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20 April 2000 Fiber optic microinterferometer vibration sensor system for monitoring of traffic and traffic-induced vibrations of bridges
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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.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Norbert Fuerstenau and Markus Schmidt "Fiber optic microinterferometer vibration sensor system for monitoring of traffic and traffic-induced vibrations of bridges", Proc. SPIE 3988, Smart Structures and Materials 2000: Smart Systems for Bridges, Structures, and Highways, (20 April 2000); https://doi.org/10.1117/12.383139
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