Phasorial DPP-BOTDA sensor tolerant to non-local effects

Javier Urricelqui; Jon Mariñelarena; Mikel Sagues; Alayn Loayssa

doi:10.1117/12.2059068

2 June 2014 Phasorial DPP-BOTDA sensor tolerant to non-local effects

Javier Urricelqui, Jon Mariñelarena, Mikel Sagues, Alayn Loayssa

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.

Citation Download Citation

Javier Urricelqui, Jon Mariñelarena, Mikel Sagues, and 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); https://doi.org/10.1117/12.2059068

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