Method and apparatus for stabilizing control loop scale factor and gain in a fiber optic Sagnac interferometer
US5351123A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 9, 1992 |
| Grant date | Sep 27, 1994 |
| Priority date | — |
| Expiry date | Nov 9, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/726
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for stabilizing the scale factor and the loop gain of the control loop of a fiberoptic Saganc interferometer with phase resetting. A digital evaluation circuit includes two auxiliary control loops, one for nominal gain of the scale factor control and the other for stabilization of loop gain of the primary control loop, in addition to the control loop for the readjustment of the phase modulator. The evaluation circuit can be realized as an integrated circuit. In addition to the optimization of control bandwidth, the circuit avoids substantial complexity of the circuit subassemblies for generating modulation and demodulation signals and control signals for the scale factor control loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.