Raman Analysis of Common Gases Using a Multi-Pass Capillary Cell (MCC)

Christopher M. Gordon, William F. Pearman, J. Chance Carter, James W Chan, S. Michael Angel

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

2 Scopus citations


The Raman analysis of common, non-absorbing gases was performed using an 18@1 fiber-optic probe coupled to a multi-pass capillary cell (MCC) for signal enhancement. The MCC is fabricated by metal-coating, using silver or other highly reflective metals, the inside of a 1-2 mm diameter glass capillary using commercially available silvering solutions and provides enhancements up to 30-fold over measurements using the fiber-optic probe alone. The design of the MCC is simple and the device is easy to incorporate into an experimental setup making it suitable for remote and in-situ analysis. Although the MCC is functionally similar to liquid-core waveguides that have been previously described in the literature, the MCC is not based on total internal reflection and so the refractive index of the analyte is not important to the operation of the device. The principle of operation of the MCC is similar to mirror-based multiple pass Raman cells, however, the MCC is not expensive, alignment is trivial and an optical path length up to several meters in length is possible. With our first-generation silver-coated MCCs, limits of detection were determined to be 0.02% and 0.2% for CH4 and CO2 respectively. In this talk we will discuss optimization of the MCC and issues involved in its use.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2008
Externally publishedYes
EventNovel Optical Systems Design and Optimization XI - San Diego, CA, United States
Duration: Aug 10 2008Aug 14 2008


OtherNovel Optical Systems Design and Optimization XI
Country/TerritoryUnited States
CitySan Diego, CA


  • Raman scattering
  • Raman spectroscopy
  • Waveguides

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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