Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Institut Polytechnique De Grenoble

Jean-Baptiste Albertini

Arnaud Walther

Robert Cuchet

Jerome Delamare

Jérôme Delamare

Aline Msaed

A gradient sensor of a component of a magnetic field comprising at least one elementary sensor comprising a deformable mass () equipped with a permanent magnet () having a magnetization direction substantially colinear to the direction of the gradient of the component of the magnetic field to be acquired by the sensor. The deformable mass () is able to deform under the effect of a force exerted on the magnet by the gradient, the effect of this force being to shift it, by dragging the deformable mass (), in a direction substantially colinear to the component of the magnetic field for which the sensor has to acquire the gradient. The deformable mass () is anchored to a fixed support device () in at least two anchoring points () substantially opposite relative to the mass (). The elementary sensor also comprises measuring means () of at least one electric variable translating deformation or stress of the deformable mass () engendered by the gradient.

Gradient sensor of a component of a magnetic field with permanent magnet

A process for measuring the gradient or an n-th order derivative, in which n is greater than 1, in a direction z, of a component Hx of a magnetic field, the component being invariant, at least locally, in a direction y. The method includes: a) positioning of N (N&#x3e;n+1) elementary field sensors, each sensor being offset, relative to the neighboring sensors, along y by a distance Ty and along the z axis by a distance &#x394;z, b) measurement of the field by each of the N sensors, and c) calculation of the desired gradient, or the desired nth-order derivative, as a function of the measurements of the field obtained during b).

Structure of a magnetic-field gradient sensor and process for fabricating it in integrated technology

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Ajaccio, France

Jean-Baptiste Albertini