EDDY CURRENT
TESTING
Introduction
l This module is intended to present information on the
NDT method of eddy current inspection.
l Eddy current inspection is one of several methods that
use the
principal of “electromagnetism” as the basis for conducting
examinations. Several other methods such as Remote Field Testing (RFT), Flux Leakage and Barkhausen Noise also use this principle.
l Electromagnetic induction
l Generation of eddy currents
l Inspection applications
l Equipment utilized in eddy current inspection
Ø Probes/Coils
Ø Instrumentation
Ø Reference standard
l Advantages and Limitations
l Glossary of Terms
Electromagnetic Induction
l Eddy currents are created through a
process called electromagnetic induction.
l When alternating current is applied
to the conductor, such as copper wire, a magnetic field develops in and around
the conductor.
l This magnetic field expands as the
alternating current rises to maximum and collapses as the current is reduced to
zero.
Electromagnetic Induction (cont.)
If another
electrical conductor is brought into the proximity of this changing magnetic
field, the reverse effect will occur. Magnetic field cutting through the
second conductor will cause an “induced”
current to flow in this second conductor. Eddy currents are a form of induced
currents!
TERIMA KASIH
ATAS KUNJUNGAN SAUDARA
Ditulis oleh Hafez Fahrizal
- See more at: http://ilmuhafez.blogspot.com
