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. 29, 2011
Filed:
May. 18, 2007
David O. Fellows, Largo, FL (US);
Ying Tan, Arden Hills, MN (US);
Timothy J. Callaghan, Roseville, MN (US);
Christina M. Schober, St. Anthony, MN (US);
David O. Fellows, Largo, FL (US);
Ying Tan, Arden Hills, MN (US);
Timothy J. Callaghan, Roseville, MN (US);
Christina M. Schober, St. Anthony, MN (US);
Honeywell International Inc., Morristown, NJ (US);
Abstract
A method for maintaining measurement accuracy of a ring laser gyroscope is disclosed. The method involves periodically measuring a path length control voltage in the ring laser gyroscope over a prescribed temperature range. When a first path length controlled by the path length control voltage deviates at least one wavelength from a nominal path length, the method detects the change in the path length as a mode shift. For each mode shift, the method applies a path length correction to maintain the first path length at a target path length over the prescribed temperature range. The method can apply a correction to a measurement signal output of the ring laser gyroscope by adjusting a calibrated scale factor depending on an actual integer number of wavelengths achieved during a mode shift.