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Analysis of disturbance-induced 'virtual' perturbations in chirped pulse φ-OTDR
- Source :
- IEEE Photonics Technology Letters, e_Buah Biblioteca Digital Universidad de Alcalá, instname
- Publication Year :
- 2019
-
Abstract
- When a disturbance acts on a fiber it induces a change in the local refractive index that influences the fiber backscattering trace. If a chirped pulse φ-OTDR setup is used to interrogate the fiber, this refractive index change appears as a local shift of the received trace, linear to the acting perturbation. However, the refractive index change influences the round trip time of all the backscattering components generated by further fiber sections as well. Due to the high sensitivity of chirped pulse φ-OTDR, the change in the round trip time of the backscattering components, which is usually negligible, may appear as a virtual perturbation in certain conditions. In this letter we derive a mathematical model for the virtual perturbation induced by a disturbance acting on the fiber, when the measurement is performed by a chirped pulse φ-OTDR. We experimentally validate the model by inducing a temperatura change on a known span of fiber while monitoring its effects in a further fiber section kept at rest. The experimental results are then analyzed and compared with the theoretical ones.<br />European Commission<br />Ministerio de Economía y Competitividad<br />Agencia Estatal de Investigación<br />Comunidad de Madrid
- Subjects :
- Physics::Optics
Perturbation (astronomy)
02 engineering and technology
Round-trip delay time
Optical time-domain reflectometer
Rayleigh scattering
01 natural sciences
010309 optics
symbols.namesake
020210 optoelectronics & photonics
Optics
0103 physical sciences
0202 electrical engineering, electronic engineering, information engineering
Electrical and Electronic Engineering
A fibers
Physics
Distributed acoustic sensing
phase-sensitive optical time domain reflectometry
rayleigh scattering
business.industry
Distributed Acoustic Sensing
Phase-sensitive Optical Time Domain Reflectometry
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials
symbols
Electrónica
sense organs
Electronics
business
Refractive index
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- IEEE Photonics Technology Letters, e_Buah Biblioteca Digital Universidad de Alcalá, instname
- Accession number :
- edsair.doi.dedup.....4b47483468f6c4d0d15aaa2a40389aac