2 results about "Optical current transducer" patented technology

The present application relates to a kind of stress line birefringence compensation method of optical current sensor, the optical current sensor includes laser source, polarizer, magneto-optical film, nanometer ring-shaped radial polarization grating, image beam and CMOS area array camera sequentially arranged in same optical path, the method includes the following steps: utilize laser source to emit light signal, under the action of current to be measured, the output signal of optical current sensor is superposed with Faraday magnetic rotatory angle θ And stress line birefringence δ, form synchronous rotating annular light spot;Determine the zero-crossing moment of the measured alternating current, the rotation angle of corresponding annular light spot is stress line birefringence δ at zero-crossing moment by CMOS area array camera and record;Based on the stress line birefringence δ of record, utilize model-free adaptive iterative learning method to predict the stress line birefringence δ of future time, and according to the prediction result, the output signal of optical current sensor is compensated.

The application discloses a kind of independent double strip optical current sensor and its anti outside temperature fluctuation interference method belonging to the field of intelligent measurement and sensing technology of electric power system.The sensor includes mutually connected sensing unit and signal processing unit, wherein the output end of multi-frequency modal decoupling signal processing device is connected with the input end of double strip optical current sensor signal processing device, the output end of double strip optical current sensor signal processing device is connected with the input end of measurement signal output device;Sensing unit is provided with double strip sensing unit main structure including measurement sensing optical path structure and temperature compensation sensing optical path structure, the vertical distance of the midpoint of measurement sensing optical path structure and temperature compensation sensing optical path structure to the current to be measured is equal.The application can realize the measurement function of temperature resistance while ensuring the long-term operation stability of single straight-through optical path type optical current sensor, and the advantages of simple structure.