Contactless determination of coating features

A method of contactless determining one or more features of a coating with one or more layers, the method comprising:

• operating an ingress-protected coating scanner in a measurement unit to cause an ingress-protected transmitter of the ingress-protected coating scanner to emit a scanning radiation, and to cause an ingress-protected receiver of the ingress-protected coating scanner to sense an interaction radiation caused by interaction of the scanning radiation with the one or more layers of the coating;
• operating an ingress-protected vibration explorer in the measurement unit to cause an ingress-protected emitter of the ingress-protected vibration explorer to emit an exploration radiation, and to cause an ingress-protected sensor of the ingress-protected vibration explorer to sense a reflection radiation caused by reflection of the exploration radiation on the coating to detect a vibration of the coating depending on the sensed reflection radiation;
• operating a determiner unit to cause determination of the one or more features of the coating depending on the interaction radiation sensed by the ingress-protected coating scanner and the vibration detected by the ingress-protected vibration explorer;
• the scanning radiation being reflected by at least one mirror towards a common radiation direction with the exploration radiation and the interaction radiation being reflected by at least one mirror towards the ingress-protected receiver;
• or
• the exploration radiation being reflected by at least one mirror towards a common radiation direction with the scanning radiation and the reflection radiation being reflected by at least one mirror towards the ingress-protected sensor;
• each of said mirrors being included in an optical arrangement in the measurement unit.