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 / m. saqib ali nafees
AN EDDY-current probe works on the basic magnetic principles
(Faraday's law and lenz's law) when an electrically
conductive material comes close to the probe we know that
alternating current pass though coil this alternating
current produce EMF in electrically conductive material
(observed surface) by Faraday's law. This produced EMF
oppose its source by lenz's law. ( when the current through
a coil changes and an induced voltages is created as a
result of the magnetic field, the induced voltages in such a
direction that its magnetic effect will oppose the Change
that produce it.) The output voltage vary according to gap
between probe and observed surface by these two laws.
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