METHOD AND DEVICE FOR MEASUREMENT OF MAGNETIC INDUCTION

摘要

The invention relates to an optical method and device for measurement of magnetic induction of small magnetic fields and small changes in magnetic fields of the order of ~ µGauss to ~ 10 Gauss based on Coherent Resonances at the Zeeman sublevels of a single hyperfine transition in alkali atoms. The atomic system is coherently excited by means of a laser source with a modulation of the light frequency with a frequency lower than 1 GHz. The modulation frequency at which the Coherent Resonances are registered is a measure of the induction of the existing magnetic field.