Fiber optics gas sensor

Details Fiber optics gas sensor Fiber optics gas sensor

1993-04-13

1995-07-25

Warden, Robert J.

Chemistry: analytical and immunological testing

Optical result

With claimed manipulation of container to effect reaction or...

385 12, 385128, 422 8205, 422 8211, 422 83, 422 88, 422 91, 436167, G01N 2103

Patent

active

054361672

ABSTRACT:
The adsorption of gas on a solid surface can produce considerable variation in the optical properties of the solid surface and eventually lead to the identification of the gas adsorbed. An optical waveguide having at least a portion of its length circumferentially coated with a transparent semiconductor material may function as a gas sensor. The sensor functions by exchanging electrons with a detectable gas brought in proximity with the coating material at reactive sites on the material's surface by the process of adsorption, thereby varying the refractive index of the transparent semiconductor material and altering the ellipticity of a light transmission through the optical waveguide. Substantially monochromatic polarized light is transmitted through the optical waveguide and then quantified by a light detector. A meter or other device connected to the light detector is adjusted to register a variation in the signal received by the light detector, indicating the presence of a detectable gas.

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