Sourced locked frequency modulated dual servo PRLG
US5112128A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1988 |
| Grant date | May 12, 1992 |
| Priority date | — |
| Expiry date | Dec 8, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/727
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A passive ring resonator gyroscope comprising a single piece body having an integral first and second resonator cavity. The first resonator cavity contains a single frequency laser that provides a sharply tuned single frequency light source to the second resonator cavity. The single frequency light source is split to form first and second sources. The second resonator cavity is a passive high Q cavity with a closed second optical path. The two light sources are fed into the second resonator and propagate as CW and CCW beams within the second resonator. A first servo channel develops a first control signal to tune the frequency of the CW beam to a resonance peak. A second servo channel develops a second control signal to tune the CCW beam to its resonance peak. By converting both servo error outputs into frequency, the relative frequency difference between the CW and CCW beams are recorded as the frequency shift in response to the body rate rotation about the sensitive axis. The first and second control signals are algebraically added to provide a linear laser difference servo signal which is integrated, to provide a passive cavity servo signal or, in an alternative embodiment, a la…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.