In-flight scale factor calibration of ring laser gyro systems
US5076694A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 11, 1991 |
| Grant date | Dec 31, 1991 |
| Priority date | — |
| Expiry date | Feb 11, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C25/005
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.