Optical vortex mode all-fiber current sensor

Abstract

The invention relates to an optical vortex mode all-optical fiber current sensor. The sensor includes a linear polarization laser, a polarization-maintaining coupler, a polarization beam combiner, a misaligned butt-joint point, a polarization controller, an optical vortex optical fiber, an analyzer, and a CCD camera; the polarization beam combiner outputs two orthogonal linearly polarized light beams; the two orthogonal linearly polarized light beams are coupled with the optical vortex optical fiber in a misaligned manner, and at the same time, + / --order composite vortex modes are excited in the optical vortex optical fiber on the basis of polarization control; when the effect of a current magnetic field is applied onto the optical vortex optical fiber, phase difference is generated between the + / --order composite vortex modes; the output can form double-lobed light intensity distribution after passing through the analyzer; a double-lobe rotation angle can be observed through the CCD camera; the rotation angle is proportional to the phase difference; and the magnitude of applied current can be known according to the rotation angle on the basis of the Faraday magneto-optical effect.According to the optical vortex mode all-optical fiber current sensor, on the basis of a feature that the optical vortex optical fiber can maintain the stable transmission of an optical vortex mode and maintain the circular polarization state of the circular vortex mode, a new sensing optical fiber solution is provided for the development of the all-optical fiber current sensor. The optical vortex mode all-optical fiber current sensor has a high application value in the current measurement field.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to an optical vortex mode all-fiber current sensor. Background technique [0002] Traditional current sensors have been widely used in power systems. However, with the rapid growth of power demand and the continuous promotion of smart grid technology, their shortcomings are gradually revealed. For example: when the measured current suddenly increases, the iron core of the traditional mutual inductance current sensor will experience magnetic saturation, which will seriously reduce the measurement accuracy; in the ultra-high voltage environment, the insulation structure relying on oil insulation becomes more and more complicated and the cost is high , and there is a risk of explosion; susceptible to electromagnetic interference, the measurement accuracy is reduced; the equipment is bulky, difficult to transport and install. Due to its natural insulation, strong anti-interference...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing all-fiber current sensor is easily affected by linear birefringence, and propose an optical vortex mode all-fiber current sensor, which uses the optical vortex optical fiber to support the stable transmission performance of the optical vortex mode. It can maintain stable transmission of circularly polarized light, and has the advantages of simple structure of sensing fiber, good drawing consistency, excellent and reliable performance, etc.

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