Commissariat À L'énergie Atomique Et Aux Énergies Alternatives

Advanced Magnetic Interaction, Ami

Commissariat a L'energie Atomique Et Aux Energies Alternatives

Iskn

Tristan Hautson

Dominique David

Timothée Jobert

Rabeb Aloui

Saifeddine Aloui

David Dominique

Franck Vial

Sébastien Brulais

Jean-Luc Vallejo

Jean-Marie Dupre La Tour

Andréa Vassilev

Simon Thomas

Laure Peris Y Saborit

Vincent Thomas Pellerano

Sophie Bonneau

Clement Rosset

Jean-Pierre Traveaux

Jean-Marie Dupré La Tour

Ons Manchoul

Romain Chesney

Myrna Jaillet-Casillas

Sébastien Riou

Guilhem Sauvagnac

A method for controlling a graphic interface involving images of a digital representation of a launcher, where the launcher including a launching arm equipped with a magnet. An array of magnetometers Mmeasures the magnetic field generated by the magnet, a state vector of the launching arm in a virtual reference frame Rv is determined, and a phase of arming then firing a projectile in the virtual reference frame Rv are identified. An image is then constructed and displayed on the graphic interface.

Method for controlling a graphic interface for displaying the launching of a projectile in a virtual environment

An electronic interactive device includes an interaction surface for use with a user borne device. The interaction surface includes a contact detection surface for detecting a device contact event with the interaction surface; a plurality of magnetometers defining a reference coordinate system and a sensing volume proximate to the interaction surface, with each of the magnetometers having a rigid spatial relationship to the other magnetometers; and processing circuitry communicably coupled to at least the contact detection surface and the plurality of magnetometers. The plurality of magnetometers perform magnetic field measurements and provide measurement data to the processing circuitry. The processing circuitry determines at least one of position and/or magnet orientation relative to a longitudinal axis of the user borne device and a distance separating the magnet and/or magnet orientation relative to a longitudinal axis of the user borne device from the interaction surface when the contact event occurs.

Electronic device comprising magnetometers

The invention relates to a method for tracking an end of a utensil equipped with a magnetic object, wherein a parameter K(tn) representative of a contact between the end and a reference surface of a touch sensor is determined, and when contact is detected: an actual value D(k+1) of the distance Dbetween the end and the magnetic object is determined, on the basis of a value DI(k+1) of a distance, referred to as the projected distance DI between the position PA(tn) of the magnetic object and a position PI(tn) of a point of intersection between the reference surface and a straight line collinear with the magnetic moment m(tn), then the recorded value of the distance Dis updated on the basis of the actual determined value D(k+1) of the distance D

Method and device for tracking an end of a utensil comprising a recalibration of a distance between the end and a magnetic object securely fastened to the utensil

The invention relates to a system for recording a track comprising: a utensil comprising a tip and equipped with a magnetic object; a device for locating the magnetic object configured to determine an estimated reference position on a writing surface; and a matrix-array touch sensor configured to define a set of M pixels, among N pixels, at least partially encircling the estimated reference position, and to detect the contact of the tip on the writing surface on the basis of the electrical signals generated by said set of M pixels.

System for recording a track traced by a utensil over a writing surface

The present disclosure relates to a method for estimating the position of a magnet using a tracking device comprising an array of magnetometers, the method comprising phases of determining an initial state vector associated with the magnet, of measuring a useful magnetic field, of estimating a magnetic field, of calculating a bias between the measured magnetic field and the estimated magnetic field, and of updating the state vector on the basis of the bias. It also comprises an identifying phase comprising a step of identifying a magnetic disturbance on the basis of an indicator calculated depending on an estimated magnetic field and a measured magnetic field.

Method for estimating the position of a magnet comprising a phase for identifying a magnetic disturbance

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

The invention is a method for tracking a position of a magnet moving relative to a magnetometer array. On the basis of the magnetic field detected by each magnetometer of the array, the position of the magnet is estimated. This estimation is based on taking into account a reference magnetic field established beforehand, this reference magnetic field being subtracted from the magnetic field detected by each magnetometer, so as to form a differential measurement. The various successive estimations of the position of the magnet allow its path to be tracked.

Method of tracking a position of a magnet by differential measurement

A method for locating mobile objects by identifying, on the basis of the objects before a network of magnetometers, a supplementary equation. The method includes connecting, by means of a relationship of equality, a first variable from a current system of equations to a term, the term being a predefined relationship between one or more other variables from the current system of equations or a constant numerical value. The method also includes replacing, in the current system of equations, the first variable with the term to which it is equal to obtain a new system of equations in which the number of variables for which the value needs to be estimated is smaller than in the current system of equations. The method further includes using the new system of equations instead in order to estimate the position/orientation/amplitude of a magnetic moment of one of the magnetic objects.

Method for locating mobile magnetic objects presented before a network of magnetometers

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.

A method for locating utensils involves (step a) measuring, by magnetometers, of the amplitude of the magnetic field, and (step b) estimating, with the magnetometer measurements the positions, orientations and amplitudes of the magnetic moments of the objects of the utensils. The method also includes (step c) detecting each immobile utensil and, in response, adding the immobile utensil to a list, and (step d) establishing measurements from the magnetometers when they are exclusively in the presence of a reference magnetic field generated only by magnetic objects of all the immobile utensils in the list of immobile utensils. The method further includes (step e) calculating the amplitude of a disturbance on the basis of the differences between the measurements performed in step a) and the measurements established in step d). If the amplitude of the disturbance crosses a predetermined threshold, step b) is executed, otherwise the method returns to step a).

Method for locating mobile utensils presented before a network of magnetometers

A method for controlling a graphical interface includes: calculating coordinates of a permanent magnet and direction of magnetic moment of the permanent magnet from magnetometer measurements; matching dimensions of a three-dimensional object with the calculated coordinates by multiplying each dimension of the three-dimensional object by a coefficient to obtain a three-dimensional object brought to scale and by multiplying the calculated coordinates by inverse of a coefficient to obtain scaled coordinates; constructing a two-dimensional image corresponding to the image of the object brought to scale observed from a viewpoint and along an optical axis deduced from the scaled coordinates and from the direction of the magnetic moment of the permanent magnet; and controlling the graphical interface to display the constructed image on this graphical interface.

Method for controlling a graphical interface for displaying images of a three-dimensional object

Locating a moving magnetic object includes determining its position or orientation from measurements from an array N tri-axial magnetometers (N&#x3e;5) mechanically linked to one another with 0-DOF by repeatedly estimating its position relative to the array from measurements made either in a preceding iteration or from a sensor distinct from the array's magnetometers before making a new measurement using the array's magnetometers; computing the distance between each magnetometer and the object's estimated position; eliminating Ni magnetometers closest to this estimated position, where Ni&#x3c;N; using the remaining magnetometers, making a new measurement of the field generated or modified by the object; and determining its new position or orientation from the new measurements so as to obtain the object's new location.

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Fontaine, France

Tristan Hautson