Monitoring of the Porcelain Firing Conditions by Optical Methods

Abstract

It is proposed that the redox conditions for firing porcelain be monitored in situ (‘on site’) according to the reflection spectra in the UV-VIS-NIR region. It is shown that the difference in terms of the color characteristics of glazed porcelain is correlated with reflection at λ ~ 1100 nm, which depends on the ratio Fe²⁺/Fe³⁺ predominantly in the composition of the glaze. It was found that as the intensity of the luminescence band due to the optically active center Fe³⁺ increases, the reflection coefficient of the glazed porcelain at λ ~ 1100 nm also increases.