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Proceedings Paper

Photoacoustic and ultrasound imaging with a gas-coupled laser acoustic line detector
Author(s): Jami L. Johnson; Kasper van Wijk; James N. Caron; Miriam Timmerman
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Paper Abstract

Conventional contacting transducers are highly sensitive and readily available for ultrasonic and photoacoustic imaging. On the other hand, optical detection can be advantageous when a small sensor footprint, large bandwidth and no contact are essential. However, most optical methods utilizing interferometry or Doppler vibrometry rely on the reflection of light from the object. We present a non-contact detection method for photoacoustic and ultrasound imaging--termed Gas-Coupled Laser Acoustic Detection (GCLAD)--that does not involve surface reflectivity. GCLAD measures the displacement along a line in the air parallel to the object. Information about point displacements along the line is lost with this method, but resolution is increased over techniques that utilize finite point-detectors when used as an integrating line detector. In this proceeding, we present a formula for quantifying surface displacement remotely with GCLAD. We will validate this result by comparison with a commercial vibrometer. Finally, we will present two-dimensional imaging results using GCLAD as a line detector for photoacoustic and laser-ultrasound imaging.

Paper Details

Date Published: 15 March 2016
PDF: 5 pages
Proc. SPIE 9708, Photons Plus Ultrasound: Imaging and Sensing 2016, 970814 (15 March 2016); doi: 10.1117/12.2211800
Show Author Affiliations
Jami L. Johnson, Univ. of Auckland (New Zealand)
Kasper van Wijk, Univ. of Auckland (New Zealand)
James N. Caron, Research Support Instruments (United States)
Miriam Timmerman, Univ. of Twente (Netherlands)

Published in SPIE Proceedings Vol. 9708:
Photons Plus Ultrasound: Imaging and Sensing 2016
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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