Long capillary waveguide raman cell
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United States of America Patent
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Feb 18, 1997
Grant Date -
N/A
app pub date -
Nov 16, 1995
filing date -
Nov 16, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The chemical properties of an aqueous liquid, the liquid comprising a solvent having an index of refraction which is the same as or closely approaches that of water, are determined by Raman spectroscopy wherein a sample of the liquid is delivered into an optical waveguide. The waveguide is in the form of a capillary having a reflective surface defined by a material having a refractive index of less than 1.33. Excitation light is transmitted axially into the liquid at an end of the waveguide. The excitation light is transmitted the length of the waveguide, by reflection from the reflective surface, causing the fluid to emit Raman spectra. The Raman spectra is transmitted along the waveguide, collected and delivered to a spectrometer.
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