Abstract: 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.

Abstract: The method relates to a synchronization of a magnetic locating system including a first device and a second device each including an oscillator, a time counter clocked by the oscillator, and a radiocommunication module. The locating system also includes a device for emitting and receiving alternating magnetic fields, the device being configured to allow a propagation of alternating magnetic fields between the first and second devices, the device for emitting and receiving alternating magnetic fields being connected to the oscillators of the first and second devices. The synchronizing method includes a synchronizing step that is configured to synchronize the oscillators of the first and second devices by adjusting, by servo-controlling the oscillator of the second device, the operation of the time counter of the second device to the operation of the time counter of the first device.

Abstract: Matrix pressure sensor with neural network, and calibration method Matrix pressure sensor (1), comprising: a matrix (2) of tactile pixels (10) at least some of which have a reciprocal crosstalk effect between them, a neural network (30) for processing an image (IP_MES) of the response from the sensor and providing a corrected image (IP_COR), this network having been trained from an augmented database (BDAUG) comprising: real homogeneous pressing data measured by applying a homogeneous pressure (PR) to at least some of the pixels, better still to all of the pixels of the matrix, and additional partial pressing data produced through simulation by applying binary masks (MAS) to the real homogeneous pressing data, so as to simulate partial pressing without a crosstalk effect with the pixels situated outside partial pressing areas.

Abstract: 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.

Abstract: A method for estimating an angular deviation between a reference axis of a magnetic object and a magnetic axis co-linear to a magnetic moment of the magnetic object, including: a) positioning the magnetic object facing at least one magnetometer; b) rotating the magnetic object about the reference axis; c) measuring, during the rotating, the magnetic field, using the magnetomenter; and d) estimating the angular deviation from the magnetic field measurements.

Abstract: A force sensor includes at least one cavity defining at least two surfaces having different orientations. On each of said surfaces is disposed at least one respective detection structure sensitive to a pressure exerted on the corresponding surface. A resiliently deformable medium at least partially fills the cavity by coming into contact with the surfaces and defines a detection surface, on which a force to be detected is likely to be exerted. The application of this force is likely to generate stresses on each detection structure due to the transmission of forces by the medium.

Abstract: A method of calibrating a network of magnetometers (C1, Ci) including the displacement of a magnet holder tool (10) above the network, and solving an optimisation problem to determine a localisation of the magnetometers in the network. This localisation minimises based on an optimisation criterion, the difference between a real attribute (D, m1, m2) of the magnet holder tool and an estimate of the attribute determined without knowledge of the displacement, starting from the localisation and measurements made by the magnetometers in the network during the displacement.

Abstract: A method for detecting an anomaly, associated with a magnetic locating device including a first magnetic element and a second magnetic element that are associated with a first object and with a second object, respectively. The first object includes a first movement sensor configured to determine a first datum dependent on inclination of the first object in a basic reference frame, or the terrestrial reference frame. The method includes: determining the first datum from the first movement sensor; determining a second datum dependent on inclination of the second object in the basic reference frame; determining at least one orientation parameter with the magnetic locating device using the first and second magnetic elements; using the at least one orientation parameter and the first and second data to generate an indicator of presence of the anomaly.

Abstract: A method of calibrating a network of magnetometers (C1, Ci) including the displacement of a magnet holder tool (10) above the network, and solving an optimisation problem to determine a localisation of the magnetometers in the network. This localisation minimises based on an optimisation criterion, the difference between a real attribute (D, m1, m2) of the magnet holder tool and an estimate of the attribute determined without knowledge of the displacement, starting from the localisation and measurements made by the magnetometers in the network during the displacement.

Abstract: A method for estimating an angular deviation between a reference axis of a magnetic object and a magnetic axis co-linear to a magnetic moment of the magnetic object, including: a) positioning the magnetic object facing at least one magnetometer; b) rotating the magnetic object about the reference axis; c) measuring, during the rotating, the magnetic field, using the magnetomenter; and d) estimating the angular deviation from the magnetic field measurements.

