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:
Aug. 11, 1981
Filed:
Apr. 16, 1979
Matthew N McLandrich, Carlsbad, CA (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A method and apparatus for zero fringe shift referencing has unique appliion in an optical fiber interferometer gyroscope. Passive optical couplers introduce pulsed laser energy into the interferometer's main loop and a much smaller loop encircling a negligible area. An output signal from the smaller loop is representative of a zero rotation rate while the output signal from the much larger main interferometer loop is representative of an unknown rotation rate. The zero rotation rate and unknown rotation rate signals are compared and referenced so that there can be compensation for the response variation of the photodetectors or the source of laser energy to enable more accurate responsive readouts.