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Proceedings Paper

Fiber optic microinterferometer vibration sensor system for monitoring of traffic and traffic-induced vibrations of bridges
Author(s): Norbert Fuerstenau; Markus Schmidt
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Paper Abstract

An electromagnetic immune fiber-optic Extrinsic Fabry-Perot microinterferometer vibration sensor system (EFPI-V) with cantilever type sensing elements is described. Several sensors with low resonance frequency (first bending mode f1 < 100 Hz) are installed along the edge of a taxiway of Braunschweig airport with separation distances between 15 and 60 m for investigation of ground traffic monitoring via vibrational and noise induced broadband excitation of the resonances. Modified sensors with f1 >= 100 Hz are developed for quantitative low frequency (f < 100 Hz) acceleration measurements. Initial characterization of a 100 Hz-sensor, using a capacitive accelerometer as a reference exhibits the expected f2-dependence of the amplitude for f < 50 Hz and acceleration amplitudes down to some mg. For the first time to our knowledge field tests with an EFPI- acceleration sensor have been performed for monitoring the traffic induced vibrations of a motorway bridge (EC-project 'Smart Structures'). The measured frequency spectra show reasonable agreement with the response of the capacitive accelerometer for f < 50 Hz.

Paper Details

Date Published: 20 April 2000
PDF: 11 pages
Proc. SPIE 3988, Smart Structures and Materials 2000: Smart Systems for Bridges, Structures, and Highways, (20 April 2000); doi: 10.1117/12.383139
Show Author Affiliations
Norbert Fuerstenau, DLR (Germany)
Markus Schmidt, DLR (Germany)


Published in SPIE Proceedings Vol. 3988:
Smart Structures and Materials 2000: Smart Systems for Bridges, Structures, and Highways
S.-C. Liu, Editor(s)

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