The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 09, 1999
Filed:
Mar. 29, 1995
Jacky Y Rouhet, Saint Marcel, FR;
Gilbert M Tribillon, Besancon, FR;
Stephane F Bertrand, Besancon, FR;
Georges Boulon, Lyons, FR;
Societe Europeenne de Propulsion, Suresnes, FR;
Abstract
The present invention relates to a device for optically measuring the temperatures of cryogenic fluids or of moving surfaces in such fluids by analyzing the decay in the luminescence of a doped crystal, the device comprising a light source for exciting said crystal, an optical fiber for transporting the light flux emitted by said source to the crystal and for returning to a detection assembly the luminescent light emitted by the crystal as a result, and a measurement probe past which the fluid or the moving surface moves, wherein the doped crystal is constituted by one of the crystals from the group comprising strontium fluoride doped with divalent ytterbium, SrF.sub.2 :Yb.sup.2+ ; and calcium fluoride doped with divalent ytterbium, CaF.sub.2 :Yb.sup.2+. In a preferred embodiment for measuring the temperatures of moving surfaces, the measurement probe includes a fiber for transmitting the light flux emitted by the light source plus at least one receiver fiber for returning the light emission given off by the doped crystal which is presented in the form of a crystal covering covering a determined location on the surface to be scanned, each of said fibers being surrounded by a metal capillary.