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Proceedings Paper

Comparison of optical and piezoelectric integrating line detectors
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Paper Abstract

Currently two different types of integrating line sensors are used in photoacoustic tomography (PAT). Thin film piezoelectric polymer sensors (PVDF) are characterized by compactness, easy handling and the possibility to manufacture sensing areas with different shape. However, they are vulnerable to electrical disturbance and to scattered light from the illuminated sample. Also optical sensors are used as integrating line sensors in combination with some kind of interferometric setup. For example, one arm of a Mach-Zehnder interferometer or the cavity of a Fabry-Perot interferometer can be used as line detector. In both cases, the light wave either propagates freely in the liquid or is guided in an optical fiber. Such sensors are quite immune against noise sources described above and suitable for high bandwidth detection. One drawback is the limited mobility due to the complex arrangement of the setup. This study is focused on the comparison of the different implementations of line detectors, mainly on directivity and sensitivity. Shape and amplitude of signals generated by defined sources are compared among the various sensor types. While the shape of the signals recorded with the optical free beam detector matches quite well to the simulation the signals detected with the PVDF detector are affected by directivity effects. This causes a strong distortion of the signal shape depending on the incident angle of the acoustic wave. How these effects influence the reconstructed projection image is discussed.

Paper Details

Date Published: 24 February 2009
PDF: 8 pages
Proc. SPIE 7177, Photons Plus Ultrasound: Imaging and Sensing 2009, 71770T (24 February 2009); doi: 10.1117/12.808873
Show Author Affiliations
R. Nuster, Karl-Franzens-Univ. Graz (Austria)
S. Gratt, Karl-Franzens-Univ. Graz (Austria)
K. Passler, Karl-Franzens-Univ. Graz (Austria)
H. Grün, Upper Austrian Research GmbH (Austria)
Th. Berer, Upper Austrian Research GmbH (Austria)
P. Burgholzer, Upper Austrian Research GmbH (Austria)
G. Paltauf, Karl-Franzens-Univ. Graz (Austria)

Published in SPIE Proceedings Vol. 7177:
Photons Plus Ultrasound: Imaging and Sensing 2009
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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