Optical waveguide vapor sensor

Details Optical waveguide vapor sensor Optical waveguide vapor sensor

1992-03-09

1994-05-24

Bovernick, Rodney B.

Optical waveguides

Optical waveguide sensor

385145, G02B 602

Patent

active

053156730

ABSTRACT:
An optical waveguide sensor for the detection of acid vapors comprises a chemically sensitive reagent coating of bromothymol blue or thymol blue indicator suspended in a Nafion polymer film. The sensor uses a 562-nm light-emitting diode source and a phototransistor detector. The response to HCl and H.sub.2 S vapors is both rapid and reversible, with an estimated detection limit for H.sub.2 S of less than 15 ppmv (parts per million by volume). The sensor exhibits generalized response to protonic acid vapors, but does not produce an indicator response to CO.sub.2, even at large concentrations (60 volume-%) in the presence of water vapor. The sensor exhibits a systematic interference from water vapor which may be corrected by a differential approach, either using a reference sensor (Nafion without an indicator) or by monitoring the sensor responses at two wavelengths.

REFERENCES:
patent: 4834497 (1989-05-01), Angel
patent: 4846548 (1989-07-01), Klainer
patent: 5045282 (1991-09-01), Kritzman et al.
patent: 5082632 (1992-01-01), Partin et al.
patent: 5094517 (1992-03-01), Franke

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