Accession Number : ADD016464

Title :   Closed Loop, Depolarized Interferometric Fiber Optic (IFOG) Gyroscope with Self Adjusting Serrodyne Phase Nulling.

Descriptive Note : Patent, Filed 4 Jun 90, patented 14 Jun 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Bramson, Michael D

Report Date : 14 Jun 1994

Pagination or Media Count : 13

Abstract : An interferometric fiber optic gyroscope employing an integrated, width polished, optic chip containing annealed proton exchange waveguides and a Mach-Zehnder interferometer for sensing a ramp induced signal from loop closing electronics to achieve a highly improved gyroscope scale factor linearity and dynamic range. An edge light emitting diode (ELED) operating at 1.3 micron wavelength is employed as the light source in the gyroscope. A decorrelator optical fiber segment is employed between the light source and the chip, and a Lyot depolarizer optical fiber segment is employed between the chip and one side of the fiber optic coil. Also, an intermediate output of the loop closing electronics is shown to have reduced scale factor sensitivity to light source wavelength change.

Descriptors :   *FIBER OPTICS, *GYROSCOPES, *INTERFEROMETERS, *PATENTS, *CLOSED LOOP SYSTEMS, *PHASE, *DEPOLARIZATION, COILS, DIODES, DYNAMIC RANGE, DYNAMICS, EDGES, ELECTRONICS, EXCHANGE, LIGHT, LIGHT EMITTING DIODES, LIGHT SOURCES, LINEARITY, LOOPS, OUTPUT, PROTONS, RAMPS, SCALE, SENSITIVITY, SIGNALS, WAVEGUIDES, WIDTH, CHIPS(ELECTRONICS), ANNEALING, DETECTION, SCALING FACTOR

Subject Categories : Navigation and Guidance
      Optics
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE