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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/14339
Title: Sensors for Harsh Environment: Radiation Resistant FBG Sensor System
Authors: Pal A.
Dhar A.
Ghosh A.
Sen R.
Hooda B.
Rastogi, Vipul K.
Ams M.
Fabian M.
Sun T.
Grattan K.T.V.
Published in: Journal of Lightwave Technology
Abstract: This paper presents radiation resistant characteristics of fibre Bragg grating (FBG) sensors written in a photosensitive fiber and connected to a silica core radiation resistant optical fibre, aiming to develop a sensor system suitable for both sensing and data transmission in harsh environment. The silica core fluorine-down-doped clad optical fibre has been specifically designed and fabricated for this study using the modified chemical vapor deposition technique. Key waveguide parameters, including the width of the fluorine doped inner cladding have been optimized to obtain a low loss (<0.2 dB/km) at the operating wavelength region of 1550 nm. The fibre fabrication process, mainly the deposition condition, has also been optimized to achieve smooth deposition and sintering of silica core layers, to minimize radiation induced absorption. As a result, radiation induced absorption of ∼2.2 dB/km at 1550 nm under accumulated dose of 25 MRad at dose rate of 0.39 MRad/hr has been successfully achieved. To create an effective sensor system for harsh environmental conditions, this specialty fibre is connected to a number of FBGs (sensors) fabricated in photosensitive fibres prior to their extensive evaluations by being exposed to different accumulated dose of gamma radiation. Their corresponding Bragg wavelength shifts (BWS) and peak amplitudes were continuously monitored. It was found that the radiation induced BWS can be greatly reduced by shielding the sensors using stainless steel tubing. The temperature sensitivity and peak amplitude were found to be largely unchanged before and after exposure to Gamma radiation of 25 MRad which shows their potential use for temperature measurements in radiation environments with an uncertainty of around 0.1 °C. © 1983-2012 IEEE.
Citation: Journal of Lightwave Technology (2017), 35(16): 3393-3398
URI: https://doi.org/10.1109/JLT.2016.2598666
http://repository.iitr.ac.in/handle/123456789/14339
Issue Date: 2017
Publisher: Institute of Electrical and Electronics Engineers Inc.
Keywords: Fibre Bragg gratings
Gamma-ray effects
optical fibre
optical sensors
radiation effects
sensor system
silica core fibre
ISSN: 7338724
Author Scopus IDs: 24721620100
11941006600
35800937500
56456742900
55838722000
7006364661
14055434500
26767694400
56850764900
57203080984
Author Affiliations: Pal, A., Fibre Optics and Photonics Division, CSIR, Central Glass and Ceramic Research Institute, Kolkata, 700032, India
Dhar, A., Fibre Optics and Photonics Division, CSIR, Central Glass and Ceramic Research Institute, Kolkata, 700032, India
Ghosh, A., Fibre Optics and Photonics Division, CSIR, Central Glass and Ceramic Research Institute, Kolkata, 700032, India
Sen, R., Fibre Optics and Photonics Division, CSIR, Central Glass and Ceramic Research Institute, Kolkata, 700032, India
Hooda, B., Indian Institute of Roorkee, Roorkee, 247667, India
Rastogi, V., Indian Institute of Roorkee, Roorkee, 247667, India
Ams, M., Macquarie University, Sydney, NSW 2109, Australia
Fabian, M., City University London, London, EC1V 0BH, United Kingdom
Sun, T., City University London, London, EC1V 0BH, United Kingdom
Grattan, K.T.V., City University London, London, EC1V 0BH, United Kingdom
Funding Details: Manuscript received May 31, 2016; revised July 8, 2016; accepted July 21, 2016. Date of publication August 9, 2016; date of current version June 24, 2017. This work was supported by CSIR, India, and UKIERI, and by the Bioceramic Division, CSIR-CGCRI. The work of K. T. V. Grattan was supported by the Royal Academy of Engineering and the George Daniels Educational Trust.
Appears in Collections:Journal Publications [PH]

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