L-band CYTOP Bragg gratings for ultrasound sensing


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: College of Engineering & Physical Sciences > School of Computer Science and Digital Technologies > Electronics & Computer Engineering
College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
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
ISBN: 9781510618886
Last Modified: 27 Jun 2024 12:28
Date Deposited: 20 Aug 2018 08:41
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
https://www.spi ... 12.2307129.full (Publisher URL)
PURE Output Type: Conference contribution
Published Date: 2018-05-09
Accepted Date: 2018-01-26
Authors: Broadway, Christian (ORCID Profile 0000-0003-1875-8859)
Kalli, Kyriacos
Theodosiou, Andreas
Zubel, Michal
Sugden, Kate (ORCID Profile 0000-0001-6323-1082)
Megret, Patrice
Caucheteur, Christophe



Version: Published Version

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