Skip to Main content Skip to Navigation
Theses

Solutions aux limites des interrogateurs B-OTDR pour la surveillance d'infrastructures : augmentation de la portée de mesure et décorrélation des paramètres de température et de déformation

Abstract : This thesis deals with distributed optical fiber sensors, especially Brillouin sensors called B-OTDR that are sensitive both to temperature and strain. Some actual limitations due to the scattering phenomenon avoid deployment of this technology for some specific applications. These limitations are about the maximum length measured by the sensor but also the double sensitivity to strain and temperature. From our current B-OTDR sensor, we propose solutions to address these issues.A new re-amplification module using EDFA has been developed and characterized associated to a B-OTDR system. A 150 km distributed temperature measurement with 1,5 °C repeatability has been reached. This record performance let us consider a deployment for very long infrastructure monitoring for the energy transport. In another hand, we developed a new sensing device using Brillouin scattering and able to separate temperature and strain. This patented device has been characterized and used on a specific cable inserted in a well drilling. Results have shown a combination of strain and temperature variations on the cable that give very useful information to the well operator. We have reached a temperature repeatability of 1 °C and a strain repeatability of 20 μm/m for 1 km fiber. At 10 km, temperature repeatability has been evaluated to be 3 °C and strain to 75 μm/m. These results are to the state of art for temperature/strain separation using B-OTDR.These works have led to a new distributed measurement prototype that could address simultaneously temperature, strain, acoustic vibrations, and pressure sensing. Some interesting perspectives could result from these works to address a complete infrastructure monitoring using fiber optic sensing.
Document type :
Theses
Complete list of metadata

https://tel.archives-ouvertes.fr/tel-03200750
Contributor : Abes Star :  Contact
Submitted on : Friday, April 16, 2021 - 5:45:09 PM
Last modification on : Monday, April 19, 2021 - 8:38:11 PM

File

84914_CLEMENT_2020_diffusion.p...
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-03200750, version 1

Collections

Citation

Pierre Clement. Solutions aux limites des interrogateurs B-OTDR pour la surveillance d'infrastructures : augmentation de la portée de mesure et décorrélation des paramètres de température et de déformation. Optique / photonique. Institut Polytechnique de Paris, 2020. Français. ⟨NNT : 2020IPPAT042⟩. ⟨tel-03200750⟩

Share

Metrics

Record views

99

Files downloads

24