L-band CYTOP Bragg gratings for ultrasound sensing

Broadway, Christian, Kalli, Kyriacos, Theodosiou, Andreas, Zubel, Michal, Sugden, Kate, Megret, Patrice and Caucheteur, Christophe (2018). L-band CYTOP Bragg gratings for ultrasound sensing. IN: Micro-Structured and Specialty Optical Fibres V. Proceedings of SPIE, 10681 . SPIE.

Abstract

Polymer optical fibre (POF) has been receiving increasing attention for sensing applications. The fundamental properties of POF such as PMMA deliver at least an order of magnitude in improvements over silica fibres, though practical difficulties create additional complexity. POF has the potential to deliver lower acoustic impedance, a reduced Young's Modulus and a higher acoustic sensitivity within the megahertz region. In contrast, existing piezo-electric transducers have an inherent narrow acoustic bandwidth and a proportionality to size that causes difficulties for applications such as endoscopy within the biomedical domain. POF generally suffers high attenuation per kilometre at telecommunications wavelengths, limiting fibre lengths to mere centimetres. However, CYTOP, a graded index perfluorinated polymer, is a commercially certified product allowing the use of telecoms region technology and tens of meters of fibre without exceeding acceptable losses. With an effective refractive index between 1.32 and 1.33, it is fundamentally better placed for applications using water or a similar media for acoustic coupling. We demonstrate ultrasonic detection at 5,10 and 15 MHz using a TFBG within a CYTOP fibre in the telecoms region and the latest knowledge in POF handling and connectorisation. This first step in the use of CYTOP demonstrates the viability of the sensor and paves the way towards further advances towards its eventual application.

Publication DOI: https://doi.org/10.1117/12.2307129
Divisions: Engineering & Applied Sciences
Engineering & Applied Sciences > Electrical, electronic & power engineering
Engineering & Applied Sciences > Institute of Photonics
Additional Information: Copyright 2018 SPIE. One print or electronic copy may be made for personal use only. Systematic reproduction, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Event Title: Micro-Structured and Specialty Optical Fibres V 2018
Event Type: Other
Event Dates: 2018-04-25 - 2018-04-26
Uncontrolled Keywords: biomedical applications,CYTOP,fibre Bragg gratings,fibre sensors,Polymer optical fibre,ultrasound detection,Electronic, Optical and Magnetic Materials,Condensed Matter Physics,Computer Science Applications,Applied Mathematics,Electrical and Electronic Engineering
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
https://www.spi ... 12.2307129.full (Publisher URL)
Published Date: 2018-05-09
Authors: Broadway, Christian
Kalli, Kyriacos
Theodosiou, Andreas
Zubel, Michal
Sugden, Kate ( 0000-0001-6323-1082)
Megret, Patrice
Caucheteur, Christophe

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