Simultaneous AC and DC measurement based on an FBG-magnetostrictivefiber sensor
2021
Simultaneous alternating current (AC) and direct current (DC)
measurement is demonstrated with a new fiber sensor that combines fiber
Bragg gratings (FBGs) with giant magnetostrictive materials (GMMs).
Deformation of GMMs, proportional to the central wavelength shift of FBGs,
is different when applying DC and AC to a solenoid where the whole sensing
structure is located. DC introduces a constant deformation while AC causes
a periodic variation. Therefore, the central wavelength of FBG has a
periodic harmonic variation, which makes it possible to demodulate the
values of DC and AC at the same time. In addition, the proposed method has
potential significance for reducing temperature cross talk caused by the
thermal sensitivity of FBGs. The experimental results show that the
sensitivity of the AC current can reach up to 0.090576 nm/A in the range
of 0 to 1 A, and in different AC environments, the sensitivity of the DC
current can reach up to 0.2378 nm/A.
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