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Title: L-band CYTOP Bragg gratings for ultrasound sensing
Authors: Broadway, Christian 
Kalli, Kyriacos 
Theodosiou, Antreas 
Zubel, Michal 
Sugden, Kate 
Megret, Patrice 
Caucheteur, Christophe 
Keywords: Biomedical applications;CYTOP;Fibre Bragg gratings;Fibre sensors;Polymer optical fibre;Ultrasound detection
Category: Materials Engineering
Field: Engineering and Technology
Issue Date: 25-Apr-2018
Source: Proceedings of SPIE - The International Society for Optical Engineering, 10681, art. no. 1068109; Micro-Structured and Specialty Optical Fibres V, 2018, 25-26 April, Strasbourg, France
Journal: Proceedings of SPIE - The International Society for Optical Engineering 
Conference: Micro-Structured and Specialty Optical Fibres V 
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.
ISBN: 978-151061888-6
ISSN: 0277-786X
DOI: 10.1117/12.2307129
Rights: © 2018 SPIE.
Type: Conference Papers
Appears in Collections:Δημοσιεύσεις σε συνέδρια/Conference papers

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