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Swept frequency multiplication (SFM) techniques for improved air-coupled ultrasonic NDE
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UNSPECIFIED (2003) Swept frequency multiplication (SFM) techniques for improved air-coupled ultrasonic NDE. In: 29th Annual Review of Progress in Quantitative Nondestructive Evaluation, JUL 14-19, 2002, WESTERN WASHINGTON UNIV, BELLINGHAM, WA.
Full text not available from this repository.Abstract
A new technique has been investigated for improving the signals that can be obtained in air-coupled NDE. This relies on the broad bandwidth available from polymer-filmed capacitive transducers. The technique relies on a swept-frequency "chirp" signal, which is transmitted from a transducer in air, passes through the sample under test, and is then detected at the far side using a separate receiver in through-transmission. The new technique differs from existing time-domain correlation techniques, such as pulse compression, in that a single multiplication process is performed in the time domain to give a difference frequency signal. This can then be easily isolated in the frequency domain. It will be demonstrated that this new Swept Frequency Multiplication (SFM) approach gives excellent resolution between overlapping signals, and indeed has several potential advantages over pulse compression. Examples will be shown of air-coupled images, obtained using SFM processing, which demonstrate the wide application of the technique to air-coupled NDE.
| Item Type: | Conference Item (UNSPECIFIED) |
|---|---|
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering Q Science > QC Physics |
| Series Name: | REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION |
| Journal or Publication Title: | REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 22A AND 22B |
| Publisher: | AMER INST PHYSICS |
| ISBN: | 0-7354-0117-9 |
| Editor: | Thompson, DO and Chimenti, DE |
| Date: | 2003 |
| Volume: | 20 |
| Number: | Part A&B |
| Number of Pages: | 8 |
| Page Range: | pp. 620-627 |
| Publication Status: | Published |
| Title of Event: | 29th Annual Review of Progress in Quantitative Nondestructive Evaluation |
| Location of Event: | WESTERN WASHINGTON UNIV, BELLINGHAM, WA |
| Date(s) of Event: | JUL 14-19, 2002 |
| URI: | http://wrap.warwick.ac.uk/id/eprint/9018 |
Data sourced from Thomson Reuters' Web of Knowledge
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