Miniaturized optical fiber current sensor and information processing system

Abstract

The invention relates to the technical field of current detection in a high-voltage power transmission line, and provides a miniaturized optical fiber current sensor and an information processing system. The miniaturized optical fiber current sensor comprises a semiconductor laser, a magneto-optical medium and a detector, the information processing system comprises a demodulator and a data analysis display terminal, and the miniaturized optical fiber current sensor clings to a wire to be measured for measurement; when the current on the lead to be measured is measured, semiconductor laser emits laser, laser light passes through magneto-optical medium and is transmitted to the detector through the optical fiber, the detector converts the optical signals into electric signals, the electric signals are inputted into the demodulator, the magnetic field intensity B is calculated through the magneto-optical effect and the Malus theorem, the current intensity I of the to-be-measured wire is calculated according to the Pitot-Savart theorem and the magnetic field intensity B and is displayed through the data analysis display terminal. The technical problems that a current detection method in the prior art is large in size, heavy in weight and prone to being interfered by exciting current are solved.

Description

technical field [0001] The invention relates to the technical field of current detection in high-voltage transmission lines, in particular to a miniaturized optical fiber current sensor and an information processing system, which uses optical fiber sensing technology and signal processing technology to quickly detect the current in the wire, and is suitable for real-time monitoring of current in high-voltage transmission lines. detection. Background technique [0002] Current detection methods commonly used in the prior art are as follows: [0003] Shunt: The principle of the shunt is simple, and it is usually used in low-frequency and small-amplitude current measurement, but when it is applied to high-frequency and large-value current measurement, a large error will occur. [0004] AC current transformer: AC current transformer has a simple sensing principle and high precision. However, AC current transformers are only suitable for AC current measurement within thousands ...

AI Technical Summary

Problems solved by technology

[0008] In view of the above problems, the object of the present invention is to provide a miniaturized optical fiber current sensor and information processing system, which utilizes the characteristics that the optical fiber or waveguide itself can eliminate the influence of the excitation current, and adopts an ultra-short length magneto-optical sensor with an input polarizer and an output polarizer. Optical fiber or magneto-optical waveguide, using the inherent characteristics of optical fiber or waveguide to eliminate external electromagnetic interference, achieve the purpose of reducing cost and volume, and the miniaturized current sensor of the present invention is closely attached to the power transmission wire for measurement, and can be integrated into a super The small sensor is hung on the transmission line. Compared with other distance sensors, the measurement sensitivity is higher, and it can be made smaller. At the same time, it also avoids that when the distance sensor is used for measurement, the measurement position is easy to change, resulting in Unstable and inaccurate measurement results occur

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