What is the basic principle of vibration measurement by
BENTLY NEVADA vibration measurement system? and Why it
gives the -ve voltage output?
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Answer Posted / atta
An eddy-current probe works by passing an alternating
current through a coil of wire and measuring the coil’s
impedance(Resistance to flow of AC current). The coil is
supplied with a alternating current from the remote
eddy probe driver, which sets up an electro-magnetic field
between the tip and the observed surface.
When any electrically conductive material within this
electromagnetic field, ie. the target material, will have
eddy currents induced in it’s surface. These eddy currents
will vary produce there own magnetic field but in opposite
direction of probe field, and hence the impedance to
energising current, in proportion th the probe target
distance.
The sensing electronics in turn convert this impedance
change to a voltage, providing an electrical output
directly proportional to physical gap.
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