Accession Number : ADD012320

Title :   Analog Fiber Gyro with Extended Linear Range.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Burns,William K ; Moeller,Robert P

Report Date : 04 Mar 1986

Pagination or Media Count : 11

Abstract : 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 L1R1/lambda1 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 L2R2/lambda2 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)

Descriptors :   *PATENTS, *GYROSCOPES, *FIBER OPTICS, ANALOG SYSTEMS, VOLTAGE CONTROLLED OSCILLATORS, LINEAR SYSTEMS, DYNAMIC RANGE, FLYING PLATFORMS, LIGHT SOURCES, RANGE(DISTANCE), CONTROL, MEASUREMENT, PLATFORMS, QUANTITY, OVERLAP, SIGNALS, OUTPUT, LINEARITY, PULSE COUNTERS, ROTATION, FREQUENCY, FIBERS, PULSES, RATES, COILS

Subject Categories : Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE