METHOD AND DEVICE FOR MAGNETIC FIELD MEASURING EMPLOYING COHERENT RESONANCES OF A SUPERFINE TRANSITION INTO ALKALINE METALS

摘要

The invention relates to an optical method and device for the measurement of small magnetic fields in the order of ~microGauss to ~10 Gauss and of small changes in the magnetic field within the same order, based on coherent resonances of superfine transition into alkaline metals, wherein the alkaline atomic system is coherently excited by a laser source by direct modulation of current with frequency under 1 GHz, the frequency at which the coherent resonances are registering being the measure for the existing magnetic field. The method has high spatial resolution, by which measuring of higher prevision is made at much smaller initial power. The device comprises a diode laser (1) the radiation (2) of which gets across a set of alkaline atoms (4), the fluorescence (5a) and the laser power (5b) getting across them of which are registered in a system of fluorescence (6a) registration, and in a system of registration of the power (6b) passed through, respectively. The signals of these systems are processed by a processor (7). For measuring the direction of the magnetic induction and of small changes of the magnetic fields, the device contains an additional system of screening or compensation of the outer magnetic fields (8) and a system for supplying a calibrated magnetic field (8) and a system for supplying a calibrated magnetic field (9). 16 claims, 6 figures