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 |
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Keywords
- ultrasonic effects
- semiconductor lasers
- crystal microstructure
- signal processing
Cite this
Cleary, A., Veres, I. A., Thursby, G. J., McKee, C., Pierce, S. G., & Culshaw, B. (2009). Coding methods for low power laser generation of ultrasound. 271-278. Paper presented at 2010 Review of Progress in Quantitative Nondestructive Evaluation, Kingston, Rhode Island, United States. https://doi.org/10.1063/1.3362404