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

Iskn

Advanced Magnetic Interaction, Ami

Rabeb Aloui

Tristan Hautson

Timothée Jobert

Saifeddine Aloui

A method for locating at least one movable magnetic object relative to a network of at least N tri-axial magnetometers linked together mechanically with no degree of freedom to retain a known relative position of these magnetometers, N being an integer number at least equal to 2, comprises, continuously: a step of detection of a magnetometer capable of being magnetized, i.e. capable of delivering as output measurements comprising a measurement bias following a magnetization; a step of correction, by means of a correction bias, of the measurements delivered by the magnetometer capable of being magnetized, the correction bias corresponding to a deviation between the measurements supplied by the magnetometer as input for a location filtering and the estimations, upon the location filtering, of the data delivered by the magnetometer; and a step of consideration of the magnetometer as not capable of being magnetized, by taking into account the step of correction of the magnetometer capable of being magnetized.

Method for locating at least one movable magnetic object and associated system

A configurable human-machine interface for controlling an electrical apparatus includes at least one permanent magnet rigidly connected to each of utensils and a magnetometer array including N triaxial magnetometers, mechanically linked to each other without any degree of freedom to retain a known distance between each of the magnetometers, wherein N is a whole number greater than or equal to five, and a processing unit configured to: define, for each permanent magnet of a utensil, a value of at least one variable encoding a position or orientation of same in a three-dimensional reference system fixed without any degree of freedom to the array or the amplitude of the magnetic moment of same, from measurements of the magnetometers of the array, and automatically select a control law based on the value defined for the variable.

Configure human-machine interface including a utensil and an array of magnetometers

A method for recognizing a magnetic object includes holding the object immobile in front of an array of N (where N is &#x3e;five) tri-axial magnetometers (M) linked with no degree of freedom. There is a fixed distance between two consecutive magnetometers less than the maximum separation between the magnetic parts of the magnetic object furthest away from one another. The method includes measuring by each magnetometer a vector bof which each coordinate represents the value of the magnetic field projected onto a respective measurement axis of the magnetometer, and a union of vectors bforming a measured magnetic signature S, where the index 'i' is an identifier of the magnetometer. The method includes computing of a deviation E between the magnetic signature Sand a prerecorded magnetic signature Sof a known magnetic object. The method includes comparing E to a predetermined threshold and recognizing the magnetic object.

Method for automatically recognising a magnetic object

A method is provided for continuously detecting a state of contact or non-contact between a tip of an instrument and a writing surface of a writing medium of variable thickness positioned on a bearing surface of a tracking device.

Method for continuously detecting a state of contact or non-contact between a tip of an instrument and a writing medium having a variable thickness, and related system

A method for locating at least one movable magnetic object with respect to an array of at least N triaxial magnetometers comprises steps consisting in: subtracting a weighted average from each of the measurements to obtain modified measurement; loading the modified measurements and a location of the one or more movable magnetic objects at the current time as input into a filtering operation for locating the one or more movable magnetic objects; implementing the location filtering operation, this comprises steps consisting in: subtracting a weighted average from each of the estimated data; and delivering as output a location of the one or more movable magnetic objects at a subsequent time.

An automatic recognition method includes the calculation of an error representative of the difference between an estimate of the values of the magnetometer measurements when the positions, orientations and amplitudes of the magnetic moments of the P dipoles are equal to those determined, and the values of the magnetometer measurements taken. There is the selection of another system of equations linking each measurement of a triaxial magnetometer to the position, orientation and amplitude of the magnetic moment of P' magnetic dipoles. The method includes the calculation of at least one distinctive feature of the object presented from the position, orientation, or amplitude of the magnetic moment of each dipole determined with the system of equations that minimizes the error calculated. The method includes the recognition of the magnetic object presented if the calculated distinctive features correspond to those of a known object, otherwise the lack of recognition of this object.

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Fontaine, France

Rabeb Aloui