Comparison of three types of fiber optic sensors for temperature monitoring in a groundwater flow simulator

Sandra Drusová*, Wiecher Bakx, Pieter J. Doornenbal, R. Martijn Wagterveld, Victor F. Bense, Herman L. Offerhaus

*Corresponding author for this work

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Abstract

Different fiber optic sensors have been used for groundwater temperature monitoring and the question is which one to choose for a particular study. In the field conditions it is sometimes difficult to determine how much error is introduced by the sensor placement technique, packaging or cross-sensitivity between temperature and strain. These factors were studied in a laboratory groundwater simulator during a heat tracing experiment. The performance of three fiber optic technologies was evaluated – distributed temperature sensing, fiber Bragg gratings and continuous fiber Bragg gratings. All sensors had comparable accuracy of around 0.2 °C and resolution smaller than 0.1 °C. Therefore, factors which need to be considered when choosing a sensor for groundwater temperature monitoring are spatial resolution, sampling frequency and possibility to measure absolute/relative temperature. The experiment also showed that strain effects can be introduced even when fibers have a loose tube packaging.

Original languageEnglish
Article number112682
JournalSensors and Actuators, A: Physical
Volume331
Early online date17 Mar 2021
DOIs
Publication statusE-pub ahead of print/First online - 17 Mar 2021

Keywords

  • Continuous fiber Bragg grating
  • Distributed temperature sensing
  • Fiber Bragg grating
  • Groundwater temperature
  • Packaging
  • Strain
  • UT-Hybrid-D

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