Honeywell G.m.b.h.

Francis H Zeman

Wah L Lim

Harry A Gustafson

Disclosed is an improved method and apparatus for providing lock-in error reduction in ring laser angular rate sensors. Two independent feed back control systems are employed to independently alter the laser path of a ring laser angular rate sensor so as to obtain a minimum lock-in rate.

Laser gyro system

In the present application, an apparatus is provided for altering a ring laser angular rate sensor in such a way that the phase difference between the propagating waves therein includes lock-in error compensation. The apparatus of the present invention obtains a compensation output signal derived from the intensity of one or both of the propagating waves related to sensor lock-in error which can be utilized to alter the behavior of the ring laser so as to alter the behavior of the phase difference between the counter-propagating waves so that lock-in error contained therein is corrected.

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New Brighton, MN, United States of America

Francis H Zeman