Patent ID: 9709642
Date: 2017-07-18
CPC Classifications: G01R,G02F

Claim:
1. An optical pumping magnetometer comprising: a cell filled with a gas; a laser source emitting a light beam; a photodetector receiving the light beam that has passed through the cell and providing an electric signal; first and second coils having orthogonal axes, surrounding the cell and fed by a radiofrequency generator to generate a radiofrequency magnetic field therein; first regulating means receiving the electric signal and configured to regulate a frequency of the radiofrequency generator to a Larmor frequency; second regulating means configured to keep a direction of polarization of the light beam at an inlet of the cell orthogonal to the magnetic field to be measured; third regulating means configured to keep a direction of the radiofrequency field identical to the direction of polarization; and a liquid crystal polarization rotator receiving the light beam and configured to rotate a direction of polarization thereof, the polarization rotator being controlled by a control signal provided by the second regulating means.