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The use of low power modulated laser diode systems has previously been established as a suitable method for non-destructive laser generation of ultrasound. Using a quasi-continuous optical excitation amplified by an erbium-doped fibre amplifier (EDFA) allows flexible generation of ultrasonic waves, offering control of further parameters such as the frequency content or signal shape. In addition, pseudo-random binary sequences (PRBS) can be used to improve the detected impulse response. Here we compare two sequences, the m-sequence and the Golay code, and discuss the advantages and practical limits of their application with laser diode based optical excitation of ultrasound.
|Publication status||Published - 2010|
|Event||Laser Ultrasonics 2010 - Bordeaux, France|
Duration: 5 Jul 2010 → 8 Jul 2010
|Conference||Laser Ultrasonics 2010|
|Period||5/07/10 → 8/07/10|
- low power
- laser generated ultrasound
- signal processing
- time domain
- data acquisition
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- 1 Finished
9/06/08 → 9/09/12