광섬유 브래그 격자 센서를 이용한 전기 전류량 모니터링

In this paper, the amount of electric current is measured using a fiber optic sensor. Because fiber optic sensors are insensitive to electromagnetic forces, it is very difficult to directly measure the magnitude of the current flowing through an electrical wire. Therefore, the magnitude of the current should be measured indirectly and the electromagnet was used in this study. That is, the magnitude of the induced magnetic force changes according to the magnitude of the current applied to the electromagnet. If the magnitude of the magnetic force can be measured, the magnitude of the current can be indirectly measured. Therefore, we have to design a device that responds to magnetic force. In this paper, we tried to measure the magnetic force by placing the electromagnet at the tip of a simple cantilever beam with magnetism and increasing the bending load of the cantilever according to the magnitude of the magnetic force induced in the electromagnet. In addition, the strain of the cantilever root end caused by the bending load was measured using a fiber Bragg grating sensor, and the correlation between the measured strain and the magnitude of the current applied to the electromagnet was found through experiments. Finally, it was confirmed that the magnitude of the current applied to the electromagnet can be measured by measuring the strain at the end of the cantilever support using the relational equation.