Optical fibers and fluorosensors having improved power efficienc

Details Optical fibers and fluorosensors having improved power efficienc Optical fibers and fluorosensors having improved power efficienc

1991-09-16

1993-11-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

385 12, G01N 2100

Patent

active

052626385

ABSTRACT:
An optical fiber fluorosensor is provided having a portion of a fiber core which is surrounded by an active cladding which is permeable by the analyte to be sensed and containing substances which emit light waves upon excitation. A remaining portion of the fiber core is surrounded by a guide cladding which guides these light waves to a sensor which detects the intensity of waves, which is a function of the analyte concentration. Contrary to conventional weakly guiding principles, the difference between the respective indices of refraction of the fiber core and the cladding is greater than approximately 0.01. In an alternative embodiment, the fiber core is surrounded by an active cladding which is thin enough such that its index of refraction is effectively that of the surrounding atmosphere, whereby the atmosphere guides the injected light throughout the fiber core.

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