Electric field sensor
US5574805A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | May 11, 1995 |
| Grant date | Nov 12, 1996 |
| Priority date | — |
| Expiry date | May 11, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R29/0885
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electric field sensor comprises an electric field sensor head (3) for varying an intensity of a propagating light beam in response to an electric field intensity of an input signal received by a reception antenna (1). The electric field sensor head (3) comprises an incident optical waveguide (9), two phase-shift optical waveguides (10) having a variable refractive index which varies in response to the electric field intensity, an outgoing optical waveguide (11) and, at least one modulation electrode (12) formed in the vicinity of at least one of the two phase-shift optical waveguides (19). The electric field sensor further comprises a circuit element (2) connected between the modulation electrode (12) and the reception antenna (1). The modulation electrode (12) has a thickness not smaller than 1 .mu.m. The modulation electrode (12) may comprise a plurality of split electrodes which are split in a light propagating direction and which are capacitively coupled. The reception antenna (1) is preferably implemented by a low radiation resistance antenna.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.