Methods Used by the NDU System
The NDU system uses a variety of different methods in parallel:
- Measurement of the potential noise of a pair of electrodes inside the
object. The electrodes may be of similar material as the walls, or one of
both may be dissimilar.
- Measurement of the current noise between a pair of electrodes inside
the object. Again, the electrodes may be of similar material as the walls,
or one of both may be dissimilar.
- Measurement of the wall potential
- Measurement of galvanic DC currents (only for electrode pairs made
of similar material)
- Measurement of the polarisation resistance using a pair of
electrodes, of which one is of similar material as the wall.