Accession Number : ADD017375

Title :   Wavelength Sensor for Fiber Optic Gyroscope.

Descriptive Note : Patent Filed 28 May 91, patented 15 Nov 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Bramson, Michael D

Report Date : 15 Nov 1991

Pagination or Media Count : 10

Abstract : An error compensated Mach-Zehnder Interferometer wavelength sensor integrated fiber optic chip for scale factor correction of fiber optic gyroscopes. A 90 deg twisted optical fiber polariter couples the light from a point in the gyroscope optical fiber circuit where light is found to have traversed the optical sensing coil of the gyroscope in both directions to the input of the fiber Optic Mach-Zehnder Interferometer. The light output of the interferometer is converted to electrical signals which are used to servo lock the peak depth of phase modulation of the interferometer and provide a digital output corresponding to the wavelength change sensed by the gyroscope temperature and input power variations otherwise adversely affecting the gyroscope performance are thus compensated. Gyro resolution is maintained to within 1 Angstrom without temperature stabilization or output conditioning over the entire temperature range of operation. (MM)

Descriptors :   *FIBER OPTICS, *OPTICAL CIRCUITS, *GYROSCOPES, *PATENTS, TEMPERATURE, OPTICAL INTERFEROMETERS, OPTICAL DETECTORS, ROTATION, DEMODULATORS, PHOTODIODES, LIGHT MODULATORS, PHASE MODULATION

Subject Categories : Navigation and Guidance
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE