Detection of gas leaks in the subsurface environment

Masoud Ghandehari, Gamal Khalil, Fletcher Kimura

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Leaking valves, connections and distribution pipelines are significant sources of fugitive gas and volatile chemical emissions in chemical manufacturing, gas production, transmission, and oil refineries. A gas leak detection method has been developed based on continuous monitoring of the oxygen concentration surrounding a natural gas pipeline. The method utilizes optical fibers coated with an oxygen permeable polymeric film containing a luminescent sensor molecule. When the specialty fiber is illuminated by a light source that excites the luminophor, the functional cladding compound has the ability to detect and quantify leaks by measuring small changes in oxygen concentrations in the surrounding environment. Key features of the technology include long-term performance based on well understood platinum porphyrin chemistry, in addition to the capability of distributed sensing using fiber optic evanescent field spectroscopy. Results of leak detection in various environments namely atmospheric conditions, dry sand as well as saturated sand is reported, along with test results on long term system performance.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsA.A. Diaz, H.E. Aktan, H.F. Wu, S.R. Doctor, Y. Bar-Cohen
Number of pages8
StatePublished - 2005
EventNondestructive Detection and Measurement for Homeland Security III - San Diego, CA, United States
Duration: Mar 7 2005Mar 9 2005


OtherNondestructive Detection and Measurement for Homeland Security III
Country/TerritoryUnited States
CitySan Diego, CA

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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