Environmental and physical parameter sensors incorporating polym

Details Environmental and physical parameter sensors incorporating polym Environmental and physical parameter sensors incorporating polym

1993-06-21

1994-08-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25022718, H01J 516

Patent

active

053430379

ABSTRACT:
An apparatus for detecting presence of a measurand includes a measurand sensitive layer overlying a fiber field access block. The fiber field access block has a clad fiber positioned such that a portion of the fiber is exposed to the measurand sensitive layer and any cladding on that portion of the fiber is thinner than required to prevent an evanescent wave from escaping the fiber. An optical source and an optical detection component are coupled to the fiber. Changes in the measurand sensitive layer, which are caused by interaction with the measurand, alter the phase velocity matching conditions of the fiber and measurand sensitive layer and can be measured by evaluating shifts in the output signals resulting from presence of the measurand.

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