Electro-optic electromagnetic field sensor system with optical bias adjustment
US5963034A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1997 |
| Grant date | Oct 5, 1999 |
| Priority date | — |
| Expiry date | Nov 20, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/032
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electro-optic electromagnetic field sensor system includes an electro-optic sensor located at an electromagnetic field sensing site for detecting an intensity of an electromagnetic field. The sensor changes an optical measuring signal received from a laser source to an optical sensor signal representative of the electromagnetic field intensity. An optical bias adjust unit optically coupled to the laser source adjusts the bias operating point of the electro-optic sensor responsive to an electrical bias adjust signal which includes a test signal component. A detector optically coupled to the electro-optic sensor converts the optical sensor signal to an electrical sensor signal and detects a feedback signal indicative of the transfer function of the electro-optic sensor operating on the test signal component. A bias control circuit electrically coupled to the optical bias adjust unit generates the bias adjust signal responsive to the feedback signal. An optical input fiber couples the optical measuring signal from the laser source to the electro-optic sensor and an optical output fiber couples the optical sensor signal to the detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.