Analog Fiber Gyro with Extended Linear Range.
DEPARTMENT OF THE NAVY WASHINGTON DC
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A gyroscope system for obtaining an extended linear dynamic range for platform rotation rate measurements comprising a first fiber optic gyroscope with a first optical fiber coil described by a first quantity L1R1lambda1 where L1 is the length of the first optical fiber coil, R1 is the radius of the first fiber coil, and lambda 1 is the light source wavelength, this first quantity being chosen to provide a linear output for a first range of small rotation rates of the platform a second fiber optic gyroscope with a second optical fiber coil described by a second quantity L2R2lambda2 with this second quantity being chosen to provide a linear output for a second range of large rotation rates of the platform, with this second range partially overlapping the first range voltage controlled oscillators for converting the gyroscopes signals to pulse frequency signals a circuit for determining whether a reference rotation rate within the overlap between the first and second ranges has been reached and generating a control signal in accordance therewith a pulse counter and a switch for switching one or the other of the pulse frequency signals to the pulse counter in accordance with the control signal so that a gyroscope which is operating within its linear range is utilized. Author
- Fiber Optics and Integrated Optics