Abstract
A method of displaying simultaneously the real and imaginary parts of the complex initial susceptibility of rocks and rock powders is described. A Q-multiplier in conjunction with two feedback loops separates distinctly and linearly the contributions of the real component, X' and imaginary component X of a given sample. Temperature variations of susceptibility may also be studied using a furnace. In the absence of the furnace the sample's coupling factor and hence the signal-to-noise ratio of the instrument is substantially enhanced. At present the noise level of the X loop is equivalent to +or-5*10-12 m3 and that of the X loop is equivalent to +or-1.4*10-11 m3 with the furnace in position. The sample volumes are 0.2 cm3 or less.
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