Measurement Of Electric Field Based On Electrostriction Effect By Means Of Bragg Gratings

Electric field of measurement is necessary to understand electromagnetic environment and optimize high voltage electrical equipments. In order to study the status of equipment operation, it is needed to understand the frequency electric field in the internal and on the surface of the equipment. This paper combines the existing methods of measuring the electric field at power frequency, expresses the theory of principle of optical fiber electric field sensor based on electrostrictive materials, researches on the design and production process, and carries out experimental research.First of all, the paper analysis measuring AC electric field and DC field is feasible. It proves the measurement method based on fiber-optic electric field sensing principle of electrostriction effect and comes out the relationship between induced voltage and electric field strength. Then, the detection of spherical electric field sensor system is discussed, including the electric field probe, demodulation circuit and transducer design. By using simulation software and calculation method, we get response data of the electric field measurement system, which would be compared with experimental result. We do the reasearches in the different electric field strength and get the the relationship between induced voltage and electric field strength. The experiment shows that:Under the industrial frequency AC fields, transducer material and its applied voltage show a good linear relationship, the lagging effect is not obvious. Induced signal of the spherical probe in the electric field is also a linear relationship with the electric field strength, which meets the experiment of premise. The above results meeting the requirements, we do the the whole system output characteristic test, the output response system is linear to the electric field strength, which achieves the expected requirements of the experiment. Experimental results indicate that the experiment repeatability, high reliability, reached the electric field measurement purposes. Spherical probe measurements under DC electric field verify that switching circuit eliminats the effect of the residual charges, high-impedance case is very good slowed the charge of leakage; we achieve the DC electric field measurements.