Giordano, Gerardo (2008) Development and test of tunable mechanical monolithic horizontal accelerometer for low frequency seismic noise measurement. [Tesi di dottorato] (Unpublished)

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Item Type: Tesi di dottorato
Language: English
Title: Development and test of tunable mechanical monolithic horizontal accelerometer for low frequency seismic noise measurement
Creators:
CreatorsEmail
Giordano, Gerardogerardo.giordano@na.infn.it
Date: 30 November 2008
Institution: Università degli Studi di Napoli Federico II
Department: Scienze fisiche
Doctoral School: Rischio sismico
PHD name: Rischio sismico
PHD cycle: 21
PHD Coordinator:
nameemail
Gasparini, Paolopaolo.gasparini@na.infn.it
Tutor:
nameemail
Barone, Fabriziofabrizio.barone@na.infn.it
Milano, Leopoldoleopolo.milano@na.infn.it
Date: 30 November 2008
Uncontrolled Keywords: Seismometer , Accelerometer , low frequency , Folded Pendulum , Optical Lever , Michelson Interferometer , Control
MIUR S.S.D.: Area 02 - Scienze fisiche > FIS/07 - Fisica applicata (a beni culturali, ambientali, biologia e medicina)
Area 02 - Scienze fisiche > FIS/06 - Fisica per il sistema terra e il mezzo circumterrestre
Date Deposited: 16 Nov 2009 09:16
Last Modified: 30 Apr 2014 19:36
URI: http://www.fedoa.unina.it/id/eprint/3365

Abstract

This thesis describes a mechanical horizontal monolithic sensor for geophysical applications. 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. It is a very compact instrument, very sensitive in the low-frequency seismic noise band, with a very good immunity to environmental noises, whose main characteristics are the tunability of the resonance frequency and the integrated laser optical readout, consisting of an optical lever and an interferometer. The theoretical sensitivity curves are in a very good agreement with the measurements. A direct comparison of its performances with the STS-2 ones shows that better performances have been reached with the interferometric readout, about 10e-12 m/sqrt(Hz) in the band [0.01,10] Hz as seismometer. The first results as accelerometer (force feed-back configuration) are also presented and discussed.

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