The invention relates to a method and device for stabilizing the scale factor of a fiber optic gyroscope which has a superluminescent diode or a broadband multimode laser acting as a light source. According to the invention, the emission bandwidth irradiated from the light source into a fiber end is to be limited to an essentially narrower transmission bandwidth in the wavelength area of the intensity characteristic curve of the light by a narrow-band optical filter. The temperature of the filter is measured and the transmission broadband can be quickly corrected during use of optical interference filters by means of a pre-calibrated look-up table. The readjusted wavelength value is used for calculating the scale factor.

Method and device for stabilizing the scale factor of a fiber optic gyroscope

A gyroscope system comprises a gyroscope block having a plurality of cavities and a plurality of passages that define a path; a plurality of mirrors each located in one of the plurality of cavities; at least one mirror drive coupled to one of the plurality of mirrors and configured to change a position of the respective mirror, wherein the path's length is changed by the change in the position of the respective mirror; a dither system coupled to the gyroscope block and configured to induce an angular rotation of the gyroscope block; and a controller configured to provide a dither signal indicative of a dither frequency to the dither system and a path length control (PLC) signal indicative of a PLC frequency to the at least one mirror drive. The controller is configured to calculate the PLC frequency as a function of the dither frequency.

Variable path length control modulation frequency

An integrator in a ring laser gyro that produces an output for changing the path length is reset synchronously with a gyro dither signal to reduce gyro errors from the dithering operation during the reset

Reducing dither induced errors from path length control resets in a ring laser gyro

An integrator in a ring laser gyro that produces an output for changing the path length is reset synchronously with a gyro dither signal to reduce gyro errors from the dithering operation during the reset.

Steven C. Albers

Papers

Reducing dither induced errors from path length control resets in a ring laser gyro

Reducing dither induced errors in a ring laser gyro