(Color online) A schematic diagram (not drawn to scale) showing the angular positions of the Hall effect sensors relative to the stress axis. The numerals denote the individual sensors. The angular separation between two adjacent sensors is 22.5°. The dark ring represents the Mu-metal shield surrounding the ferrite core.
(Color online) Time-domain field signals measured (a) along (by sensor 1 in Fig. 1(b) perpendicular (sensor 5) to the stress axis for stress levels of 0 MPa and 146 MPa.
(Color online) Angular dependence of the (a) first-order, and (b) third-order harmonic amplitudes of the field signals measured under different applied tensile stresses. The numerical data labels denote the individual sensors in the array (Fig. 1).
(Color online) Stress dependence of the measured and modeled field signal ratios at the first- and third-order harmonic frequencies. The dotted lines represent linear fits to the measured field signal ratios under tensile stresses up to 146 MPa and 135 MPa for the first- and third-order harmonics, respectively.
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