Fibreoptical sensor
US5053693A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1990 |
| Grant date | Oct 1, 1991 |
| Priority date | — |
| Expiry date | Dec 21, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R29/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In an interferometric fiberoptic sensor with homodyne detection for measuring electrical fields or voltages, the measurement signal is compensated separately from operating point control. The measurement signal originating from the electrical field is compensated in a piezoelectric modulator (5) which consists of modulator elements which are identical with the at least one sensor element (3) with respect to material, geometric shape and crystal orientation. Additional separate apparatus (4) with a sufficiently large phase swing are provided for operating point control. Modulator element and sensor element (3) are essentially at the same temperature so that the temperature-dependence of the matter constants of the sensor element and the temperature-dependence of the fiber interferometer are eliminated. The sensor preferably operates in accordance with the principle of a fiberoptic two-mode interferometer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.