Fibre-optic measurement device, rate gyro, and inertial stabilisation and navigation unit
US9739614B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2013 |
| Grant date | Aug 22, 2017 |
| Priority date | — |
| Expiry date | Mar 15, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/726
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A fiber-optic measurement device (10) includes a SAGNAC ring interferometer (20) having a proper frequency fp, a detector (14) and a modulation chain (30) generating a phase-shift modulation φm(t) between the two counter-propagating waves (24, 25) propagating in the ring interferometer. The device aims to reduce measurement faults due to the linearity defects in the modulation chain of such a measurement device with optical fiber. For this reason, the fiber-optic measurement device reduces the amplitude of the phase-shift modulation φm(t) which is the sum of a first biasing phase-shift modulation component φb1(t) and a first counter-reaction phase-shift modulation component φcr1(t), the phase-shift modulation φm(t) falling or rising by twice the amplitude of the first biasing phase-shift modulation component φb1(t). A rate gyro including such a measurement device and an inertial stabilization or navigation unit including at least one such rate gyro are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.