Multiple axis ring laser gyroscopes

Details Multiple axis ring laser gyroscopes Multiple axis ring laser gyroscopes

1986-04-25

1988-08-09

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964

Patent

active

047624159

ABSTRACT:
In a multiple axis ring laser gyroscope in which one or more of the laser cavity corner mirrors is or are shared by different cavities and in which the laser beams in these different cavities operate at the same nominal frequency, scattering of the beam in one cavity into another cavity by the shared mirror(s) may produce disadvantageous lock-in effects. To at least lessen this possibility, the frequencies of the beams in the gyroscope disclosed herein are offset one from another, the offset being sufficient to affect lock in but not so great that the frequency of any beam is overly far from the lasing medium gain curve center. The frequency offsets may be produced by introducing offset bias signals into some channels of the gyroscope path length control servosystem.

REFERENCES:
patent: 4397027 (1983-08-01), Zampiello et al.
patent: 4407583 (1983-10-01), Simms
patent: 4477188 (1984-10-01), Stiles et al.
patent: 4585346 (1986-04-01), Ljung

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