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A Fiber-Bragg-grating-based sensor for simultaneous AC current and temperature measurement

Reilly, Deborah and Willshire, Andrew James and Fusiek, Grzegorz and Niewczas, Pawel and Mcdonald, James (2006) A Fiber-Bragg-grating-based sensor for simultaneous AC current and temperature measurement. IEEE Sensors Journal, 6 (6). pp. 1539-1542. ISSN 1530-437X

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In this paper, a sensor that is capable of measuring both ac current and temperature using a single fiber Bragg grating (FBG) is described. The device consists of a magnetically biased magnetostrictive alloy bonded to an FBG. The magnetic field generated by the current in a specially designed coil produces internal strains in the magnetostrictive alloy which can be detected by the FBG. The temperature at the sensing point is determined through averaging of the sensor output signal. The measurement range of the sensor can be varied by altering the design of the sensor coil. A prototype sensor that is capable of measuring ac currents up to 1 A has been constructed while simultaneously measuring temperatures of up to 100 degC