Geophone with a sensitive element made of piezoelectric polymer
AssigneeThomson-CSF
InventorsClaude Gragnolati, Didier Thollon, Jean-Georges Malcor
Life of this patent
Estimating the term…
Abstract
A geophone designed to measure the vibrations of bodies, especially vibrations in the earth's crust, comprises two-strip sensors made of piezoelectric polymer, embedded by one end in the geophone casing and resting freely, by one side, on the inertial mass of the geophone, thus enabling the making of geophones with a very wide pass-band.
Claims6
A geophone having a measuring plane, which comprises a casing having an internal face, a cylindrical inertials mass having an axis perpendicular to said measuring plane, two end surfaces and a lateral surface, two members made with a viscoelastic material presenting a modulus of transverse elasticity and being fixed to said internal face and to respectively said end surfaces for maintaining said inertial mass along said axis within said casing, and at least three two-strip sensors made of flexible piezoelectric polymer having a low natural resonance frequency, said sensors having two ends, being evenly distributed around said lateral surface resting freeing on said lateral surface and being embedded in said internal face by a single one of said ends, and wherein said members are twin-wheel shaped.
Dependencies are inferred from the claim text.