Gradiometer resembles in functionality a sensor measuring the magnetic field gradient whose sensitivity is determined the ability to quantify change with respect to base value. Magnetoelectric (ME) gradiometer designed in this study utilizes ME composites with ring-dot piezoelectric transformer structure working near electromechanical resonance, where ring acts as the input while dot acts as the output. Magnetostrictive disc was bonded on top of the output section resembling a bilayer composite structure. The resonance frequency of sample was found to be in the range of 91-94 kHz. The generated magnetic field due to converse ME effect interacts with the externally applied magnetic field producing flux gradient which is detected through the frequency shift and output voltage change of gradiometer. The measurements clearly illustrate that the proposed design has high sensitivity and it can be used for detecting magnetic field gradient.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics