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Proceedings Paper

Optical setup development for the monitoring of structural dynamic behavior using SOFO sensors
Author(s): Sandra LLoret; Daniele Inaudi; Branko Glisic; Pascal Kronenberg; Samuel Vurpillot
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Paper Abstract

Fiber optic sensors have already demonstrated to be suitable for the monitoring of full-scale structures. Usually, most effort has been concentrated in improving the different sensing techniques and it remains often the problem of adapting the sensor to the harsh and dusty environment of the building site. In this context, the SOFO deformation sensors have successfully been tested in different types of structures. The current measurement system, based on low- coherence interferometry, is specially conceived for the long- term assessment of structures, where high precision, resolution and stability is required. Since each measurement takes a few seconds, the set-up is not adequate to monitor the dynamic behavior of structures, where measurement frequencies of up to 1 KHz are necessary. In order to take advantage of the good performance of the current SOFO sensors, a new technique to demodulate at a high frequency the signal from these sensors has been investigated. Based in the radio- frequency amplitude modulation of a low-coherence source, this intensity-based method offers the required dynamic range of several mm to measure the deformations of the structure under dynamic loads. In this paper we present the theoretical background together with the experimental verification of the principle.

Paper Details

Date Published: 12 June 2000
PDF: 7 pages
Proc. SPIE 3986, Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (12 June 2000); doi: 10.1117/12.388107
Show Author Affiliations
Sandra LLoret, Swiss Federal Institute of Technology/Lausanne (Switzerland)
Daniele Inaudi, Swiss Federal Institute of Technology/Lausanne and SMARTEC SA (Switzerland)
Branko Glisic, Swiss Federal Institute of Technology/Lausanne (Switzerland)
Pascal Kronenberg, Swiss Federal Institute of Technology/Lausanne (Switzerland)
Samuel Vurpillot, Swiss Federal Institute of Technology/Lausanne and SMARTEC SA (Switzerland)


Published in SPIE Proceedings Vol. 3986:
Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials
Richard O. Claus; William B. Spillman, Editor(s)

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