film thickness monitor crystals

[Ben Buse]

Hi

Do all coaters use the same film thickness monitor crystals? Where do people buy replacements from? Or how do they clean them?

[Ben Buse]

Has anyone tried these https://uk.megatech.com/pack-of-10-crystals-au-6mhz-pe108-02

[Ben Buse]

Ok this site suggests https://www.microtonano.com/EM-Tec-quartz-crystals-for-thickness-monitor-controllers-for-vacuum-coating-systems.php two types a 6Mhz and 5Mhz with different diameters with brands using different ones as shown in table

[Probeman]

Hi

Do all coaters use the same film thickness monitor crystals? Where do people buy replacements from? Or how do they clean them?

Maybe it's too "old school" but I've always had great success using the color on polished brass method for checking carbon evaporation thickness:

https://smf.probesoftware.com/index.php?topic=1252.msg8988#msg8988