公开(公告)号：EP2158496A2

公开(公告)日：2010-03-03

申请号：EP08756818.4

申请日：2008-06-12

申请人： Technische Universität Graz ,  Forschungsholding TU Graz GmbH

发明人： LAMMEGGER, Roland

IPC分类号： G01R33/032 ,  G01R33/26

CPC分类号： G01R33/032 ,  G01R33/26

摘要： The invention relates to a method which makes use of the Zeeman effect for measuring magnetic fields, by way of dark resonances. According to said method, a measuring cell (14) is exposed to the magnetic field (B) to be measured and contains the atoms of a measuring medium in a buffer gas, a radiation source (11) being provided for exciting the atoms by radiation and being connected to the modulation frequency generator and emitting electromagnetic radiation with different frequencies. A frequency detector (17) is mounted downstream of the measuring cell (14) and comprises a control loop (18) for the frequency tuning to a dark resonance frequency. The invention is characterized in that at least one modulator (22) for modulating a comparatively high first modulation frequency with a lower second modulation frequency, thereby producing a double sideband structure, is mounted downstream of the modulation frequency generator (24) to couple a plurality of dark resonances using the electromagnetic radiation (12) modulated therewith, substantially only one frequency being detected according to the magnetic field-dependent frequency shift.