This report documents the development and subsequent field testing of two rapid response instruments for the detection of methane gas in the vapor resulting from an LNG spill. The instruments were: a laser instrument with a 0.005 second response time and 0.1% sensitivity, and a two-band differential radiometer (TBDR) with a 0.15 second response time and 1% sensitivity. A thermistor sensor was also developed for the rapid (0.2 second) measurement of vapor temperature. The implementation of this instrumentation for Spill Tests LNG-18, LNG-19, LNG-20 and LNG-21 at China Lake, California is also described in this report. Some comparisons were made between the JPL measurements and those of other organizations involved in the China Lake test program. Good correlation was found, for example, between the laser methane measurement and that of a nearby sensor during LNG-18. During LNG-21 the vapor temperature of methane was also measured and found to be linearly related to the methane concentration over the 2-10% range. In addition to the two methane concentration instruments, progress in the laboratory associated with this program was made on the development of a modified TBDR device to measure the concentration of oxygen in the vapor cloud, and in the development of infrared fiber-optics for advanced laser detection of methane and other species. (Author)

  • Corporate Authors:

    Jet Propulsion Laboratory

    California Institute of Technology, 4800 Oak Grove Drive
    Pasadena, CA  United States  91103

    United States Coast Guard

    2100 Second Street, SW
    Washington, DC  United States  20593
  • Authors:
    • Hinckley, E D
  • Publication Date: 1979-3-31

Media Info

  • Pagination: 85 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00305848
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: USCG-D-71-79 Final Rpt.
  • Contract Numbers: DOT-CG-822868-A
  • Files: TRIS
  • Created Date: Mar 31 1980 12:00AM