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:
Aug. 07, 2001
Filed:
Mar. 03, 2000
John W. Berthold, Salem, OH (US);
Larry A. Jeffers, Alliance, OH (US);
McDermott Technology Inc., New Oreleans, LA (US);
Abstract
An apparatus and method for sensing temperature within a broad temperature range, includes a fiber optic having an etalon at one end for reflecting light supplied at an opposite end by a pair of light sources operating at different wavelengths. The light sources are either applied to the optical fiber at different times for discriminating between the wavelengths and producing a temperature signal based on the two wavelengths, or the light is simultaneously applied to the optical fiber from both sources and thereafter divided into its component wavelengths before reflected and reference light detectors detect light signals at the different wavelengths. Known etalon/optical fiber based temperature sensors having a usual maximum temperature range of 500° C. are thus modified to increase their range to as much as double this range.