Method for stabilizing the phase modulator transfer function in closed loop interferometric fiber optic gyroscopes
US5914781A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1997 |
| Grant date | Jun 22, 1999 |
| Priority date | — |
| Expiry date | Dec 31, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/72
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This invention relates to an improved method and mechanism for eliminating acceleration-dependent errors and loop interaction effects in gain-stabilized, closed-loop, interferometric fiber optic gyroscopes. Such method and mechanism include enabling the modulation gain accumulator and disabling the rate accumulator on every occurrence of ramp flyback if the gyroscope is operating below a certain velocity threshold and enabling the modulation gain accumulator and disabling the rate accumulator on one out of every N occurrences of ramp flyback if the gyroscope is operating above a certain velocity threshold. Such method and mechanism also includes use of proportional circuitry to scale the magnitude of the bias modulation component to be a percentage of the serrodyne ramp voltage and the DC component to be zero volts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.