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ACPD
Advantages
of TSC's ACPD
Certain ACPD versions take the current
input and voltage measurement functions and combine them into a
single probe. In TSC equipment these are generally kept apart. This
allows the current input points to be widely separated to produce
a more uniform electric field giving more accurate sizing. In addition
this approach allows many voltage probes to be associated with a
single input current for monitoring purposes.
General advantages of ACPD include:
- Works on any metal type, including welds.
- Probes are inexpensive. This makes the technique ideal for monitoring,
on-site or in a laboratory environment, using spot-welded pins.
- Very small increments in crack depth can be detected by comparing
readings taken periodically with the same fixed probe.
- Provides a detailed crack profile, including information on
on crack bridging.
- In a metal with large skin-depth,
compared to the voltage probe size, inclination of the crack to
the metal surface can be estimated.
- The a.c. skin effect concentrates currents at the surface so
the currents required are much smaller than for d.c. potential
drop.
- Defect depth can be measured with no upper limit.
ACPD
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