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<title lang=en>A simple pendulum borehole tiltmeter based on a triaxial optical-fibre displacement sensor</title>
<creator>Chawah, P</creator>
<creator>Chéry, J</creator>
<creator>Boudin, F</creator>
<creator>Cattoen, Michel</creator>
<creator>Seat, Han Cheng</creator>
<creator>Plantier, Guy</creator>
<creator>Lizion, Françoise</creator>
<creator>Sourice, A</creator>
<creator>Bernard, Patrick</creator>
<creator>Brunet, C</creator>
<creator>Boyer, D</creator>
<creator>Gaffet, S</creator>
<contributor>Laboratoire d'acoustique de l'université du Mans (LAUM) ; Le Mans Université (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire d'analyse et d'architecture des systèmes [Toulouse] (LAAS) ; Institut National Polytechnique [Toulouse] (INP) - Institut National des Sciences Appliquées - Toulouse (INSA Toulouse) - Université Paul Sabatier - Toulouse 3 (UPS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Équipe Optoélectronique pour les Systèmes Embarqués (LAAS-OSE) ; Laboratoire d'analyse et d'architecture des systèmes [Toulouse] (LAAS) ; Institut National Polytechnique [Toulouse] (INP) - Institut National des Sciences Appliquées - Toulouse (INSA Toulouse) - Université Paul Sabatier - Toulouse 3 (UPS) - Centre National de la Recherche Scientifique (CNRS) - Institut National Polytechnique [Toulouse] (INP) - Institut National des Sciences Appliquées - Toulouse (INSA Toulouse) - Université Paul Sabatier - Toulouse 3 (UPS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institut de Physique du Globe de Paris (IPGP) ; Institut national des sciences de l'Univers (INSU - CNRS) - IPG PARIS - Université Paris Diderot - Paris 7 (UPD7) - Université de la Réunion (UR) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géoazur (GEOAZUR) ; Université Nice Sophia Antipolis (UNS) ; Université Côte d'Azur (UCA) - Université Côte d'Azur (UCA) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire de la Côte d'Azur - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0956-540X</source>
<source>EISSN: 1365-246X</source>
<source>Geophysical Journal International</source>
<publisher>Oxford University Press (OUP)</publisher>
<identifier>hal-01265967</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01265967</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01265967/document</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01265967/file/HCS1.pdf</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01265967</source>
<source>Geophysical Journal International, Oxford University Press (OUP), 2015, 203 (2), pp.1026-1038. 〈10.1093/gji/ggv358〉</source>
<identifier>DOI : 10.1093/gji/ggv358</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggv358</relation>
<language>en</language>
<subject lang=en>Transient deformation</subject>
<subject lang=en>Geomechanics</subject>
<subject lang=en>Tides and planetary waves</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Sensitive instruments like strainmeters and tiltmeters are necessary for measuring slowly varying low amplitude Earth deformations. Nonetheless, laser and fibre interferometers are particularly suitable for interrogating such instruments due to their extreme precision and accuracy. In this paper, a practical design of a simple pendulum borehole tiltmeter based on laser fibre interferometric displacement sensors is presented. A prototype instrument has been constructed using welded borosilicate with a pendulum length of 0.85 m resulting in a main resonance frequency of 0.6 Hz. By implementing three coplanar extrinsic fibre Fabry-Perot in-terferometric probes and appropriate signal filtering, our instrument provides tilt measurements that are insensitive to parasitic deformations caused by temperature and pressure variations. This prototype has been installed in an underground facility (Rustrel, France) where results show accurate measurements of Earth strains derived from Earth and ocean tides, local hydro-logic effects, as well as local and remote earthquakes. The large dynamic range and the high sensitivity of this tiltmeter render it an invaluable tool for numerous geophysical applications such as transient fault motion, volcanic strain and reservoir monitoring.</description>
<date>2015-11</date>
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