Method and apparatus for increasing the unambiguous sensing rang

Details Method and apparatus for increasing the unambiguous sensing rang Method and apparatus for increasing the unambiguous sensing rang

1987-06-30

1989-10-17

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356345, G01B 902

Patent

active

048742449

ABSTRACT:
A method and apparatus, utilizing multiple light signals, for extending the dynamic range of an interferometric system such as an optical fiber gyroscope based on dual wavelength measurement of the Sagnac phase shift in order to determine the fringe number of the interferometric fiber system, thereby increasing the unambiguous range of the device. An analogue measure of the fringe number is provided, thus eliminating the need for digital fringe counting or tracking. An apparatus is described for measuring absolutely, within certain upper bounds determined by the exact wavelengths used, the rotation rate when the system is powered up in a rotating frame.

REFERENCES:
patent: 4408882 (1983-10-01), Sheem
patent: 4444503 (1984-04-01), Schiffner
patent: 4707136 (1987-11-01), Kim
Lewin et al., "Two Wide-Dynamic-Range Signal-Recovery Schemes for the Fiber-Optic Gyroscope," IEE Proceedings, vol. 132, Pt. J, No. 5, Oct. 1985, pp. 271-276.
Kersey et al., "Two-Wavelength Fiber Gyroscope with Wide Dynamic Range," Electronics Letters, vol. 22, No. 18, Aug. 28, 1986, pp. 935-937.
Kersey et al., "Two-Wavelength, Wide-Dynamic Range Fiber Gyroscope,"SPIE Proceedings, vol. 719, Fiber Optic Gyros 10th Anniversary Conference, Sep. 24-26, 1986, pp. 135-140.

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