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AssigneeCommissariat A L'energie Atomique Et Aux Energies Alternatives
InventorsTristan Hautson, Rabeb Aloui, Saifeddine Aloui, Timothée Jobert
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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.
A non-abstract method comprising implementing an improvement in technology, wherein said technology is the technology of magnetometers, wherein said improvement comprises a method of using an array of magnetometers to recognize a relationship between a first object and a second object, said first and second objects each being secured to a corresponding one of a plurality of parts—wherein each of said parts is capable of distorting the field lines of the Earth's magnetic field, wherein said plurality of parts comprises a first part and a second part, wherein said array comprises at least five tri-axial magnetometers, wherein said at least five tri-axial magnetometers comprise consecutive tri-axial magnetometers that are separated by a fixed distance, wherein implementing said improvement comprises executing a process that includes holding said first object at a predetermined position against said array and computing a deviation between a measurement and a reference, wherein said measurement is a measurement of at least fifteen norms along said array of magnetometers, wherein said norms are measured while said first object is thus held against said array, wherein said reference is a reference based on at least fifteen corresponding norms that would have been obtained by said array had said second object been held against said array at said predetermined position, wherein each of said norms is a norm of a projection of a magnetic field along an axis of one of said tri-axial magnetometers, wherein said process further comprises determining a relationship between said deviation and a predetermined threshold, and based on said relationship, selecting an action from the group consisting of recognizing that said first object corresponds to said second object and recognizing that said first object does not correspond to said second object, wherein said plurality of parts comprises a third part that is fixed to said first object, wherein a separation between said first and third parts is a maximum separation between any two parts on said first object, wherein said maximum separation is twice said fixed distance between said magnetometers.
A non-abstract apparatus for implementing an improvement in the technology of recognizing a relationship between first and second objects, said first and second objects each being secured to a corresponding one of a plurality of parts, wherein each of said parts is capable of distorting the field lines of the Earth's magnetic field, wherein said plurality of parts comprises a first part, a second part, and a third part, wherein said third part is fixed to said first object, said apparatus comprising an array of non-abstract magnetometers, said array comprising at least five tri-axial non-abstract magnetometers that are linked mechanically to one another with no degree of freedom to maintain a fixed distance between each of the magnetometers, wherein a separation between said first and third parts is a maximum separation between any two parts on said first object, wherein said maximum separation is twice said fixed distance between each of the magnetometers, and a processing unit programmed to compute a deviation between a measurement and a reference when said first object is held at a predetermined first position against said array, wherein said measurement is a measurement of at least fifteen norms along said array of magnetometers, wherein said norms are measured while said first object is thus held against said array, wherein said reference is a reference based on at least fifteen corresponding norms that would have been obtained by said array had said second object been held against said array at said predetermined position, wherein each of said norms is a norm of a projection of a magnetic field along an axis of one of said tri-axial magnetometers, wherein said processor is further configured to determine a relationship between said deviation and a predetermined threshold, and based on said relationship, to select an action from the group consisting of recognizing that said first object corresponds to said second object and recognizing that said first object does not correspond to said second object.
A manufacture comprising a tangible and non-transitory information storage medium comprising instructions for causing an electronic computer to compute a deviation, wherein said electronic computer is a constituent of an apparatus for recognizing a relationship between first and second objects, said first and second objects each being secured to a corresponding one of a plurality of parts, wherein each of said parts is capable of distorting the field lines of the Earth's magnetic field, wherein said plurality of parts comprises a first part, a second part, and a third part, wherein said third part is fixed to said first object, wherein said apparatus comprises, in addition to said electronic computer, an array of non-abstract magnetometers, said array comprising at least five tri-axial non-abstract magnetometers that are linked mechanically to one another with no degree of freedom to maintain a fixed distance between each of the magnetometers, wherein a separation between said first and third parts is a maximum separation between any two parts on said first object, wherein said maximum separation is twice said fixed distance between each of the magnetometers, and wherein said instructions, when executed by said electronic computer, cause said electronic computer to compute said deviation between a measurement and a reference when said first object is held at a predetermined first position against said array, wherein said measurement is a measurement of at least fifteen norms along said array of magnetometers, wherein said norms are measured while said first object is thus held against said array, wherein said reference is a reference based on at least fifteen corresponding norms that would have been obtained by said array had said second object been held against said array at said predetermined position, wherein each of said norms is a norm of a projection of a magnetic field along an axis of one of said tri-axial magnetometers, wherein said instructions further comprise instructions for causing said electronic computer to determine a relationship between said deviation and a predetermined threshold and based on said relationship, to select an action from the group consisting of recognizing that said first object corresponds to said second object and recognizing that said first object does not correspond to said second object.
Dependencies are inferred from the claim text.