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...http://www.google.com/patents/US7414740?utm_source=gb-gplus-sharePatent US7414740 - Method and apparatus for contactless optical measurement of the thickness of a hot glass body by optical dispersion
