Fiber optic sagnac interferrometer with digital phase ramp resetting via correlation-free demodulator control
US5123741A · kind A · utility
11Cited by
2References
7Claims
0Family size
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Inventor
Key dates
| Filing date | Feb 6, 1991 |
| Grant date | Jun 23, 1992 |
| Priority date | — |
| Expiry date | Feb 6, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/726
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A fiber optic interferrometer rotation rate sensor is reset by phase ramp via a digital control circuit using as demodulation signal within the control circuit a signal (d) that is statistically independent of all parasitic signals and originates from a modulation signal generator that includes a random number generator. A reversal of the phase modulator signal is provided in a statistically distributed manner to integral values of .pi./2 of the interferometer characteristic. The arrangement avoids deadband and removes scale factor nonlinearities, particularly at low rates of rotation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.