A Sensitivity-Enhanced Fiber Grating Voltage Sensor Based on Giant Magnetostrictive Material Applied for Voltage Detection

This article shows a sensitivity-enhanced fiber grating voltage sensor based on giant magnetostrictive material using the edge demodulation system of multiple coarse wavelength division multiplexers (CWDMs). We firstly verified any number of CWDMs in series within 19 can enhance the sensitivity of this proposed sensor in theory. And the experimental result of voltage detection indicates this sensitivity of the sensor by using two CWDMs randomly as the demodulation system is 1.54 times that of this sensor by using a CWDM as the demodulation system, namely, the sensitivity of the proposed sensor can indeed be enhanced by using any two CWDMs as the demodulation system. This work opens a door for the practical usage of this proposed sensor in high-voltage detection of power grids.