Abstract: The method measures the thickness of a hot glass body without direct contact with the glass body and is based on chromatic aberration. This method includes focusing a light beam from a light source on the hot glass body using a focusing device immediately after formation; conducting reflected light from the glass body into a spectrometer to obtain a reflected light spectrum; finding two wavelengths of the reflected light from the front side and the rear side of the glass body respectively at which reflected light intensities are maximum; determining the thickness of the glass body from the difference between the two wavelengths; maintaining the focusing device at a temperature below 120° C. during the measuring of the thickness and substantially preventing heat radiation from reaching the focusing device using at least one heat-blocking filter.

Abstract: The method measures the thickness of a hot glass body without direct contact with the glass body and is based on chromatic aberration. This method includes focusing a light beam from a light source on the hot glass body using a focusing device immediately after formation; conducting reflected light from the glass body into a spectrometer to obtain a reflected light spectrum; finding two wavelengths of the reflected light from the front side and the rear side of the glass body respectively at which reflected light intensities are maximum; determining the thickness of the glass body from the difference between the two wavelengths; maintaining the focusing device at a temperature below 120° C. during the measuring of the thickness and substantially preventing heat radiation from reaching the focusing device using at least one heat-blocking filter.

Abstract: A method for separating beads from a strand of plastic glass, which emerges continuously from a storage unit, wherein the glass strand passes a periodically controllable glass cutter, and the beads are separated from the glass strand in cutting phases. The separated beads are received by molds which are displaced beneath the glass cutter at a timed rate of conveyance, which is adapted to a cutting sequence of the glass cutter, an emerging speed of the glass strand and a desired size of bead. The control of the glass cutter includes, in the periods, two different cutting phases for alternately separating useful beads and waste beads, and the waste beads are easily discharged between the conveyed molds.