Abstract: A method for recognizing a magnetic object includes holding the object immobile in front of an array of N (where N is >five) tri-axial magnetometers (Mij) 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 bi,m of which each coordinate represents the value of the magnetic field projected onto a respective measurement axis of the magnetometer, and a union of vectors bi,m forming a measured magnetic signature Sm, where the index “i” is an identifier of the magnetometer. The method includes computing of a deviation E between the magnetic signature Sm and a prerecorded magnetic signature SRef of a known magnetic object. The method includes comparing E to a predetermined threshold and recognizing the magnetic object.

Abstract: The method relates to a synchronization of a magnetic locating system including a first device and a second device each including an oscillator, a time counter clocked by the oscillator, and a radiocommunication module. The locating system also includes a device for emitting and receiving alternating magnetic fields, the device being configured to allow a propagation of alternating magnetic fields between the first and second devices, the device for emitting and receiving alternating magnetic fields being connected to the oscillators of the first and second devices. The synchronizing method includes a synchronizing step that is configured to synchronize the oscillators of the first and second devices by adjusting, by servo-controlling the oscillator of the second device, the operation of the time counter of the second device to the operation of the time counter of the first device.

Abstract: A method for detecting an anomaly, associated with a magnetic locating device including a first magnetic element and a second magnetic element that are associated with a first object and with a second object, respectively. The first object includes a first movement sensor configured to determine a first datum dependent on inclination of the first object in a basic reference frame, or the terrestrial reference frame. The method includes: determining the first datum from the first movement sensor; determining a second datum dependent on inclination of the second object in the basic reference frame; determining at least one orientation parameter with the magnetic locating device using the first and second magnetic elements; using the at least one orientation parameter and the first and second data to generate an indicator of presence of the anomaly.

Abstract: A method allowing the determination of the location and/or the orientation of a magnetic field source in space, and more particularly a method for determining the relative position in space of at least one magnetic field source in relation to at least one magnetic field sensor comprises the steps of acquiring measurements of the magnetic field, computing a solution of the expression of the magnetic field generated by at least one magnetic field source by modeling each magnetic field source by an element chosen from among a superposition of solenoids and a superposition of charged planes, then by estimating the value of a complete elliptic integral linked to the model by an algorithm using a Landen transformation and computing at least one element chosen from among the position and the orientation of each magnetic field source.

Abstract: The invention relates to a method of localisation of vector magnetometers arranged in a network, comprising the following steps: generation (EMi), by a magnetic field source (S), of m reference magnetic fields with known amplitudes and known and distinct directions; measurement (MESj) of the m reference magnetic fields along n axes of magnetometers in the network, m and n being such that m*n?6; determination (LOCj) of the position and orientation of magnetometers of the network from said measurements, relative to the magnetic field source. The invention also includes a magnetic field measurement instrument that includes a network of vector magnetometers and is capable of implementing the localisation method. Application to the imagery of biomagnetic fields, for example in magnetocardiography or in magnetoencephalography.

Abstract: Locating a moving magnetic object includes determining its position or orientation from measurements from an array N tri-axial magnetometers (N>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<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.

Abstract: 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.

Abstract: A method of detecting a point of contact between a tip of an instrument and a writing support, the instrument being one of a pen and an eraser, and the method comprising determining, with the aid of a magnetic object fixed without any degree of freedom on the instrument, the height of a point of the instrument with respect to a bearing face of a tablet. The bearing face constituting the writing support or supporting the writing support. The method further includes: comparing the height determined with a preconfigured contact threshold, and detecting a point of contact between the tip of the instrument and the writing support if the height determined is less than the contact threshold and, in the converse case, detecting no point of contact between the tip of the instrument and the writing support.

Abstract: A method for recognizing a magnetic object includes holding the object immobile in front of an array of N (where N is >five) tri-axial magnetometers (Mij) 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 bi,m of which each coordinate represents the value of the magnetic field projected onto a respective measurement axis of the magnetometer, and a union of vectors bi,m forming a measured magnetic signature Sm, where the index “i” is an identifier of the magnetometer. The method includes computing of a deviation E between the magnetic signature Sm and a prerecorded magnetic signature SRef of a known magnetic object. The method includes comparing E to a predetermined threshold and recognizing the magnetic object.

Abstract: 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.