Honeywell International Inc.

Other

Leroy O Thielman

Rodney H Thorland

Stanley A White

Joseph E Killpatrick

Timothy J Callaghan

Theodore W Broberg

Thomas A Savard

Douglas A Chamberlin

Clifford T Molaskey

Richard G Beaudet

Brittan L Zurn

A ring laser gyroscope is described which includes a laser cavity configured to provide an optical laser path for a pair of counter-propagating laser beams, an optical sensor configured to receive a portion of the energy from the counter-propagating laser beams, and a unit configured to receive outputs from the optical sensor. The unit is configured to utilize the output to generate at least a residual path length control signal, a laser intensity monitor signal, and readout signals.

Single sensor ring laser gyroscope

A system, circuit and method are disclosed for operating a Ring Laser Gyroscope (RLG) off-mode-peak to avoid exciting undesirable transverse modes. An alternate PLC operating point can be used to bias the optical path length of the RLG to an appropriate side of an ideal integer number of wavelengths, and thus avoid exciting the undesirable transverse modes. Although this alternate PLC operating point is not perfect with respect to establishing an integer number of wavelengths, this operation provides acceptable performance of the RLG's (in particular, short length path RLG's), and acceptable margin can be established relative to variations in the PLC set points involved.

System, circuit and method for off-mode-peak operation of ring laser gyroscopes

An apparatus for controlling an amplitude of a signal generated from a digitized sinusoid of rapidly and widely varying amplitude is described herein. The apparatus includes a two stage gain adjuster which produces a gain adjusted signal, a phase shifter which converts the gain adjusted signal into two gain adjusted output signals separated in phase by 90 degrees, a power estimation unit to estimate the power of the gain adjusted signal, and an adjusting unit to adjust a gain of the gain adjuster according to a power estimate from the power estimation unit and a desired output signal power.

Methods and apparatus for automatic gain control

Apparatus for improving the bias stability of a ring laser gyro by selecting a secondary transverse mode and controlling the path length of the gyro to maintain the selected mode.

Transverse mode selected operation for a ring laser

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Shoreview, MN, United States of America

Leroy O Thielman