| JR-6
/ JR-6A Models The JR-6
version is destined for simple measurement of remanent
magnetization with manual change of measuring positions
of the specimens. According to the accuracy demands, one
can measure the specimen in two, four or six positions.
The JR-6A (automated)
version is destined for rapid and accurate measurement of
remanent magnetization. The specimen is manually only
inserted into the specimen holder and the changes of
positions in the holder in order to get complete vector
are made automatically by the instrument.
General
Description
The JR-6/JR-6A Spinner Magnetometer
consists of a pick-up unit, whose most important part is
a pair of Helmholtz coils, and a measurement control
unit. All functions are microprocessor - controlled. The
microprocessor controls measurement, carries out digital
filtration of the signal, controls and tests the speed of
specimen rotation.
The JR-6/JR-6A automatically
executes tests for erroneous conditions. The measurement
process is fully controlled a PC compatible computer.
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Operating
Principles Rock
specimen rotates at a constant angular speed in the
pick-up unit inside a pair of Helmholtz coils. In the
coils an AC voltage is induced whose amplitude and phase
depend on magnitude and direction of the remanent
magnetization vector.
Typical JR-6 /
JR-6A Applications
Palaeomagnetism:
The changes of Earth’s magnetic field in geological
history can be investigated through the measurement of
rock’s remanent magnetization and the investigation of
its stability. These data are also applicable to dating
the age of rocks, to solving some tectonic problems or
particular terrains (rotations of terrains, microplates),
to dating the developments of mineralizations of ore
deposits and to many geological problems.
Archaeomagnetism: The
changes of the Earth’s magnetic field in human history
can also be investigated. These investigations are mostly
applicable to dating archeological materials.
Magnetometry: In
the interpretation of ground or airborne magnetometric
measurements it is useful to know whether the rock’s
magnetization is due to its induced or remanent
component. Investigation of remanent magnetization can
help to solve this problem.
Mineralogy: Using
special capsule enabling smaller irregular specimens to
be measured, impurities of ferromagnetic grains in para-
or diamagnetic minerals can be investigated.
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