Thermal Spray coating thickness measurement through Laser Photothermal technology

Product information

Geoffrey Bruno, g.bruno@precitec.de; 
Precitec Enovasense 

https://doi.org/10.53192/ITSC2026530

While thermal spray coating processes are increasingly used in high-end industrial applications, the coating thickness measurement techniques available are limited, unprecise and difficult to implement.
Innovative Laser Photothermal technology is bringing unequalled possibilities for such measurements. 
A laser beam is shot on the surface of the coating which is this way heated in a fully nondestructive way. The generated heat wave is then diffusing back and forth within the coating. Then an infrared sensor is collecting the thermal flux coming back from the surface. By measuring the delay between the laser sent and the collected thermal flux, the system can determine the thickness of the coating.
The main advantages of this method are that it is nondestructive, contactless, fast, compact and simple to integrate and implement.
From aerospace thermal barriers to medical implant ceramic layers or automotive engine cylinder coatings among many others, this technology has been successfully implemented in various thermal spray processes.
Indeed, since the laser can heat almost all materials deposited through thermal spray processes, the measurement becomes possible on many coatings and substrates combinations that are else impossible to measure nondestructively.

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Erscheinungsdatum

March 2026

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