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Sensor system and method for characterizing a wet paint layer | Sensorsystem und Verfahren zur Charakterisierung einer nassen Farbschicht | Système de capteur et procédé de caractérisation d'une couche de peinture humide

Patentnummer:EP2899497B1
IPC Hauptklasse:G01B001106
Anmelder:
Erfinder:
Anmeldung:28.01.14
Offenlegung:28.01.14
Patenterteilung:13.03.19

Abstract / Hauptanspruch
A method of characterizing a wet paint layer 4a of a painted body 2 by paint layer parameters based on fitting to a physical model is provided. The method is carried out by a sensor system 1 in a non-contact manner, the sensor system comprising an emitter system 10 for emitting THz radiation, a detector system 20 for detecting THz radiation, and a processing unit 30 operationally coupled to the emitter system 10 and the detector system 20. The method comprises: Emitting, by the emitter system 10, a THz radiation signal 60 towards the painted body 2 such that the THz radiation interacts with the wet paint layer 4a, the wet paint layer 4a having not yet finished a drying process during which the wet paint layer becomes a dry paint layer; Detecting, by the detector system 20, a response signal 74 being the detected THz radiation signal 70 having interacted with the wet paint layer 4a; Determining model parameters of the physical model by optimizing the model parameters such that a predicted response signal of the physical model is fitted to the detected response signal, wherein the model parameters are indicative of optical properties of the wet paint layer 4a describing the interaction of the THz radiation signal with the wet paint layer 4a; and Determining, from the determined model parameters, the paint layer parameters, wherein the paint layer parameters include a predicted dry layer thickness of the wet paint layer 4a.

EP2899497B1


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