Our technical glossary on the topic of coating thickness measurement, material analysis and the characterization of surfaces.
The test method is based on the fact that all electrically insulating coating materials have a much higher disruptive strength than air. Pore detection occurs at the defective spots through a spark-over (short circuit) between the test electrode and the conducting base. A defective spot may be a thin air channel (pore, crack) or a coating that is too thin over the conducting base underneath.
Special filters optimise the energy distribution of the primary X-radiation for a given application, absorbing any undesired spectral components of the radiation. Depending on the instrument type, either individual fixed filters or removable multi-filters are employed.