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Title: Polymer PCF Bragg grating sensors based on poly(methyl methacrylate) and TOPAS cyclic olefin copolymer
Authors: Kalli, Kyriacos 
Webb, David J. 
Johnson, Ian P. 
Yuan, Wu 
Stefani, Alessio 
Nielsen, Kristian Fog Og 
Rasmussenc, Henrik K. 
Bang, Ole 
Keywords: Bragg gratings;Cadmium;Copolymers;Crystal whiskers;Esters;Fibers
Category: Industrial Biotechnology
Field: Engineering and Technology
Issue Date: Apr-2011
Publisher: Spie Digital Library
Source: (2011) Proceedings of SPIE - The International Society for Optical Engineering, 8073, art. no. 80732V; Optical Sensors 2011; and Photonic Crystal Fibers V; Prague; Czech Republic; 18 April 2011 through 20 April 2011
Journal: Proceedings of SPIE - The International Society for Optical Engineering 
Conference: SPIE Optics + Optoelectronics 
Abstract: Fibre Bragg grating (FBG) sensors have been fabricated in polymer photonic crystal fibre (PCF). Results are presented using two different types of polymer optical fibre (POF); first multimode PCF with a core diameter of 50μm based on poly(methyl methacrylate) (PMMA) and second, endlessly single mode PCF with a core diameter of 6μm based on TOPAS cyclic olefin copolymer. Bragg grating inscription was achieved using a 30mW continuous wave 325nm helium cadmium laser. Both TOPAS and PMMA fibre have a large attenuation of around 1dB/cm in the 1550nm spectral region, limiting fibre lengths to no longer than 10cm. However, both have improved attenuation of under 10dB/m in the 800nm spectral region, thus allowing for fibre lengths to be much longer. The focus of current research is to utilise the increased fibre length, widening the range of sensor applications. The Bragg wavelength shift of a grating fabricated in PMMA fibre at 827nm has been monitored whilst the POF is thermally annealed at 80 °C for 7 hours. The large length of POF enables real time monitoring of the grating, which demonstrates a permanent negative Bragg wavelength shift of 24nm during the 7 hours. This creates the possibility to manufacture multiplexed Bragg sensors in POF using a single phase mask in the UV inscription manufacturing. TOPAS holds certain advantages over PMMA including a much lower affinity for water, this should allow for the elimination of cross-sensitivity to humidity when monitoring temperature changes or axial strain, which is a significant concern when using PMMA fibre.
ISBN: 978-081948663-9
ISSN: 0277-786X
DOI: 10.1117/12.890090
Rights: © 2011 SPIE.
Type: Conference Papers
Appears in Collections:Κεφάλαια βιβλίων/Book chapters

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