Open AccessSensitivity and sample shape related measuring effects on the MOLSPIN susceptibility anisotropy meter
Author(s) -
Hounslow M. W.,
Noel M.,
Bootes P. A.
Publication year - 1988
Publication title -
geophysical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0952-4592
DOI - 10.1111/j.1365-246x.1988.tb05906.x
Subject(s) - anisotropy , magnetometer , helmholtz coil , spurious relationship , sensitivity (control systems) , sample (material) , nuclear magnetic resonance , signal (programming language) , geology , noise (video) , condensed matter physics , acoustics , materials science , electromagnetic coil , magnetic field , optics , physics , mathematics , thermodynamics , statistics , engineering , electronic engineering , computer science , quantum mechanics , artificial intelligence , image (mathematics) , programming language
Summary The Helmholtz coil system of the MOLSPIN anisotropy delineator is shown to be partly sensitive to the specimen shape, particularly if the sample departs from the optimum shape. The effect is found to be most marked when measuring weakly anisotropic rocks which have an anisotropy below about 13 × 10 −12 m 3 and susceptibility less than 50 × 10 −10 m 3 . However, comparison of MOLSPIN data to measurements undertaken on low and high field torque magnetometers, suggest the results are not unduly affected by sample shape if the rock anisotropy signal is sufficient to dominate this spurious effect. Some suggestions are also made for minimising noise factors and thus improving instrument sensitivity.