Phase and intensity modulated IFOG
US6445455B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 2000 |
| Grant date | Sep 3, 2002 |
| Priority date | — |
| Expiry date | May 23, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/726
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A phase and intensity modulated IFOG has a light source responsive to an intensity modulation signal for providing an intensity modulated light signal. A Sagnac interferometer has a fiber optic coil. The coil receives and circulates a clockwise and counter-clockwise beams. The Sagnac interferometer is responsive to an intensity modulated light signal at a first input port, and to a phase modulation signal at a phase modulation input terminal for outputting a non-reciprocal interference signal. A PSD detector system responds to the non-reciprocal interference signal and provides a demodulated bias signal. An intensity signal generator has an output that provides the intensity modulation signal. A phase signal generator provides the phase modulation signal to the phase modulation input terminal. The intensity signal generator and the phase signal generator have a common frequency. The phase difference &thgr; between the phase modulation signal and the intensity modulation signal is adjustable in response to at least a first control signal. A computer with a digitizing sampler is coupled to receive and digitize successive sample values of the demodulated bias signal. The computer exec…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.