Dynamic distributed measurement of temperature changes using phase-sensitive OTDR with chirped pulses

Juan Pastor-Graells; Hugo F. Martins; Andres Garcia-Ruiz; Sonia Martin-Lopez; Miguel Gonzalez-Herraez

doi:10.1117/12.2236192

30 May 2016 Dynamic distributed measurement of temperature changes using phase-sensitive OTDR with chirped pulses

Juan Pastor-Graells, Hugo F. Martins, Andres Garcia-Ruiz, Sonia Martin-Lopez, Miguel Gonzalez-Herraez

Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 99162Q (2016) https://doi.org/10.1117/12.2236192
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland

Abstract

A new and simple distributed fiber sensor which allows for the dynamic (single-shot) and quantitative measurement of perturbations is presented. It is based on a phase-sensitive OTDR using direct detection and linearly chirped pulses. Perturbations result in longitudinal shifts of the fiber trace, which can be calculated using a local correlation. As a proof of concept, distributed temperature variations of up to 5 Kelvin with millikelvin temperature resolutions over several minutes are demonstrated. Since the technique does not require a frequency sweep, operation ranging from dynamic strain measurements at kHz rates to temperature monitoring over several hours is readily envisaged.

Citation Download Citation

Juan Pastor-Graells, Hugo F. Martins, Andres Garcia-Ruiz, Sonia Martin-Lopez, and Miguel Gonzalez-Herraez "Dynamic distributed measurement of temperature changes using phase-sensitive OTDR with chirped pulses", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99162Q (30 May 2016); https://doi.org/10.1117/12.2236192

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