(E)/Peterson Instruments, Germany and Magnetic measurements, U.K.
The Advanced Variable
Field Translation Balance (AVFTB) is a modification of the horizontal magnetic
translation balance. In contrast to the normal horizontal translation balance in
the AVFTB the magnetic gradient is not produced by the special shape of the pole
pieces of the electromagnet, but by a separate set of gradient coils. The
generated gradient field is not kept constant, but is oscillating with a certain
frequency. The AVFTB can thus be considered a one-dimensional harmonic
oscillator with damping, operated in forced oscillation mode. The oscillating
part of the instrument is a pendulum with bifilar suspension with the sample
fixed to it. The motion of the system is excited by periodic force acting on the
sample and generated by the gradient coils.
The system is operated at resonance frequency to obtain highest sensitivity. The
motion of the sample is monitored by a linear voltage detector (LVDT). This
signal after processing in the PC is then proportional to the magnetic moment of
the sample. The Advanced VFTB introduces a special mode of operation that allows
the user to simultaneously measure the magnetic susceptibility.
Variable Field Translation Balance is a multipurpose high sensitivity
magnetometer for research and industry applications. It is particularly designed
for measurements of hysteresis loops diagrams, temperature IRM acquisitions,
remanence coercivity and thermo-magnetic curves. The AVFTB Electromagnet has a
strong maximum magnetization field (up to 12 k Oe = 1.2 T). Also it can
additionally do low temperature measurements down to -180 Deg.C (Liquid Nitrogen
temperature). The AVFTB Electromagnet is not equipped with an AFD unit.
new rock magnetic instrument is not just a CURIE BALANCE but an ultra sensitive
variable field translation balance (MMVFTB) that can perform many different
tasks. It can measure CURIE TEMPERATURES up to 800 deg C, VARIABLE TEMPERATURE
(-180 to + 800 deg C) IRM acquisition and BACK FIELD, and VARIABLE TEMPERATURE
(-180 to +800 deg C) HYSTERESIS LOOPS and MAGNETIC SUSCEPTIBILITY all fully
automatically using our sophisticated windows software. The instrument
facilitates to calculate Day and King plot parameters to assess magnetic
domains. The temperature bases remanence curves can be help to for magnetic
mineralogy in low quantity sample (up to 1000 mg).