Sensing fiber used in reflective all-fiber current sensor

Abstract

The invention discloses a sensing fiber used in a reflective all-fiber current sensor. The sensing fiber comprises a polarization-preserving fiber, wherein the polarization-preserving fiber comprises a non-rotating section, a rotation-starting section and a uniform rotation section in turn; and a reflective film is plated at the tail end of the uniform rotation section. The sensing fiber has the characteristics of simple manufacturing and low cost.

Description

Technical field [0001] The invention relates to a sensing optical fiber in a current sensor, in particular to a sensing optical fiber in a reflective all-fiber current sensor for measuring large currents and performing relay protection in high-voltage lines. Background technique [0002] With the rapid economic development today, the capacity of long-distance transmission of power has increased dramatically. In order to reduce the loss of power transmission, increasing the transmission voltage is an effective way. At present, the current measurement and relay protection in high-voltage lines are all current transformers wound by silicon steel sheets and enameled copper wires. With the continuous increase of line voltage, this kind of current transformer has encountered great difficulties in insulation, and the quartz material used to make the optical fiber itself is a good insulator, so the current transformer made of optical fiber can theoretically be at any height It is an ide...

AI Technical Summary

Problems solved by technology

The three-stress and multi-stress spun fiber can greatly reduce the rotation speed, thereby reducing the loss of the fiber during melting and rotation, and can transmit very circularly polarized light, coupled with the aforementioned twisted fiber 1 / 4 wave plate or 45 °Welded optical fiber 1 / 4 wave plate, the two can form an ideal sensing optical fiber for optical fiber current sensors, but there are currently no commercial products available for triple-stress and multi-stress optical fibers, and they must be made by burning rods and drawing, and this kind of The preparation process of optical fiber is complicated, and it is necessary to have two large and expensive equipments: polarization maintaining optical fiber rod making machine and rotating optical fiber drawing machine

Since the amount of this sensing fiber is very small, the utilization rate of these two expensive devices is very low, resulting in a waste of resources

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