Projects per year
Abstract
We describe how the application of maximum-length sequence (m-sequence) coding can be used to improve the measured signal-to-noise ratio of ultrasonic waves generated by a low power laser diode. Lamb waves were generated in thin metallic plates using a pulsed excitation. To improve the signal-to-noise ratio of the detected signal, various signal processing methods have been evaluated, with m-sequences described here. We also show how the spectral content of the ultrasonic wave can be controlled by using a modified m-sequence approach
Original language | English |
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Pages | 271-278 |
Number of pages | 8 |
DOIs | |
Publication status | Published - Jul 2009 |
Event | 2010 Review of Progress in Quantitative Nondestructive Evaluation - Kingston, Rhode Island, United States Duration: 26 Jul 2010 → 31 Jul 2010 |
Conference
Conference | 2010 Review of Progress in Quantitative Nondestructive Evaluation |
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Country | United States |
City | Kingston, Rhode Island |
Period | 26/07/10 → 31/07/10 |
Keywords
- ultrasonic effects
- semiconductor lasers
- crystal microstructure
- signal processing
Projects
- 1 Finished
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PGII: Generation, Detection & Analysis of Optimally Coded Ultrasonic Waveforms
Gachagan, A., Hayward, G., Mulholland, A. & Pierce, G.
EPSRC (Engineering and Physical Sciences Research Council)
9/06/08 → 9/09/12
Project: Research