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:
May. 01, 1979
Filed:
Feb. 02, 1977
Thomas J Hutchings, Thousand Oaks, CA (US);
Litton Systems, Inc., Woodland Hills, CA (US);
Abstract
Three electrically isolated photosensitive diodes on a common substrate are located directly behind a multilayer dielectric coated mirror that is one of the reflective elements of a ring laser. A small percentage of the beams incident on the mirror is allowed to pass through and strike the photosensitive diodes. Two of the diodes are masked in such a way as to detect the heterodyne beat signal of two counterrotating beams in the ring laser and generate an output signal used to determine rate of rotation of the ring laser body. The third diode sums the intensity of the counterrotating beams and generates an output signal which goes to a feedback cavity length control circuit.