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

Minmaxmedical

Francois Bertrand

Matthieu Le Prado

Saifeddine Aloui

Sophie Morales

Stephane Lavallee

Umberto Rossini

Jean-Michel Leger

Elisabeth Delevoye

Mathieu Baicry

Mickael Chave

Vincent Josselin

Jaroslaw Rutkowski

Jerome Paulet

Marie-Constance Corsi

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.

Method for synchronizing a magnetic locating system

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.

Method for detecting an anomaly in the context of using a magnetic locating device

An optical pumping and isotropic measurement magnetometer. The magnetometer is all-optical in the sense that resonance between Zeeman sub-levels is induced by modulating the intensity or the frequency of the pump beam. Resonance is detected either using the pump beam itself or an unmodulated probe beam. The pump beam is linearly polarised and its polarisation direction is kept constant relative to the direction of the magnetic field to be measured, so that a measurement independent of the orientation of the field can be made.

All-optical and isotropic magnetometer

The invention relates to a magnetic field measurement device, including a detector () configured to measure the amplitude of an output signal at a harmonic of an oscillation frequency of an excitation source, said amplitude being proportional to the magnetic field (B) to be measured, characterised in that it comprises an excitation circuit configured to associate with a principal excitation source (Bcos&#x3c9;t) oscillating at a principal oscillation frequency at least one secondary excitation source (Bcos(&#x3c9;/3t+&#x3a6;)) oscillating at a secondary oscillation frequency that is a fraction of the principal oscillation frequency, said fraction being odd if said harmonic is odd, and even if said harmonic is even.

Method and device for measuring a magnetic field by synchronised excitations

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Seyssins, France

Francois Bertrand