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Strain monitoring using distributed Rayleigh sensing
Author(s): Roger Crickmore; Alastair Godfrey; Chris Minto
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Paper Abstract

Rayleigh Backscatter has been used for many years as the source signal for fibre optic distributed acoustic sensing (DAS) in many industrial and civilian activities such as situational information monitoring and down-hole hydrocarbon exploitation. The signal from a DRS system is affected by temperature, strain and acoustics/vibrations. The very low frequency content representing temperature and strain contributions has historically been overlooked in favour of the higher frequency acoustic content. In this paper we describe the potential of a quantitative DRS system to deliver low frequency strain monitoring together with an understanding of the degree of thermal coupling to the system which allows useful results. A long term (50 day) measurement using a quantitative DRS system was carried out to investigate how much drift there was in the system and demonstrate a compensation approach. An example of strain monitoring in a novel pipeline system is illustrated to show the degree of measurement resolution deliverable as compared to conventional strain gauges.

Paper Details

Date Published: 28 August 2019
PDF: 4 pages
Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 111991U (28 August 2019); doi: 10.1117/12.2539661
Show Author Affiliations
Roger Crickmore, OptaSense Ltd. (United Kingdom)
Alastair Godfrey, OptaSense Ltd. (United Kingdom)
Chris Minto, OptaSense Ltd. (United Kingdom)


Published in SPIE Proceedings Vol. 11199:
Seventh European Workshop on Optical Fibre Sensors
Kyriacos Kalli; Sinead O. O'Keeffe; Gilberto Brambilla, Editor(s)

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