Optical measuring system used for measuring field intensity of direct-current electric field

Abstract

The invention relates to an optical measuring system used for measuring field intensity of a direct-current electric field and belongs to the technical field of direct-current electric field measuring. In the optical measuring system, an output end of a laser source is connected with an input end of an integrated electric field sensor based on common path interference through an input polarization maintaining optical fiber, and optical signals modulated through the electric field are photoelectrically converted by an optical fiber transmission-in detector; an air source after entering an electromagnetic reversing valve gates airflow of two air ways and is input into a rotating device to drive a drum to rotate bidirectionally; a driving circuit drives an electromagnetic valve to realize current conversion. The rotating device at the front end is made by a nonmetal material, so that distortion to a to-be-measured field is reduced; all devices in the optical measuring system are connected flexibly, so that flexibility in measuring mode is improved; a control circuit, the driving circuit and the optical measuring system are isolated fully, so that the optical measuring system is less prone to electromagnetic interference, and accuracy and reliability of measuring results are improved. By the optical measuring system, direct-current electric field distribution on the surface of an object can be measured nearly, so that range of electric fields which can be measured is expanded.

Description

technical field [0001] The invention relates to an optical measurement system for measuring the field strength of a direct current electric field, and belongs to the technical field of direct current electric field measurement. Background technique [0002] DC electric field measurement is widely used in engineering applications and scientific research fields, and it is of great significance to the diagnosis of electrical equipment and the improvement of power transmission efficiency. At present, the research on the measurement method of DC electric field has been widely carried out at home and abroad. According to the measurement principle, it can be divided into two categories: optical method and electrical method. [0003] The electrical measurement method is mainly based on the principle of electromagnetic induction. Usually, the method of rotating or vibrating the induction blade is used to convert the DC electric field into an alternating electric field, forming a rota...

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Problems solved by technology

However, the above-mentioned electrical measurement method has two disadvantages: first, the field strength meters used are all active devices, which contain electronic circuits, and are prone to failure due to electromagnetic interference in strong electric fields and harsh measurement environments; second , the field strength meter contains metal parts inside, which will cause distortion of the original field at the field point during measurement, which will greatly affect the accuracy of measurement

However, due to the need for AC motors, mechanical transmissions, etc., the scope of application is limited to laboratory environments

And because the equipment is sophisticated and complex, it is difficult to apply to industrial sites

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