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Noncontact, high-resolution ultrasonic imaging of wood samples using coded chirp waveforms
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UNSPECIFIED (2005) Noncontact, high-resolution ultrasonic imaging of wood samples using coded chirp waveforms. IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, 52 (2). pp. 280-288. ISSN 0885-3010.
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Abstract
A noncontact ultrasonic inspection technique has been developed to study the properties of wood samples in air. The system makes use of two broad bandwidth capacitive transducers, combined with signal processing techniques. A coded chirp signal was used in the current application to provide a waveform that could be postprocessed to provide sufficient sensitivity for transmission across samples of wood. It will be shown in this paper that the signal-to-noise ratio (SNR) can be greatly improved using two signal recovery techniques, namely pulse compression and swept frequency multiplication (SFM). A simulation of both techniques is presented and compared to experimental data. As will be seen from the experimental results, it is possible to perform noncontact ultrasonic experiments to extract a range of useful information such as ring density and the presence of microcracks.
Item Type: | Journal Article | ||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Journal or Publication Title: | IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL | ||||
Publisher: | IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC | ||||
ISSN: | 0885-3010 | ||||
Official Date: | February 2005 | ||||
Dates: |
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Volume: | 52 | ||||
Number: | 2 | ||||
Number of Pages: | 9 | ||||
Page Range: | pp. 280-288 | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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