Multi-light-path reflecting optical fiber current sensor

Abstract

The invention discloses a multi-light-path reflecting optical fiber current sensor, which comprises a light source, a polarizer, an optical fiber coupler, a transmission optical fiber, a single solenoid, a sensing head, a first self-focusing lens, a second self-focusing lens, a third self-focusing lens, an analyzer and two optical detectors, wherein the light source is arranged in front of the polarizer; the optical fiber coupler is arranged behind the polarizer and connected with an input end of the single solenoid through the transmission optical fiber and the first self-focusing lens in sequence; an output end of the single solenoid is connected with the second self-focusing lens, the transmission optical fiber and the third self-focusing lens in sequence; the analyzer is arranged in front of the third self-focusing lens; and the two optical detectors are arranged in front of the analyzer. The sensitivity of the multi-light-path reflecting optical fiber current sensor is higher than that of a linear optical fiber current sensor by about 500 times, the multi-light-path reflecting optical fiber current sensor is simple in structure, and system sensitivity can be flexibly regulated by adjusting the quantity of optical channels in glass.

Description

Technical field: [0001] The invention belongs to the field of optoelectronics, and relates to an optical fiber current sensor, in particular a multi-optical path reflection type optical fiber current sensor. Background technique: [0002] At present, the current transformer widely used in the power system is an electromagnetic current transformer. Its sensing head adopts the principle of electromagnetic induction. Under different voltage levels, the current from a few amperes to several thousand amperes on the primary side is converted to zero potential. Several amperes of current on the secondary side in the state, for metering, control and monitoring instruments. The structure of the electromagnetic current transformer is simple, so it has high reliability and is not easy to be damaged. This is its main advantage and the main reason for its widespread use. However, due to the particularity of the structure and use conditions, it also has the following outstanding shortcomings:...

AI Technical Summary

Problems solved by technology

The disadvantage is that when measuring small signals, the magnetic field around the conductor is small, and the Faraday rotation angle is small; the bending loss and bending birefringence effect of the optical fiber are large

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