Wavelength sensor for fiber optic gyroscope

Details Wavelength sensor for fiber optic gyroscope Wavelength sensor for fiber optic gyroscope

1991-05-28

1994-11-15

Buczinski, Stephen C.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

372 94, G01B 902, H01S 3083

Patent

active

053653386

ABSTRACT:
An error compensated Mach-Zehnder Interferometer wavelength sensor integrd fiber optic chip for scale factor correction of fiber optic gyroscopes. A 90.degree. twisted optical fiber polarizer 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.ANG. without temperature stabilization or output conditioning over the entire temperature range of operation.

REFERENCES:
patent: 4514088 (1985-04-01), Coccoli
patent: 4678334 (1987-07-01), Coate et al.
patent: 4708480 (1987-11-01), Sasayama et al.
patent: 4842358 (1989-06-01), Hall
patent: 4984861 (1991-01-01), Suchoski, Jr. et al.

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