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Electric field intensity measuring system based on Pockels effect

A technique of electric field strength, measurement system

Inactive Publication Date: 2015-01-28
XI AN JIAOTONG UNIV +1
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  • Abstract
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Problems solved by technology

[0004] Although optical-based measurement methods have great advantages, due to high requirements for optical path design and processing technology, the development of optical-based measurement methods has been relatively slow

Method used

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  • Electric field intensity measuring system based on Pockels effect
  • Electric field intensity measuring system based on Pockels effect
  • Electric field intensity measuring system based on Pockels effect

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] The invention is based on the Pockels electro-optic effect, that is, the change of the refractive index of the optical crystal is proportional to the intensity of the electric field. Under the action of the external electric field, the incident light beam enters the crystal and decomposes into two linearly polarized lights whose polarization directions are orthogonal to each other along the direction of the sensing axis. Due to the difference in the refractive index of the two main axis directions, a corresponding phase difference will be produced after the light wave propagates a certain distance in the crystal, which will cause its polarization state to change. Therefore, by figure 1 The method shown detects the change of the phase angle to realize the electric field strength measurement.

[0025] A kind of Pockels probe of t...

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Abstract

The invention relates to an electric field intensity measuring system based on the Pockels effect. The system comprises a polarizer, a 1 / 4 wave plate, a Pockels crystal and an analyzer, and the polarizer, the 1 / 4 wave plate, the Pockels crystal and the analyzer are sequentially arranged along a light path. The polarization direction of the polarizer and the polarization direction of the analyzer are orthogonal. The system further comprises a light source, optical fibers and a post-processing unit. The optical fibers comprise a light incoming side optical fiber and a light emitting side optical fiber. The post-processing unit comprises a photoelectric detector and an oscilloscope, and the photoelectric detector and the oscilloscope are connected. A scheme for solving the problem that a traditional optical discrete device is not practical is disclosed. A Pockels probe is formed after binding relative components of the measuring system such as the polarizer, the analyzer, the 1 / 4 wave plate, the Pockels crystal and an optical fiber collimator. The system solves multiple problems that light paths are not easy to control by a traditional system based on the optical discrete device, the system is prone to being interfered by outside conditions and system stability is poor, promotes the optical electric field measuring technology to be converted to actual application, and promotes development of the electric field measuring technology.

Description

【Technical field】 [0001] The invention belongs to the field of electric field intensity measurement, and in particular relates to an electric field intensity measurement system. 【Background technique】 [0002] Electric field strength is an important parameter in the field of high-voltage electrical insulation. Accurate determination of electric field strength is very necessary for optimizing the structural design of high-voltage electrical equipment and understanding its surrounding electromagnetic environment. With the development of computer and numerical simulation technology, although the electric field strength can be determined by numerical calculation methods, the electromagnetic environment conditions of electrical equipment in actual operation are quite complex, and the simulation calculation results have a large deviation from the actual electric field distribution. Therefore, direct measurement is The most effective and reliable means of determining electric field...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/08
Inventor 穆海宝苏国强宋佰鹏张冠军邓军波廖一帆
Owner XI AN JIAOTONG UNIV
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