In-flight scale factor calibration of ring laser gyro systems

Details In-flight scale factor calibration of ring laser gyro systems In-flight scale factor calibration of ring laser gyro systems

1991-02-11

1991-12-31

Turner, Samuel

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

372 94, G01C 1966

Patent

active

050766945

ABSTRACT:
In-flight scale factor calibration of a ring laser gyro is encumbered by the dependence of scale factor on light beam intensity and by the susceptibility of the intensity monitor to decalibration. The monitor may be calibrated in flight by modulating the mirror alignment, the laser current, or both to modulate the intensity. The intensity modulation produces a modulation of the scale factor. The ratio of the amplitude of scale factor modulation to the amplitude of the measured intensity modulation should be the same in-flight as during factory calibration. If it is not, the intensity monitor is calibrated by multiplying its output by the change in the ratio, and the calibrated intensity measurement rather than the raw intensity measurement is used to determine the scale factor.

REFERENCES:
patent: 4634283 (1987-01-01), Mark et al.
patent: 4740085 (1988-04-01), Lim
patent: 5012081 (1991-04-01), Jungwirth et al.

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