Method for detecting fault of optical fiber gyro and apparatus for diagnosing fault of the same
US5701177A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Feb 4, 1997 |
| Grant date | Dec 23, 1997 |
| Priority date | — |
| Expiry date | Feb 4, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/721
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A phase modulated light is propagated through an optical fiber sensing loop, from which a propagated light is obtained. The propagated light is converted to an electric signal, from which a fundamental wave component and even number harmonic wave components of a phase modulating signal for the phase modulated signal are detected. In accordance with the changes of the fundamental and even number harmonic wave components, fault is detected. On the other hand, the electric signal may be integrated to provide an integrated signal. In accordance with the comparison between the integrated signal and a fault reference voltage, the fault may be detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.