Sensor arrangement

Details Sensor arrangement Sensor arrangement

1996-07-05

1999-05-11

Ngo, Hung N.

Optical waveguides

Optical waveguide sensor

385140, 385145, G02B6/26

Patent

active

059036850

ABSTRACT:
A substance sensor comprises a single-mode optical fibre having a core and a cladding having a lower refractive index than that of the core. A sensor material extends within the cladding towards the core. A layer of cladding is left between the sensor material and the core. The thickness (t) of the layer is sufficiently small that the sensor material lies within the evanescent wave which occurs within the cladding when optical radiation is conducted through the core. The refractive index of the sensor material varies in the presence of a substance to be sensed over a range which extends above and below the refractive index of the cladding. When its refractive index is lower than that of the cladding the sensor material operates, as far as the radiation is concerned, similarly to the cladding. However, when the refractive index of the sensor material is higher than that of the cladding the sensor material couples out some of the radiation, thereby reducing the transmissivity of the fibre. The sensor material may be, for example, polyethylene oxide, in which case the arrangement operates as a humidity sensor.

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Sensors and Actuators A, vol. A23, No. 1/3, Apr. 1 1990, pp. 1092-1096, XP000355779 Poscio P et al.: "Realization of a Miniaturized Optical Sensor for Biomedical Applications" * The Whole Document*.
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