2 June 2014 Phasorial DPP-BOTDA sensor tolerant to non-local effects
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Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 91575U (2014) https://doi.org/10.1117/12.2059068
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain
Abstract
We introduce a modification of the differential pulse-width pair technique in a BOTDA sensor based on a phase-modulated probe wave and RF demodulation. This provides a differential Brillouin phasorial signal with high spatial and spectral resolution in both components (magnitude and phase-shift). Moreover, the use of a phase-modulated probe wave provides RF phase-shift measurements tolerant to the emergence of non-local effects. The combination of both techniques can lead to the development of long-range BOTDA sensors. Proof-of-concept experiments demonstrate RF phase-shift measurements with 1m spatial resolution over 50km and an uncertainty of 1.3ºC at the worst contrast position.
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Javier Urricelqui, Javier Urricelqui, Jon Mariñelarena, Jon Mariñelarena, Mikel Sagues, Mikel Sagues, Alayn Loayssa, Alayn Loayssa, } "Phasorial DPP-BOTDA sensor tolerant to non-local effects", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91575U (2 June 2014); doi: 10.1117/12.2059068; https://doi.org/10.1117/12.2059068
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