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:
Sep. 12, 1995
Filed:
Jun. 16, 1993
Kabushiki Kaisha Toshiba, , JP;
Abstract
A temperature distribution measuring apparatus, which inputs pulsed-light into an optical fiber, measures backward Raman-scattered light generated in the optical fiber, and calculates a temperature distribution along the optical fiber in accordance with the ratio of the intensity of anti-Stokes' light to the intensity of Stokes' light of the backward Raman-scattered light. The apparatus comprises an optical filter for extracting the anti-Stokes' light and Stokes' light from the backward Raman-scattered light, an optical attenuator for attenuating the Stokes' light extracted by the optical filter, an optical switch for receiving the anti-Stokes' light extracted by the optical filter and the Stokes' light output from the optical attenuator, and selectively outputting one of the anti-Stokes' flight and Stokes' light, a light-receiving element for detecting the intensity of the light output from the optical switch, an amplifier for amplifying an analog electrical signal produced by the light-receiving element, an amplified analog-to-digital converter for converting the analog electrical signal into a digital signal, and a signal processor for measuring the temperature distribution along the optical fiber by processing the digital signal.