New architecture of tunable mechanical monolithic horizontal sensor for low frequency seismic noise measurement

Fausto Acernese; Gerardo Giordano; Rosario De Rosa; Rocco Romano; Silvia Vilasi; Fabrizio Barone

doi:10.1117/12.865063

23 October 2010 New architecture of tunable mechanical monolithic horizontal sensor for low frequency seismic noise measurement

Fausto Acernese, Gerardo Giordano, Rosario De Rosa, Rocco Romano, Silvia Vilasi, Fabrizio Barone

Author Affiliations +

Proceedings Volume 7831, Earth Resources and Environmental Remote Sensing/GIS Applications; 78310E (2010) https://doi.org/10.1117/12.865063
Event: SPIE Remote Sensing, 2010, Toulouse, France

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/Hz^1/2) 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.

Citation Download Citation

Fausto Acernese, Gerardo Giordano, Rosario De Rosa, Rocco Romano, Silvia Vilasi, and Fabrizio Barone "New architecture of tunable mechanical monolithic horizontal sensor for low frequency seismic noise measurement", Proc. SPIE 7831, Earth Resources and Environmental Remote Sensing/GIS Applications, 78310E (23 October 2010); https://doi.org/10.1117/12.865063

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