Chemistry: analytical and immunological testing – Hydrocarbon – Acyclic
Patent
1985-03-07
1987-11-24
Richman, Barry S.
Chemistry: analytical and immunological testing
Hydrocarbon
Acyclic
250227, 350 9615, 350 9618, 350 9632, 356445, 422 68, 422 83, 436164, 436181, G01N 2117, G01N 2175
Patent
active
047089415
ABSTRACT:
A device for detecting small amounts of alkanes such as methane, ethane, propane, and butane gases, comprising an optical waveguide and a light source for propagating light therethrough; apparatus for obtaining samples of air to be tested; apparatus for adding water vapor to these air samples to yield gas mixtures with at least a 30% relative humidity; and means for flowing these mixtures over the surface of the optical waveguide at a rate sufficient to favor condensation of the mixture on the waveguide surface to thereby form a thin film thereon. The presence of alkanes is determined by detecting the intensity of the light after propagation through the optical waveguide and then comparing that detected intensity to a reference. In a preferred embodiment, the optical waveguide is an optical glass capillary in which the surface is closed in a lens-like configuration at the detector end.
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Ellis William T.
Forrest John L.
Hill Jr. Robert J.
Kelly Brian C.
Richman Barry S.
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