Single-polarization type annular all-fiber current sensor and detection method thereof

Abstract

The invention relates to a single-polarization type annular all-fiber current sensor and a detection method thereof. The sensor comprises a light source, a first single polarization coupler, a second single polarization coupler, a first sensing fiber ring, a second sensing fiber ring and a photoelectric detector; one port in the double-port side of the first single polarization coupler is connected with the light source via a fiber, the single-port side of the first single polarization coupler is connected with the single-port side of the second single polarization coupler, one port of the double-port side of the second single polarization coupler is connected to the other port of the double-port side of the first single polarization coupler via the first and second sensing fiber rings successively, and the other port of the double-port side of the second single polarization coupler is connected with the photoelectric detector via a fiber; and both the first and second sensing fiber rings are wound around the same electrified conductor, and a winding structure of the first sensing fiber ring and a winding structure of the second sensing fiber ring are in mirror symmetry. The sensor is simple in structure, includes fewer devices, has high resistance to external interference, and has low requirements for the stability of the light source and connection devices.

Description

technical field [0001] The invention relates to the design field of optical fiber current sensors, in particular to a single polarization ring full optical fiber current sensor and a detection method thereof. Background technique [0002] With the increase of the installed capacity of the power grid, the possible harm caused by the overcurrent of the power grid is becoming more and more serious, and the importance of the current sensor is becoming more and more obvious. Due to the shortcomings of magnetic saturation, large volume, high weight, poor electrical insulation, and low safety, traditional magnetoelectric sensors have gradually been unable to meet the needs of the development of smart grids. It is urgent to find a new type of current sensor as a substitute. [0003] Fiber optic current sensor is a kind of optical current sensor, which has the advantages of relatively simple structure, light weight, good electromagnetic insulation, and high safety. Its development ca...

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Problems solved by technology

[0010] Although the above methods can solve the current sensitivity to a certain extent, there are still some problems: increasing the length of the optical fiber will increase the volume of the sensing head, and also increase the influence of external interference; the use of doped special optical fibers is not only difficult to manufacture, but also high in cost , there are still problems in temperature stability; using a circular optical path requires the use of multiple connecting devices including couplers, the structure is complex and the connecting devices are also susceptible to external influences

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