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:
Apr. 27, 1982
Filed:
Sep. 20, 1979
Anthony W Lawrence, Walpole, MA (US);
Northrop Corporation, Los Angeles, CA (US);
Abstract
A passive ring resonator laser gyro includes a thin film, passive waveguide adapted to provide a closed, substantially circular propagation path for optical signals. Couplers are provided for coupling coherent optical signals in opposite directions in the waveguide. Frequency controllers for each of the counter-rotating optical signals are adapted to adjust the frequencies of the respective signals in the waveguide to achieve resonance along the optical path encountered by each of the signals. Detectors provide signals representative of the frequency shifts of the two counter-rotating optical signals in the waveguide. These signals are nulled by servos which apply correcting frequencies to the frequency controllers. A difference network generates a rate signal corresponding to the difference in frequency between the signals applied to the controllers. The rate signal is representative of the angular rotation rate of the waveguide.