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:
Mar. 17, 1992
Filed:
Feb. 28, 1991
Roger Hill, Midlothian, GB;
GEC-Ferranti Defence Systems Limited, Midlothian, GB;
Abstract
The gyroscope had a closed optical path (10) defined by four reflecting surfaces (11, 12, 13, 14). Counter-rotating beams of radiation circulating around the closed path are produced by a gaseous active lasing medium executed over a gain region (15) to produce a discharge in the gas. A reciprocal dispersion element (18) is located in the optical path and a solenoid (23) is wound around part of the gain region to produce a magnetic field over that region. One of the reflecting surfaces (14) is a partially transmitting mirror which passes a small proportion of the radiation incident upon it, and detectors (19, 20) detect radiation in each counter-rotating beams passing through the mirror (14). The alternating current components of the outputs of the detectors are used to control a control circuit (22) so as to control the magnetic field produced by the solenoid (23).