Fiber optic moisture sensor with moisture-absorbing reflective t

Details Fiber optic moisture sensor with moisture-absorbing reflective t Fiber optic moisture sensor with moisture-absorbing reflective t

1984-08-03

1987-01-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250557, H01J 516

Patent

active

046348565

ABSTRACT:
A method and apparatus for sensing moisture changes by utilizing optical fiber technology. One embodiment uses a reflective target at the end of an optical fiber. The reflectance of the target varies with its moisture content and can be detected by a remote unit at the opposite end of the fiber. A second embodiment utilizes changes in light loss along the fiber length. This can be attributed to changes in reflectance of cladding material as a function of its moisture content. It can also be affected by holes or inserts interposed in the cladding material and/or fiber. Changing light levels can also be coupled from one fiber to another in an assembly of fibers as a function of varying moisture content in their overlapping lengths of cladding material.

REFERENCES:
patent: 3120125 (1964-02-01), Vasel
patent: 4270049 (1981-05-01), Tanaka et al.
patent: 4422714 (1983-12-01), Benoit et al.

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