Remote tuneable diode laser spectroscopy (TDLS) via a 1W Raman source

D.M. Mitchell, K. Duffin, W. Johnstone

Research output: Contribution to journalArticle


We report a long-range near-IR methane sensor for inspection of natural gas collection, storage sites and pipeline networks. The principle is that a laser carrier beam is directed at the target surface across a test path and the backscatter from the surface is detected in a large Fresnel lens on the sensor. A Raman amplifier has been designed to amplify the TDLS optical signal generated by a 1650.95nm DFB laser diode to over 1W CW. Combining the high power output of the Raman amplifier and the highly sensitive TDLS technique, we may report 100ppm.m sensitivity at more than 100m.
Original languageEnglish
Pages (from-to)73560Y
JournalProceedings of SPIE the International Society for Optical Engineering
Publication statusPublished - 18 May 2009


  • natural gas collection
  • storage sites
  • pipeline networks
  • laser carrier beam
  • surface
  • Fresnel lens
  • sensor
  • Raman
  • optical signal
  • Raman amplifier
  • diode laser spectroscopy


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