| 摘要 |
The invention refers to an optical sensor for measuring the AC/DC electric fields. The suggested sensor may be used in air or in different fluids without affecting the electric field. The main industrial application of the sensor is measuring in real time the health of the HV component used in the AC/DC transmission line or in the electricity transmission substance. The optical polarimetric sensor for measuring the electric field is formed of at least a "z- cut" LiNbO3 electro-optic crystal as sensitive optical material (10). a probe (6), with physical axes parallel with the crystal axes, whose birefringence characteristics are modulated by the electric field in contact, as well as a light source (1), an optical fibre (2) and some dielectric analysis components, including a GRIN lens (7), a polaroid (8), a retarder plate λ/4, (9), a dielectric mirror (12) and a photo diode (5) protected by a dielectric case (13, 13'). The device also includes a Y derivation (3) for transmitting a light source to the probe T (6) and from it to the photo diode (5), coupled to an optical fibre (2) coupling (4), and inside the probe (6) the electro-optical crystal (10) is framed by the polaroid (10) and the retarder plate λ/4, (9), of the one part and the retarder plate λ/8, (11) and the dielectric mirror (12) of the other part; in order to align the light beam wit this analyzer assembly, the GRIN lens (7) with attached optical fibre (2) is introduced in a cased block (14) aligned with the polaroid (8). As part of a real invention example, the GRIN lens (7) with attached optical fibre (2) is fixed in a dielectric sphere (15) perforated axially, that can rotate between two plates (16) and (17) fixed in the cased block (14). |
