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:
Jan. 25, 2000
Filed:
May. 13, 1999
Jacky Y Rouhet, Saint Marcel, FR;
Gilbert M Tribillon, Besancon, FR;
Stephane F Bertrand, Besancon, FR;
Georges Boulon, Lyons, FR;
Abstract
The present invention relates to a device for optically measuring the temperatures of cryogenic 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 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+. The crystal is placed at an interior end of a housing constituting the probe. The fiber has a surrounding capillary being placed in the housing facing the covering. A chamber is defined between the end of the fiber and the covering. The housing includes an inlet orifice in the chamber perpendicular to the fiber axis and an outlet for a fluid in the chamber.