Continuous underground monitoring of gas leaks

Gamal E. Khalil, Fletcher Kimura, Alice Chin, Masoud Ghandehari, River Wan, Wayne Shinoki, Martin Gouterman, James B. Callis, Larry R. Dalton

Research output: Contribution to journalArticlepeer-review


A gas-leak-detection system was designed based on the concept of oxygen-level measurement. Optical fibers were produced with gas-permeable polymeric cladding material doped with oxygen-responsive porphyrin sensor molecules and subsequently interrogated via the evanescent field along the fiber length. Tests were performed with simulated methane-gas leaks in air and under dry and saturated sand. Results of sensor sensitivity, response time, and reversibility are presented.

Original languageEnglish (US)
Pages (from-to)119-130
Number of pages12
JournalResearch in Nondestructive Evaluation
Issue number3
StatePublished - Jul 2005


  • Evanescent field
  • Gas pipeline
  • Health monitoring
  • Leak detection
  • Optical fiber sensors
  • Porphyrin

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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