Digital Holography for Inspection of Drying Processes of Paint Films

Abstract

The techniques to investigate drying processes of paint and ink dot using digital holography is presented. The proposed technique based on holographic interferometry can analyze local variation of paint films in drying process by using a phase change between two subsequent reconstructed complex amplitudes of the reflected light from the film. The technique has been applied to assess the drying process of commercial paint. For the tiny ink dot having diameter of a few hundred micrometers, digital holographic microscopy can be applied to monitoring a variation of ink dot surface in the drying process. This paper describes the outline of these holographic techniques and shows some experimental results for commercially available paint and ink.