Method for determination/compensation of bias errors/random walk errors induced by the light source in fiber-optic Sagnac interferometers
US7324206B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 25, 2004 |
| Grant date | Jan 29, 2008 |
| Priority date | — |
| Expiry date | Dec 2, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/721
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determination of/compensation for the bias/random walk errors induced by the light source in fiber-optic Sagnac interferometers employing a modulation method for stochastically independent shifting of the operating point to the points of highest sensitivity. A reference beam is output from the light beam emitted from the light source of the interferometer and passed to the fiber coil to produce a proportional reference intensity signal. Such signal is demodulated with the demodulation pattern of the rotation rate control loop to demodulate the rotation rate intensity signal (proportional to rotation rate). The demodulated reference intensity signal measures the bias/random walk errors to be determined. Demodulation of the reference intensity signal is simultaneous with that of the rotation rate intensity signal so that components of the reference and rotation rate intensity signals (each resulting from light components simultaneously emitted from the light source) are identically demodulated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.