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:
Jun. 09, 1987
Filed:
Nov. 09, 1981
Herbert J Shaw, Stanford, CA (US);
Ralph A Bergh, Palo Alto, CA (US);
Herve C Lefevre, Palo Alto, CA (US);
The Board of Trustees of the Leland Stanford Junior University, Stanford, CA (US);
Abstract
A fiber optic rotation sensor, employing the Sagnac effect, comprises all fiber optic components, positioned along a continuous, uninterrupted strand of fiber optic material. The rotation sensor includes a detection system utilizing a modulator for phase modulating light waves which counterpropagate through a loop formed in the fiber optic strand. The modulator is operated at a specific frequency to eliminate amplitude modulation in the detected optical output signal. The rotation sensor is mounted in a .mu.-metal housing to shield it from the effects of ambient magnetic fields. An isolator is utilized to prevent the optical output signal from returning to the laser source. This advantageously reduces power losses in the system by eliminating the need for a coupler to couple the output signal to a detector.