Measurement of rotation rate using sagnac effect
US4411526A · kind A · utility
2Cited by
1References
2Claims
0Family size
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Key dates
| Filing date | Apr 29, 1983 |
| Grant date | Oct 25, 1983 |
| Priority date | — |
| Expiry date | Apr 29, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/72
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a Sagnac effect optical fibre gyroscope, which uses a phase nulling photo detection technique to drive a feedback loop controlling one or more non-reciprocal elements connected in series with the coil, a commutating switch reverses the direction of propagation of oppositely directed beams of light directed through the coil and non-reciprocal elements. The null balance is detected as the absence in the photodetector output of any a.c. component in phase or out of phase with the commutation switching. This removes a source of systematic error occasioned by drift in optical parameters of unbalanced components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.