Novel non-intrusive all-fiber reciprocity type voltage electric field sensor

Abstract

The invention discloses a novel non-intrusive all-fiber reciprocity type voltage electric field sensor. The optical path system comprises a light source, a polarization-maintaining coupler A, a Y waveguide, a polarization-maintaining coupler B, a polarization-maintaining delay optical fiber, a 45-degree optical rotation mirror, a collimator, a lithium niobate waveguide and a reflector, which are sequentially connected through optical fibers. The Pockels effect of the lithium niobate waveguide is utilized to achieve sensitivity to a measured voltage electric field. In the optical path, polarization maintaining optical fiber is used for connection before the 45-degree optical rotation mirror, and then low-polarization optical fiber is used for connection, so that it is guaranteed that two pieces of orthogonal linearly polarized light participating in interference pass through the same optical path in the optical path, and reciprocity of the optical path is achieved. The all-fiber reciprocity type sensitive optical path does not need equal length of two sections of optical fibers, so that the requirement of the system on the process is reduced; the reciprocity ensures the measurementprecision and stability of the system; and the environmental adaptability and the anti-interference capability of the system are improved through all-fiber connection. According to the invention, thesensing head is integrally packaged by using an integrated optical process technology, so that the practicability of the sensor is improved.

Description

technical field [0001] The invention belongs to the technical field of optical voltage and electric field sensing, and in particular relates to a novel non-invasive all-fiber reciprocal voltage and electric field sensor based on the Pockels effect. Background technique [0002] The new-generation power system based on power energy flow and big data intelligent information flow has been comprehensively promoted in various fields such as global energy, transportation, industry, and military, and has led to technological changes in various fields of human beings. In electrical systems in various fields, voltage and electric field measurement are important components of system electrical parameter measurement, and their fast, accurate and reliable measurement directly affects the stable and reliable operation of various electrical systems. Therefore, the measurement technology of voltage and electric field And measuring equipment has also become the key technical support and cor...

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Problems solved by technology

[0009] The technical problem solved by the present invention is: in view of the existing optical voltage electric field sensor with complex optical path structure, poor stability, poor environmental adaptability and anti-interference ability, and unsuitable for engineering applications, based on the Pockels effect using lithium niobate waveguide, A new type of non-intrusive all-fiber reciprocal voltage electric field sensor is proposed, which improves the measurement accuracy, stability, environmental adaptability and anti-interference ability, and lays a solid foundation for promoting the engineering application of optical voltage electric field sensors in power systems in various fields Base

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