Balanced dual servo VCO passive ring laser gyroscope
US4830495A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1987 |
| Grant date | May 16, 1989 |
| Priority date | — |
| Expiry date | May 1, 2007 |
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 means to provide a sharply tuned single frequency light source to the second resonator cavity. The single frequency light source is sharply tuned and is split to form first and second sources. The second resonator cavity is a passive high Q cavity having a closed second optical path. The two light sources are fed to the second resonator and propagate as CW and CCW beams within the second resonator. A first servo channel tunes the frequency of the CW beam to a resonance peak. A second servo channel tunes 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 algebraicly added to provide a passive cavity path length difference servo signal which is integrated. A SECOND ADDER adds the integrated passive cavity difference signal to the reference signal (Fm) to provide the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.