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Proceedings Paper

Mechanical monolithic sensor for low frequency seismic noise measurement
Author(s): Fausto Acernese; Rosario De Rosa; Gerardo Giordano; Rocco Romano; Fabrizio Barone
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Paper Abstract

This paper describes a mechanical monolithic sensor for geophysical applications developed at the University of Salerno. The instrument is basically a monolithic tunable folded pendulum, shaped with precision machining and electric-discharge-machining, that can be used both as seismometer and, in a force-feedback configuration, as accelerometer. The monolithic mechanical design and the introduction of laser interferometric techniques for the readout implementation make it a very compact instrument, very sensitive in the low-frequency seismic noise band, with a very good immunity to environmental noises. Many changes have been produced since last version (2006), mainly aimed to the improvement of the mechanics and of the optical readout of the instrument. In fact, we have developed and tested a prototype with elliptical hinges and mechanical tuning of the resonance frequency together with a new laser optical lever and laser interferometer readout system. The theoretical sensitivity curve for both laser optical lever and laser interferometric readouts, calculated on the basis of suitable theoretical models, shows a very good agreement with the experimental measurements. Very interesting scientific result is that the measured natural resonance frequency of the instrument is ≈ 70mHz with a Q ≈ 140 in air without thermal stabilization, demonstrating the feasibility of a monolithic FP sensor with a natural resonance frequency of the order of 5 mHz with a more refined mechanical tuning.

Paper Details

Date Published: 12 November 2007
PDF: 12 pages
Proc. SPIE 6749, Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VII, 67491I (12 November 2007); doi: 10.1117/12.737469
Show Author Affiliations
Fausto Acernese, Univ. degli Studi di Salerno (Italy)
Rosario De Rosa, Univ. degli Studi di Napoli Federico II (Italy)
Gerardo Giordano, Univ. degli Studi di Napoli Federico II (Italy)
Rocco Romano, Univ. degli Studi di Salerno (Italy)
Fabrizio Barone, Univ. degli Studi di Salerno (Italy)


Published in SPIE Proceedings Vol. 6749:
Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VII
Manfred Ehlers; Ulrich Michel, Editor(s)

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