Device and method for health monitoring of an area of a structural element, and structure adapted for health monitoring of an area of a structural element of said structure
AssigneesCentre National de la Recherche Scientifique (CNRS), Office National d'Etudes et de Recherches Aerospatiales (O.N.E.R.A.), Ecole Normale Superieure De Cachan
InventorsMichel Bernard Lemistre, Dominique Marc Placko
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Abstract
Device for health monitoring of a structure comprising a dielectric material of permittivity εr, comprising a source of electromagnetic radiation, generating an electric field in the structure a detector measuring a component of the electric field, calculation means giving the value of εr on the basis of the said component.
Claims27
Device for health monitoring of an area of a structural element comprising at least one dielectric material of dielectric permittivity εr comprising:
- (A) means of emission of electromagnetic radiation extending in a direction, the electromagnetic field generating an electric field in the area,
- (B) detection means suitable for measuring a first measured component of an electric field, along a first direction of detection, and
- (C) calculation means suitable for obtaining a value of the dielectric permittivity εr in the area on the basis of the first measured component, in which the structural element is an inhomogeneous structural element comprising an imperfectly conducting material, of electrical conductivity σ, in which the means of emission is means of emission of magnetic radiation that is suitable for generating a magnetic field, the magnetic field being, at the area, equivalent to a magnetic field emitted by a magnetic dipole extending in the direction, and in which the calculation means is furthermore suitable for obtaining a value of the electrical conductivity σ in the area on the basis of the first measured component.
Structure suitable for health monitoring of an area of a structural element of the structure, and comprising:
- at least one dielectric material of dielectric permittivity εr,
- an electromagnetic radiation emission layer extending in a direction, the electromagnetic field generating an electric field in the area,
- a detection layer suitable for measuring a first measured component of an electric field, along a first direction of detection, and
- at least one facility for connection to a calculation means suitable for obtaining a value of the dielectric permittivity εr in the area on the basis of the first measured component, in which the structural element is an inhomogeneous structural element comprising an imperfectly conducting material, of electrical conductivity σ, in which the means of emission comprises means of emission of magnetic radiation that is suitable for generating a magnetic field, the magnetic field being, at the area, equivalent to a magnetic field emitted by a magnetic dipole extending in the direction, and in which the calculation means is alternatively suitable for obtaining a value of the electrical conductivity σ in the area on the basis of the first measured component.
Method for health monitoring of an area of a structural element comprising at least one dielectric material of dielectric permittivity εr, the method comprising:
- (a) generating an electromagnetic field by means of emission of electromagnetic radiation extending in a direction, the electromagnetic field generating an electric field in the area,
- (b) generating a magnetic field by means of emission of magnetic radiation while generating the electromagnetic field, the magnetic field being, at the area, equivalent to a magnetic field emitted by a magnetic dipole extending in the direction;
- (c) measuring a first measured component of an electric field along a first direction of detection by means of detection means, and
- (d) obtaining at least one of a value of the dielectric permittivity εr in the area or a value of the electrical conductivity σ in the area on the basis of the first measured component by means of calculation means, in which the structural element is an inhomogeneous structural element comprising an imperfectly conducting material, of electrical conductivity σ.
Dependencies are inferred from the claim text.