Direction switched mode-locked laser gyroscope

Details Direction switched mode-locked laser gyroscope Direction switched mode-locked laser gyroscope

1998-06-15

1999-10-19

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

372 6, G01C 1972

Patent

active

059698160

ABSTRACT:
This invention relates to a laser gyroscope. This invention provides a direction-switched mode-locked laser gyroscope, comprising: a laser resonator including a laser gain medium and an optical path, one end of the resonator being connected to a reflector and the other end of the resonator being composed of a Sagnac loop; wherein the gyroscope is operated by pulses generated from an optical switch connected to the Sagnac loop. The laser gyroscope according to the invention has a better durability than a conventional He-Ne type laser gyrocope. It can produce an output signal which can be processed more simply than that of the interferometric fiber-optic gyroscope since the output signal is characterized by frequencies corresponding to the rotation rate. The gyroscope operates to produce a pulse output, reducing lock-in effect compared with a gyroscope producing continuous wave output.

REFERENCES:
patent: 5108183 (1992-04-01), Fling et al.
patent: 5453836 (1995-09-01), Kim et al.
patent: 5684590 (1997-11-01), Sanders et al.
M.Y. Jeon et al., "Mode-locked Fiber Laser Gyroscope", Optics Letters, pp. 320-322, vol. 18, No. 4, 1993.
W.W. Chow et al., "The Ring Laser Gyro", Rev. Of Mod. Phys., pp. 61-107, vol. 57, No. 1, 1985.
R.A. Bergh et al., "An Overview of Fiber-Optic Gyroscopes", Journal of Lightwave Technology, pp. 91-107, vol. LT-2, No. 2, 1984.

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