Hardware Design for Detecting Blood Flow Based on Electromagnetic Induction

In the medical field, early measurement of blood flow velocity is of great significance for early diagnosis of vascular diseases such as arterial stenosis. This paper mainly studies and designs electromagnetic flowmeter based on electromagnetic induction principle to measure blood flow. Treat applying uniform magnetic field, current body with multi electrode sensor to collect small channel induction electromotive force, and from common mode rejection ratio, the input impedance and gain of hardware circuit of signal collection has carried on the detailed design and simulation, the results show that the circuit has high common mode rejection ratio, at the same time can suppress low frequency measurement in the common noise (50/60 Hz), and the phase lag problem of filter are discussed.