31 May 1999 Development of a novel fiber optic sensor for humidity monitoring
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This paper describes ongoing research into the development of a fiber optic sensor for humidity sensing. Particular attention is paid to the compatibility of this fiber optic sensor with an existing system which is already in use for structural deformation monitoring. In order to achieve this, a special transducing coating induces a length variation of the optical fiber as a function of the surrounding humidity levels. An advantage of this setup is that the sensor can not only be read by the same reading unit but can also easily be multiplexed with other sensor types to form a multi functional sensor network. This is of a particular interest for monitoring materials such as reinforced concrete, where structural health assessment criteria include deformation, depassivation and humidity. Several sensor configurations have been tested using dry-wet cycles at room temperature. Through this testing a prototype humidity sensor has been developed which responds consistently to humidity. Using pH sensitive coatings, the same design could be used for a fiber optic pH sensor.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Pascal Kronenberg, Pascal Kronenberg, Brian Culshaw, Brian Culshaw, S. Gareth Pierce, S. Gareth Pierce, } "Development of a novel fiber optic sensor for humidity monitoring", Proc. SPIE 3670, Smart Structures and Materials 1999: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (31 May 1999); doi: 10.1117/12.349762; https://doi.org/10.1117/12.349762

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