Abstract
When measuring weak magnetic fields, a container containing a medium, such as a solution containing a stable radical, is placed in a polarising magnetic field, which is essentially at right angles to the field to be measured. The polarising field is interrupted rapidly, the interruption being preceded by the impression of a high-frequency electromagnetic signal. The frequency of the signal corresponds to the resonance frequency of the free electron spin. The frequency and amplitude of the precessing nuclei, which are a function of the strength of the measured field, are recorded by a pick-up coil.
| Original language | English |
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| IPC | G01R 33/ 28 A N |
| Patent number | WO9517684 |
| Filing date | 29/06/1995 |
| Country/Territory | International Bureau of the World Intellectual Property Organization (WIPO) |
| Priority date | 22/12/1993 |
| Priority number | DK19930001431 |
| Publication status | Published - 29 Jun 1995 |