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Pennsylvania
State University
Department
of Electrical Engineering
MRI
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Our labs are equipped
with various kinds of measurement instruments and
systems, ranging from a standard bh loop tracer to a
self-built magnetoelastic resonance meter. All
measurement instruments in our labs are fully automated
with computers, so we can conduct our experiments
efficiently. From time to time, we also build and program
our own measurement systems for the needs of our
experiments. Listed below are some of our major
instruments, which are busy collecting data 24 hours a
day, 7 days a week.
 BH Loop Tracer
The
SHB BH loop tracer is designed for measuring the BH
hysteresis loop of a magnetic thin film (square or
circular) with size no larger than 2" in diameter.
This system is also equipped with a specially designed
pick-up coil system that allows it to measure the
magnetostriction of magnetic thin films.
(Click on the picture to see the complete BH loop tracer)
 Magnetoelastic Resonance Meter
(Frequency-Domain)
Our
self-made Magnetoelastic Resonance Meter (MERM) is used
to measure the resonant frequency of a vibrating
magnetoelastic thick film and wire. The system shown in
the picture detects the resonant frequency of the
magnetoelastic sample by exciting the sample through an
excitation Helmholtz coil and recording the response of
the sensor through a pick-up coil. The pick-up coil can
be attached to a humidity and temperature chamber,
allowing the sample to be interrogated at various
humidity and temperature levels. This system is fully
automated with a PC; hence the response of the sample can
be recorded over the duration of weeks or even months
without any close supervision. (Click on the picture to
see the complete MERM)
 Magnetoelastic Resonance Meter
(Time-Domain, Portable)
The
function of this self-made MERM portable system is
similar to the frequency-domain MERM system - it is also
used to detect the resonant frequency of a magnetoelastic
sample. However, instead of sweeping the frequency and
recording the response of the sample one frequency at a
time, this system excites the sample with a sinewave for
a short duration (~25ms), records the time-domain
response (the ring-down response) of the sample, and then
converts the time-domain signal to frequency domain by
performing FFT. As a result, the measurement time for
this system is significantly reduced, generally less than
100ms. (Click on the picture to see the complete portable
MERM)
 Vibrating Sample
Magnetometer
(Click
on the picture to see the complete VSM)
 Thermal Evaporator
(Click
on the picture to see the complete Evaporator)
There
are still many measurement systems in our labs, which at
this time are not available on this webpage. Please check
back this page soon to see the updates.
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Questions or comments?
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Last Date Modified: Tuesday, January 29, 2002
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