Chemical sensing techniques employing liquid-core optical fibers

Details Chemical sensing techniques employing liquid-core optical fibers Chemical sensing techniques employing liquid-core optical fibers

1998-04-06

2000-01-18

Lee, John D.

Optical waveguides

Optical waveguide sensor

385125, 25022718, G02B 620

Patent

active

060163720

ABSTRACT:
A gas or vapor permeable optical fiber waveguide with a liquid core is employed as a probe for the detection or measurement of a chemical specie of interest by filling the waveguide core region with a reagent liquid which undergoes a change in an optical characteristic thereof when exposed to the chemical specie and then inserting the filled waveguide into an environment in which the chemical specie may be present. The chemical specie, if present, will permeate through the waveguide wall and react with or be absorbed in the core liquid. Sensitivity is enhanced by controlling the pressure differential across the waveguide wall and/or by shaping the waveguide to enlarge the surface area. When the reaction generates light, the devices which detect that light will be shaped and disposed to maximize the collection thereof.

REFERENCES:
patent: 5444807 (1995-08-01), Liu
"Liquid-Core Waveguides for Chemical Sensing", SPIE vol. 2293, pp. 71-79, 1994.

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