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. 05, 1978
Filed:
Jul. 14, 1977
Ray O Waddoups, Valencia, CA (US);
International Telephone and Telegraph Corporation, New York, NY (US);
Abstract
A thermometer arrangement in which the active element is a block of birefringent material between two optical planar polarizers. Light energy from a source is conducted through a fiber optic light conductor through the input polarizer, the birefringent element, the output polarizer, and via a second fiber optic light conductor, into a light-to-electrical transducer. Polarization plane rotation effected by the birefringent element in combination with the fixed polarizers effectively modulates the light intensity from an arbitrary level (such as substantially zero at some selected temperature) so that the transducer output signal is a function of temperature. A reference accounting for light source variations, etc. is provided by a separate fiber optic conductor, a second transducer, and a differential detector. Linearizing means are also shown.