Abstract: Two simple techniques for the compensation of the temperature effects in fiber Bragg grating (FBG) based magnetostrictive sensors are demonstrated, where two FBGs are arranged in such a way that the magnetostrictive effects on the two gratings are added together, while the temperature effects are cancelled out. The two FBGs can be bonded in perpendicular to each other onto the surface of a magnetostrictive plate, or onto the surface of two different magnetostrictive bars that possess close thermal expansion coefficients but magnetostrictive coefficients of opposite signs. In both cases, the Bragg wavelength difference between the two gratings is insensitive to the temperature and measures the sum of the magnetostrictive effects experienced by the two FBGs. Using these techniques, we have been able to reduce the temperature sensitivity of the sensor by more than 10 times. !10
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