３
Principle
of demagnetizing
Metals, even not magnetized, possess both the N and S polarities which are in a jumble
and stabilized repelling each other. N and S poles in a magnetic material* stand in line
under influence of external force. A magnetization is a phenomenon that polarities ap-
pear by N and S are standing in line.
This demagnetizer recovers standing-in-line polarities to the stable condition as before
by moving the alternating field away.
magnetic material*...substance which is influenced from magnetism
Measurement apparatus :
Gauss meter : GM-4000 manufactured
by Electromagnetic Industries Co., Ltd.
Sensor probe : T22078 manufactured
by Electromagnetic Industries Co., Ltd.
Distance and magnetic flux density, thermal controller
The following data shows the relationships between distance and magnetic flux density
.
This has an automatic thermal controller which limits the power and magnetism will fall to
20-30 mT when the coil becomes to excessively high temperature. Cool it spontaneously
down 15-20 minutes so that magnetism recovers the magnetic flux density before.
Regarding thermal controller
Magn
etis
m
of
tip (
m
T
)
Distance
(
mm
)
Magn
etis
m
of
tip (
m
T
)
Distance
(
mm
)
Magn
etis
m
of
tip (
m
T
)
Distance
(
mm
)
