Detection and quantification of underground CO2 leakage into the soil using a fiber-optic sensor

Hang Eun Joe, Fengfeng Zhou, Seong Taek Yun, Martin B.G. Jun

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


This study presents a field demonstration of underground CO2 leakage detection using a fiber-optic interferometric sensor at an artificial leakage experiment site. CO2 gas was injected for a couple of days into the unsaturated soil zone and CO2 leakage monitoring was continuously performed for nine days using the fiber-optic sensor buried in the soil, using a hollow core photonic crystal fiber (HC-PCF) based sensor. Temperature and relative humidity in the soil were simultaneously measured by the commercial sensors. The measurement results of the HC-PCF sensor were evaluated by comparing with those by the commercial non-dispersive infrared sensor. This comparison illustrated that the proposed HC–PCF sensor was able to in-situ monitor CO2 gas concentration with a range of 0–100%. Accordingly, the proposed fiber-optic sensor has the potentials to provide a reliable assessment of CO2 gas leakage in geologic carbon storage sites and other gas leaking sites.

Original languageEnglish
Article number102375
JournalOptical Fiber Technology
Publication statusPublished - 2020 Dec

Bibliographical note

Publisher Copyright:
© 2020 Elsevier Inc.


  • CO concentration measurement
  • Carbon dioxide capture and storage
  • Fiber-optic spectroscopy
  • Hollow core fiber
  • Optical fiber sensor
  • Photonic crystal fiber

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Electrical and Electronic Engineering


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