Patent ID: 7374335
Filing Date: 2008-05-20
Classification: G01J,G01K

Abstract:
1. A temperature sensor in a chamber comprising: a test substrate removeably disposed in said chamber, said test substrate having a surface, said surface having a recess therein; a layer of luminescent material, disposed in the recess, that emits electromagnetic radiation having a detectable optical characteristic functionally dependent on the temperature of the test substrate; an optical window that seals said layer of luminescent material in the recess; a chuck disposed in said chamber; and an optical fiber light waveguide that penetrates the chuck, the optical fiber light waveguide having an end, wherein the optical fiber light waveguide is in optical communication with the layer of luminescent material and wherein there is a spacing between the end of the optical fiber light waveguide and the optical window such that the end of the optical fiber light waveguide does not touch the optical window or the layer of luminescent material, and wherein the test substrate is positioned in the chamber so that the layer of luminescent material faces the end of the optical fiber light waveguide that penetrates the chuck; and wherein the optical fiber light waveguide does not completely penetrate the chuck.