Design of Induction Magnetometer Receiving Sensor for Through-the-Earth Communications

A narrowband, high sensitivity, and low-power consumption induction magnetometer (IM) receiving sensor is designed, built, and tested for through-the-Earth (TTE) communications in this paper. The optimization method is described mathematically and applied for building an IM (central frequency 3180 Hz and 3-dB bandwidth 200 Hz). In this paper, we move the resonant frequency of the coils to the central frequency and optimize the parameters of the IM to minimize the equivalent input magnetic noise level to 7 fT/√Hz within 3-dB bandwidth. The IM dimensions are Φ 40 mm × 350 mm and the power consumption is <;4.2 mW. The feathers of the IM make it a portable receiving sensor for TTE communications.