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Proceedings Paper

Microstructured polymer optical fibre sensors for opto-acoustic endoscopy
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Paper Abstract

Opto-acoustic imaging is a growing field of research in recent years, providing functional imaging of physiological biomarkers, such as the oxygenation of haemoglobin. Piezo electric transducers are the industry standard detector for ultrasonics, but their limited bandwidth, susceptibility to electromagnetic interference and their inversely proportional sensitivity to size all affect the detector performance. Sensors based on polymer optical fibres (POF) are immune to electromagnetic interference, have lower acoustic impedance and a reduced Young’s Modulus compared to silica fibres. Furthermore, POF enables the possibility of a wideband sensor and a size appropriate to endoscopy. Micro-structured POF (mPOF) used in an interferometric detector has been shown to be an order of magnitude more sensitive than silica fibre at 1 MHz and 3 times more sensitive at 10 MHz. We present the first opto-acoustic measurements obtained using a 4.7mm PMMA mPOF Bragg grating with a fibre diameter of 130 μm and present the lateral directivity pattern of a PMMA mPOF FBG ultrasound sensor over a frequency range of 1-50 MHz. We discuss the impact of the pattern with respect to the targeted application and draw conclusions on how to mitigate the problems encountered.

Paper Details

Date Published: 27 April 2016
PDF: 6 pages
Proc. SPIE 9886, Micro-Structured and Specialty Optical Fibres IV, 98860S (27 April 2016); doi: 10.1117/12.2227588
Show Author Affiliations
Christian Broadway, Univ. Carlos III de Madrid (Spain)
Daniel Gallego, Univ. Carlos III de Madrid (Spain)
Andreas Pospori, Aston Univ. (United Kingdom)
Michal Zubel, Aston Univ. (United Kingdom)
David J. Webb, Aston Univ. (United Kingdom)
Kate Sugden, Aston Univ. (United Kingdom)
Guillermo Carpintero, Univ. Carlos III de Madrid (Spain)
Horacio Lamela, Univ. Carlos III de Madrid (Spain)

Published in SPIE Proceedings Vol. 9886:
Micro-Structured and Specialty Optical Fibres IV
Kyriacos Kalli; Alexis Mendez, Editor(s)

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