FIBRE-OPTIC VOLTAGE METER

摘要

FIELD: measurement equipment.SUBSTANCE: invention relates to electrical power engineering, and namely to measurements of high voltages by means of optic devices. A meter contains a sensitive element in the form of a pair of identical piezocrystal cylinders connected with their end faces so that electric axes E of their piezocrystals are coaxial and directed in opposite directions. Each cylinder is wound with single-mode optic fibre. Optic fibres are optically connected to a Michelson interferometer by means of a directed optical fibre coupler made as per a three times three diagram. Each optic fibre is connected with one of its end faces to a coupler port. Faraday mirrors are installed on other free end faces of optic fibres. A laser radiation source is optically connected to the coupler port through a circulator. Photoelectric detectors are connected to coupler ports. A one-directional output of the circulator is connected to the third photoelectric detector. Photoelectric detector outputs are connected through an analogue-to-digital conversion unit to a programmable digital processing unit. A temperature sensor arranged in close proximity to a sensitive element includes a receiving and transmitting laser module. A transmitting port and a receiving port of the module are optically connected through a coupler made as per a two times two diagram to an optic fibre coil, in the end face of which a reflecting mirror is installed. A free port of the coupler is plugged with a reflector.EFFECT: higher measurement accuracy.2 cl, 1 dwg