Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1989-09-11
1991-04-02
Wallace, Linda J.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01B 902
Patent
active
050043447
ABSTRACT:
Digitized heterodyne signals in a ring laser gyroscope are processed to determine the phase and acceleration of heterodyne signals at turnarounds in the angular motion of the frame of the ring laser. A hybrid analog/digital design that incorporates the necessary logic processes the turnaround data to produce a phase correction that can be added to the gyroscope count to correct phase errors that at each turnaround. Separation of high speed data processing from lower rate data simplifies the code and permits evaluation of turnaround correction performance. A fully digital system determines a phase distribution for the detected turnarounds and processes the phase distributions of the heterodyne signals for a multiplicity of turnarounds to determine an angle towards which the phase distributions are skewed and the amount of that skew. A phase correction is then calculated to compensate for turnaround-induced errors in measurements of phase differences between the two beams as a function of the skew angle and the amount of skew of the phase distribution.
REFERENCES:
patent: 4648716 (1987-03-01), Egli
patent: 4875774 (1989-10-01), Tazartes et al.
Mark John G.
Mathews Anthony
Tazartes Daniel A.
Litton Systems Inc.
Wallace Linda J.
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