PERFORMANCE
The performance of DELTATEST depends on the type of sensor
being used and the carrier frequency.
Characteristic for the sensors used by DELTATEST, is that the
expected result as well as limitations
easily can be calculated by a sensor constant named GK.
GK is chosen after the expected result depending on maximum
allowed surface structure.
The following simple conclusion has preliminary been set for
DELTATEST´s rotating sensor through
calculations and extensive testing.
A few unusal alloys can give exceptions due to variations in
the characteristics of the material,
i e the magnetic permeability.
Please, also see SPECIFICATION!
During 1999 initial measurements and preliminary
investigations have been conducted on material samples supplied
by potential costumers.
The present performance of DELTATEST is shown in the following
example of analogous crack registration
relating to these measurements.
These analogous registrations are real, and in no way manipulated.
There are no hidden thresholds or similar present.
We will continue to up-date with new registrations.
After separate agreement, TK performs tests on samples
supplied by final users.
Please note that it is more important that natural cracks
are used as reference cracks when you work with
smaller crack depths.
If you use artificial cracks, the width of the crack should be
considerably smaller than the actual depth,
since the lack of material, not only the crack, tends to be detected!
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