Thickness measurement of varnish on PCBs

In order to protect PCBs from environmental influences such as humidity, they are coated with a protective clear varnish. This ensures error-free operation. The automotive industry in particular demands a minimum thickness for this protective coating.

Up to now, it was not possible to perform a measurement without destroying the target. Confocal sensors from Micro-Epsilon solve this measurement task without making contact with the target and therefore in a non-destructive manner. They provide
the thickness values in real time.

confocalDT IFS 2405 confocal sensors with a measuring range of 1 mm are used. These sensors are characterised by their extremely small measuring spot size of only 8 µm and excellent precision for measuring thin layers.