Method of measuring temperature of a sheet with a noncontacting-type pyrometer
AssigneePPG Industries, Inc.
InventorRonald L. Schwenninger
Life of this patent
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Abstract
A noncontacting-type pyrometer for measuring the temperature of a glass ribbon has a hot junction at the center of a circular black body adjacent a first surface thereof and a layer of thermal insulating material on the opposite second surface. The radius (a) of the black body, the spacing (b) of the pyrometer from the glass ribbon and the thickness (c) of the black body is selected to satisfy the equation b<a/5c in order that the temperature of the black body as measured by the hot junction is approximately the temperature of the glass ribbon.
Claims7
A noncontacting method of measuring temperature of a sheet, comprising the steps of:
- providing a heat absorbing member having an essentially flat major surface and adjacent peripheral surface portions;
- mounting the major surface of the member a spaced distance from the sheet;
- and
- measuring the temperature of a preselected region of the member adjacent the major surface of the member when the member and the sheet are at thermal equilibrium wherein thermal aspect ratio defined as the ratio of (1) the spaced distance between the preselected region of the member and closest peripheral surface portion of the member and (2) the spaced distance between the member and the sheet is at least about 0.5.
Dependencies are inferred from the claim text.