Optical fiber electric field sensor based on F-P interference principle and method thereof

Abstract

The invention relates to an optical fiber electric field sensor based on the F-P interference principle. The sensor comprises an optical fiber electric field sensor body which is connected with an adjustable direct-current voltage source and an optical fiber sensor demodulator. The optical fiber sensor demodulator is connected with a computer. The manufacturing method of the optical fiber electricfield sensor comprises the following steps: inserting an optical fiber into a ceramic contact pin, and cutting a plastic plate into a circle with the same diameter as the piezoelectric ceramic piece;drilling a hole in the center of the plastic plate, and inserting the ceramic contact pin into the hole in the plastic plate; and arranging the piezoelectric ceramic piece and the plastic plate withthe ceramic contact pin in a stainless steel tube. The method for measuring by using the optical fiber electric field sensor comprises the following steps: introducing a direct-current voltage source;when the piezoelectric ceramic piece is subjected to an external electric field, enabling the piezoelectric ceramic piece to be subjected to telescopic deformation in the thickness direction; transmitting the data to the computer through a demodulator to obtain the variable quantity of the cavity length; and solving the electric field intensity according to the deformation quantity and an inversepiezoelectric coefficient. The sensor has the advantages of simple structure, small size, high precision and high response speed.

Description

technical field [0001] The invention belongs to the technical field of electric field measurement, and in particular relates to an optical fiber electric field sensor based on the F-P interference principle and a method thereof. Background technique [0002] Electric field detection is widely used in many fields such as aerospace, power system, meteorological detection, and medical treatment. For example, in the field of aerospace, in order to ensure the safe launch of spacecraft, the aerospace department will monitor the space electric field in real time before the launch of the spacecraft to avoid serious damage caused by natural lightning strikes to the spacecraft; in the field of power systems, accurate measurement The electric field around the power equipment is of great significance to the safe operation and design and manufacture of power equipment; in the field of meteorology, the measurement of the ground and air atmospheric electric field can obtain accurate meteor...

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Problems solved by technology

The current optical electric field sensor is mainly based on the photoelectric effect, which has the disadvantages of complex optical path and large volume.

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