Method and apparatus for measuring weak magnetic fields.

Jan Henrik Ardenkjær-Larsen

Method and apparatus for measuring weak magnetic fields.

Jan Henrik Ardenkjær-Larsen (Inventor)

Department of Electrical Engineering

Research output: Patent

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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
IPC	G01R 33/ 28 A N
Patent number	WO9517684
Filing date	29/06/1995
Country	International Bureau of the World Intellectual Property Organization (WIPO)
Priority date	22/12/1993
Priority number	DK19930001431
Publication status	Published - 29 Jun 1995

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title = "Method and apparatus for measuring weak magnetic fields.",

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.",

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AB - 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.

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