Rotary optical electric field sensor and method for measuring electric field by the same

Abstract

The invention, which belongs to the technical field of electric field measurement, discloses a rotary optical electric field sensor and a method for measuring an electric field by the same. The sensoris composed of a laser diode driver, a laser diode, an optical electric field sensing head, a photoelectric detector, a signal processing system and a photoelectric rotational speed sensor. A metal sensing polar plate senses a to-be-measured electric field strength; an optical signal arrives at the photoelectric detector through the rotating optical electric field sensing head; the photoelectricrotational speed sensor measures the rotation speed of the sensing head; and an electrical signal outputted by the photoelectric detector and a rotating speed of the photoelectric rotational speed sensor are sent to the signal processing system respectively. In addition, according to the method for measuring an electric field, noises in a signal are filtered based on a Kalman filter algorithm; theprocessed signal is transmitted to the voltage signal processing unit to obtain an alternating-current component and a direct-current component by separation; and then a regulation amount and a to-be-measured electric field strength are obtained. According to the invention, influences on the sensor stability by factors like the light intensity and temperature as well as the influence on the sensor measurement precision by the charge drift can be eliminated; and the measurement precision is improved.

Description

technical field [0001] The invention belongs to the technical field of electric field measurement, in particular to a rotary optical electric field sensor and a method for measuring electric field. Background technique [0002] In recent years, with the substantial increase in the operating voltage level of the power grid, electric field measurement has been widely used in power systems, such as: status monitoring of power transmission and transformation equipment, reasonable selection of electrical equipment, high-voltage testing and corona discharge research, high-voltage system Electromagnetic environment analysis, etc. Due to the shortcomings of large volume, difficult insulation, narrow response frequency band, and small dynamic range, traditional electric field measurement devices cannot meet the needs of modern power measurement. The optical electric field sensor uses crystal material as the sensing medium, and realizes the measurement of the electric field by utiliz...

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Problems solved by technology

However, this method is only suitable for AC electric fields, and cannot eliminate the influence of charge drift and space charge on sensor output

For the measurement of DC electric field, the modulation signal only has DC components and does not contain AC components, so it is difficult to improve sensor performance through the above methods

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