Fiber optic moisture sensor

Details Fiber optic moisture sensor Fiber optic moisture sensor

1994-02-25

1995-08-15

Raevis, Robert

Measuring and testing

Gas analysis

Moisture content or vapor pressure

250365, 2504581, G01N 300

Patent

active

054409276

ABSTRACT:
This invention provides for a fiber optic moisture sensor. The sensor is comprised of a housing and a support positioned within the housing. The support is coated with a film. A first and second light guides are positioned within the housing and communicate illumination to and from the film. A reflective surface is positioned within the housing facing the film. The film comprises an optically transparent polymer and a salt complex of a metal ion and an organic compound. The salt complex is capable of absorbing moisture and emits a fluorescence signal when excited by light at the appropriate wavelength. The fluorescence signal can be quenched when the salt complex absorbs moisture. An apparatus incorporating the sensor and a method of making the sensor are also provided.

REFERENCES:
patent: 4173432 (1992-12-01), Lefkowitz et al.
patent: 4749856 (1988-06-01), Walker et al.
patent: 4988212 (1991-01-01), Sun et al.
patent: 5043285 (1991-08-01), Surgi
patent: 5319975 (1994-06-01), Pederson et al.

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