Medical device with EMI detection and cancellation

摘要: A Doppler flowmeter, which is capable of distinguishing reflected signals from spurious electrical interference signals, provided with a multi-frequency transmitter, adapted to be coupled conduit through liquid constituents may flow, for transmitting first transmitted signal at frequency into the during period time and second time, being substantially different than frequency. The flowmeter includes receiver receiving including received having third fourth Fourier transform generates difference based upon between frequencies frequencies. means determining whether differs generating flow only have equal transmission difference.