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Proceedings Paper

New architecture of tunable mechanical monolithic horizontal sensor for low frequency seismic noise measurement
Author(s): Fausto Acernese; Gerardo Giordano; Rosario De Rosa; Rocco Romano; Silvia Vilasi; Fabrizio Barone
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Paper Abstract

This paper describes a new mechanical architecture of the monolithic tunable folded pendulum, developed at the University of Salerno, configurable both as seismometer and, in a force-feedback configuration, as accelerometer. Typical applications are the remote monitoring of seismic and newtonian noises for geophysical applications. This sensor, shaped with precision machining and electric-discharge-machining, like the previous versions, is a very compact instrument, very sensitive in the low-frequency seismic noise band, with a very good immunity to environmental noises. Important characteristics are the large band (10-6 - 10mHz), the tunability of the resonance frequency and the laser optical readout, that integrates an optical lever and a laser interferometer. The theoretical sensitivity curves, largely improved due to a new design of the pendulum arms and of the electronics, are in a very good agreement with the measurements. In particular, a very good sensitivity (10-12 m/Hz1/2) has been obtained in the band 0.1 - 10 Hz). Prototypes of monolithic seismometers are already operational in selected sites around the world both to remotely acquire data for scientific analysis of seismic noise and to collect all the useful information to understand their performances in the very low frequency band. The results of the monolithic sensor as accelerometer (force feed-back configuration) are also presented and discussed.

Paper Details

Date Published: 23 October 2010
PDF: 12 pages
Proc. SPIE 7831, Earth Resources and Environmental Remote Sensing/GIS Applications, 78310E (23 October 2010); doi: 10.1117/12.865063
Show Author Affiliations
Fausto Acernese, Univ. degli Studi di Salerno (Italy)
INFN (Italy)
Gerardo Giordano, Univ. degli Studi di Salerno (Italy)
Rosario De Rosa, INFN (Italy)
Univ. degli Studi di Napoli Federico II (Italy)
Rocco Romano, Univ. degli Studi di Salerno (Italy)
INFN (Italy)
Silvia Vilasi, Univ. degli Studi di Salerno (Italy)
INFN (Italy)
Fabrizio Barone, Univ. degli Studi di Salerno (Italy)
INFN (Italy)


Published in SPIE Proceedings Vol. 7831:
Earth Resources and Environmental Remote Sensing/GIS Applications
Ulrich Michel; Daniel L. Civco, Editor(s)

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