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Air-core induction-coil magnetometer design

1982; IOP Publishing; Volume: 15; Issue: 10 Linguagem: Inglês

10.1088/0022-3735/15/10/034

2051-5685

K -P Estola, Jaakko Malmivuo,

Sensor Technology and Measurement Systems

This paper discusses the theory of optimising an induction-coil magnetometer and the realisation problem. The optimisation is based on a simple magnetic model of the source, an induction coil and a current-to-voltage converter. The electric models and characteristic equations needed for the optimisation procedure have been derived from prevailing theories. The equations have been modified for computer-aided design. This procedure maximises the signal-to-noise ratio of the magnetometer. The results have been verified by constructing and measuring the optimised magnetometer and its parameters. The theory has also been used to construct a differential magnetometer which improves the single-coil magnetometer performance considerably in magnetically noisy environments. Some magnetocardiographic (MCG) measurements have been carried out in the laboratory environment.