||||
DOI: | 10.1063/1.1899310 | ||||
Publication Status: | Published |
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