Abstract
A two-dimensional (2D) magnetic field vector sensor is proposed and
experimentally demonstrated. A theoretical model is established to analyze
the physical mechanism in detail. The transmission response of the sensor
depends on the angle (
$\theta$
) between the magnetic orientation and the polarization direction
of tilted fiber Bragg grating (TFBG) and the intensity of magnetic field (
$H$
) when keeping
$\theta$
constant
and exhibits a sinuous behavior when keeping
$H$
constant. When
$-\theta_{c}<\theta<\theta_{c}$
and
$\pi-\theta_{c}<\theta<\pi+\theta_{c}$
, the transmission increases with the increment of
$H$
, while it decreases when
$\theta_{c}<\theta<\pi-\theta_{c}$
or
$\pi+\theta_{c}<\theta<2\pi-\theta_{c}$
. The resonance peak in the transmission spectrum does not shift
with the change of
$H$
within the experimental error. The experimental results are in
good agreement with our theoretical analysis. 2D magnetic field vector sensor
could be achieved by employing rotators to change the orientation of the sensor
head. Our proposed TFBG-based sensing system would find potential applications
in magnetic field vector sensing and refractive index sensing for polarized
liquids.
© 2013 IEEE
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