GIA – Gob Temperature Measurement
The GIA camera has a built-in GTM for measuring the temperature along the length of the gob. For each scan (slice), a temperature measurement is made on about an 8 mm wide spot in the centre of the gob. All the temperature measurements can be shown superimposed on the image divided into up to 12 zones.
Two-colour pyrometer
A two-colour pyrometer highlights the temperature profile throughout the gob. It has a number of advantages over one-wavelength pyrometers. It features the insensitivity to variations in the emissivity of the glass and minimizes the influence of signal attention caused by dust and smoke, closely associated with the gob forming process.
GIA pyrometer principle
The GIA pyrometer works in a wavelength spectrum where most types of glass materials are semitransparent. This means that the radiation originates from the volume of the gob rather than from the surface, as is the case with ordinary glass pyrometers detecting radiation from a narrow band of around 5 microns.
