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:
Feb. 06, 2001
Filed:
Dec. 28, 1998
Abstract
The optical device for detecting in situ traces of gaseous hydrogen in an environment at cryogenic temperature, using a sensor having a fine film of palladium whose optical properties vary as a function of the concentration of hydrogen in contact with the film comprises, a palladium micromirror deposited in the form of a film at a first end of a first optical fiber, a first light source emitting a light signal at a predetermined wavelength into a second end of the first optical fiber, and means for detecting the light signal as modified after passing in contact with the palladium micromirror disposed in the environment at cryogenic temperature, processor circuits for responding to variation in the intensity of the light signal contacting the palladium micromirror to determine hydrogen concentration, and means for localized heating of the palladium micromirror, by light radiation so as to keep the palladium of the micromirror in its &agr; phase.