CODING METHODS FOR USE WITH LOW POWER LASER GENERATED ULTRASOUND

Journal Article · Mon Feb 22 00:00:00 EST 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3362404· OSTI ID:21371025

Cleary, A; Veres, I; Thursby, G; McKee, C; Pierce, S G; Culshaw, B

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.

• OSTI ID: 21371025
• Journal Information: AIP Conference Proceedings, Vol. 1211, Issue 1; Conference: Review of progress in quantitative nondestructive evaluation, Kingston, RI (United States), 26-31 Jul 2009; Other Information: DOI: 10.1063/1.3362404; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON MONOXIDE
CRYSTAL STRUCTURE
DATA PROCESSING
EXCITATION
MICROSTRUCTURE
PLATES
SEMICONDUCTOR LASERS
SIGNAL-TO-NOISE RATIO
ULTRASONIC TESTING
ULTRASONIC WAVES
ACOUSTIC TESTING
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
DIMENSIONLESS NUMBERS
ENERGY-LEVEL TRANSITIONS
LASERS
MATERIALS TESTING
NONDESTRUCTIVE TESTING
OXIDES
OXYGEN COMPOUNDS
PROCESSING
SEMICONDUCTOR DEVICES
SOLID STATE LASERS
SOUND WAVES
TESTING