Plastic Optical Fiber Displacement Sensor for Cracks Monitoring

Massimo Olivero; Guido Perrone; Alberto Vallan; Silvio Abrate

doi:10.4028/www.scientific.net/KEM.347.487

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 347Plastic Optical Fiber Displacement Sensor for...

Plastic Optical Fiber Displacement Sensor for Cracks Monitoring

Abstract:

In the following we present a low-cost optical system for cracks evolution monitoring. The transducer principle is based on the variation of light transmitted between two facing fibers with their axial distance, exploiting the unique light-collecting capabilities of large-core polymer optical fibers. The characterization shows that the working range of the transducer is up to 3.5cm, with a resolution of 10$m and a repeatability of 5$m. With our current custom-developed control unit, up to four transducers can be arranged to provide a multi-axial displacement sensor or to simultaneously monitor four points for distributed sensing. A closed-loop light modulation/detection scheme is implemented to reduce the environmental noise sensitivity. The control unit is interfaced to a PC via USB port or via GSM/GPRS modem to automatically send periodical reports of the measurements and to issue warnings in case of displacements above a given threshold. Extensive tests in an environmental chamber have been carried out in order to extract calibration curves and to compensate for day-night and summer-winter temperature fluctuations.

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Periodical:

Key Engineering Materials (Volume 347)

Pages:

487-492

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.347.487

Citation:

Cite this paper

Online since:

September 2007

Authors:

Massimo Olivero, Guido Perrone, Alberto Vallan, Silvio Abrate

Keywords:

Building Health Monitoring, Displacement Measurement, Fiber Optic Sensor, Optical Fiber Transducers, Plastic Optical Fibres, Structural Engineering

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