Development of optical fiber FBG current sensors

Abstract

The Li-Ion battery carried in electric vehicles (EV) needs to monitor electric charge and discharge accurately in each cell, in order to increase actual operating capacity of the battery without changing its physical capacity. However, conventional electrical sensors have disadvantages; for example, they are sensitive to electromagnetic noise. Because fiber Bragg grating (FBG) is an optical fiber element with a narrow-band sharp-reflection spectrum, it is well-suited for applications that deal with narrow-band optical signals in their spectra, such as various types of fiber sensors. In this study, we attempted to develop an FBG current sensor.