Open AccessThe Modulation of a Proton Magnetometer Signal due to Rotation
Author(s) -
Hall S. H.
Publication year - 1962
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.1962.tb02258.x
Subject(s) - rotation (mathematics) , signal (programming language) , modulation (music) , amplitude , frequency modulation , physics , magnetometer , proton , nuclear magnetic resonance , amplitude modulation , precession , larmor precession , computational physics , optics , mathematics , mathematical analysis , acoustics , radio frequency , geometry , magnetic field , computer science , quantum mechanics , telecommunications , programming language
Summary Expressions for the amplitude and frequency modulation of the signal from a rotating proton precession magnetometer are derived by treating the net magnetization of the proton‐rich fluid as a simple dipole. The instantaneous frequency modulation is depicted in two sets of curves either of which can be used dependent upon the choice of angular quantities used to specify the instrument's attitude during rotation. In practice the frequency is measured by counting methods and this results in a mean frequency for the counting interval. An expression for the mean frequency is derived and the method of correction discussed.