Method and Device for Measuring Magnetic Fields
First Claim
1. A method for measuring magnetic fields (B) based on the Zeeman effect using dark resonances, wherein quantum systems, e.g., atoms or molecules, of a measurement medium are irradiated with electromagnetic radiation at varying frequencies in a measurement cell (14) and excited during frequency tuning, thereby yielding a frequency splitting with a frequency shift (ν
- B) owing to the Zeeman effect, wherein a diminished fluorescent radiation is brought about, with a diminished absorption or increased transmission at a resonance frequency, the dark resonance, which depends on the magnetic field, and which is determined via the frequency tuning, so as to determine the magnetic field therefrom, characterized in that several dark resonances are coupled through the use of a polychromatic electromagnetic radiation (12), so that a frequency detection dependent only on the frequency shift triggered by the magnetic field is conducted for purposes of magnetic field measurement.
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Abstract
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 arranged 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.
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Citations
18 Claims
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1. A method for measuring magnetic fields (B) based on the Zeeman effect using dark resonances, wherein quantum systems, e.g., atoms or molecules, of a measurement medium are irradiated with electromagnetic radiation at varying frequencies in a measurement cell (14) and excited during frequency tuning, thereby yielding a frequency splitting with a frequency shift (ν
- B) owing to the Zeeman effect, wherein a diminished fluorescent radiation is brought about, with a diminished absorption or increased transmission at a resonance frequency, the dark resonance, which depends on the magnetic field, and which is determined via the frequency tuning, so as to determine the magnetic field therefrom, characterized in that several dark resonances are coupled through the use of a polychromatic electromagnetic radiation (12), so that a frequency detection dependent only on the frequency shift triggered by the magnetic field is conducted for purposes of magnetic field measurement.
- View Dependent Claims (2, 3, 4, 5)
- 6. A device for measuring magnetic fields based on the Zeeman effect, by means of dark resonance, with a measurement cell (14) that is exposed to the magnetic field (B) to be measured and contains atoms of a measurement medium in a buffer gas, a radiation source (11) being provided for the excitement thereof via irradiation, said radiation source connected with a modulation frequency generator and emitting an electromagnetic radiation with varying frequencies, and with a frequency detector (17) with a control loop (18) downstream from the measurement cell (14) for tuning the frequency to a dark resonance resonance frequency, characterized in that at least one modulator (22) for modulating a comparatively high first modulation frequency with a lower second modulation frequency with the generation of a double sideband structure is arranged downstream the modulation frequency generator (24), so that the electromagnetic radiation (12) modulated therewith provides for a coupling of several dark states, in which essentially only one frequency corresponding to the magnetic field-independent frequency shift is detected.
Specification