Scale factor stability control

Details Scale factor stability control Scale factor stability control

1986-02-18

1988-04-26

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

372 94, 372 29, G01C 1964

Patent

active

047400854

ABSTRACT:
In a ring laser gyroscope the sum and the difference of the two opposed beam intensities is utilized, in a first implementation, to correct gain non-linearity, and in a second implementation, to adjust tuning mirror positions to minimize non-linear gain output. In a third implementation one or two external mirrors can be used to feed back into the cavity to produce linear gain output, again using the sum and difference of the two opposed beam and the phase angle between the two beams. Accordingly, the sum and the difference of the beam intensities and their phase angle is used to compensate for the laser gain and loss dependent terms and for the back-scattering terms which heretofore have been caused errors in the readout.

REFERENCES:
patent: 3323411 (1967-06-01), Killpatrick
patent: 3697181 (1972-10-01), Macek et al.
patent: 4422762 (1983-12-01), Hutchings et al.
patent: 4551021 (1985-11-01), Callaghan et al.

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