Abstract
We have recently reported an induction coil-based system that can detect naturally emanated magnetic fields from the human body in unshielded environments. Previously, we demonstrated in simulation that, with the addition of a partial iron box shielding, the noise at the recording site can be significantly reduced. In this work, we take a step further and validate in vitro that such partial shielding can indeed effectively increase the sensitivity of our system and reduce the extent of digital signal processing (DSP) required. Indeed, in vitro experimental results show that, with partial shielding, less averaging time (24 minutes vs. 30 minutes), and a smaller number of notch filters (7 vs. 10) can retrieve a wideband (100-1000Hz), low strength (8.76 pT) bio-magnetic signal with even higher clarity level. Results shown here can expand the clinical applicability of our bio-magnetic sensing system such that higher quality signals can be detected with less extensive DSP.
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