Open AccessA new spinner magnetometer: principles and techniques
Author(s) -
Kono Masaru,
Hamano Yozo,
Nishitani Tadashi,
Tosha Toshiyuki
Publication year - 1981
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1981.tb02744.x
Subject(s) - magnetometer , fluxgate compass , fast fourier transform , amplifier , acoustics , electronic engineering , microcomputer , computer science , electrical engineering , capacitive sensing , sample (material) , physics , nuclear magnetic resonance , engineering , algorithm , magnetic field , chip , cmos , quantum mechanics , thermodynamics
Summary Design scheme, theory of operation, and practical techniques of a new spinner magnetometer are developed and tested. In this apparatus, a pair of bevel gears are used to rotate the sample simultaneously around two orthogonal axes, and magnetic signals are picked up by a fluxgate sensor, amplified by a programable gain amplifier, and sampled by an analogue ‐ digital (AD) converter at timing signals from a rotary encorder. Magnetic signals contain many frequency components corresponding to dipole terms, quadrupole terms, and so on, and calculation of magnetization can be done by the fast Fourier transform (FFT) technique. As there is no need to replace the sample during a measurement, this new magnetometer is easily adapted to digital control and automatic measurement using a microcomputer. These possibilities are briefly discussed.