Low power laser generated ultrasound: signal processing for time domain data acquisition

A. Cleary, Istvan Veres, G.J. Thursby, C. McKee, I. Armstrong, S.G. Pierce, B. Culshaw

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Abstract

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.
Original languageEnglish
Publication statusPublished - 2010
EventLaser Ultrasonics 2010 - Bordeaux, France
Duration: 5 Jul 20108 Jul 2010

Conference

ConferenceLaser Ultrasonics 2010
CityBordeaux, France
Period5/07/108/07/10

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Keywords

  • ultrasonics
  • lasers
  • ultrasound
  • low power
  • laser generated ultrasound
  • signal processing
  • time domain
  • data acquisition

Cite this

Cleary, A., Veres, I., Thursby, G. J., McKee, C., Armstrong, I., Pierce, S. G., & Culshaw, B. (2010). Low power laser generated ultrasound: signal processing for time domain data acquisition. Paper presented at Laser Ultrasonics 2010, Bordeaux, France, .