High temperature superconductor (HTS) thin films have been applied in making a
low loss RF receiver coil for improving magnetic resonance imaging image
quality. However, the application of these coils is severely limited by their
limited field of view (FOV). Stringent fabrication environment requirements and
high cost are further limitations. In this paper, we propose a simpler method
for designing and fabricating HTS coils. Using industrial silver alloy sheathed
Bi(2−x)PbxSr2Ca2Cu3O10 (Bi-2223) HTS tapes, a five-inch single-turn HTS solenoid coil has been developed, and
human wrist images have been acquired with this coil. The HTS tape coil has
demonstrated an enhanced FOV over a six-inch YBCO thin film surface coil at 77 K with
comparable signal-to-noise ratio.
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 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.
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