Research on weak Magnetoacoustic detection method based on phase locked amplifier

In the conductivity measurement of oil-water two-phase flow, it is detected that the frequency of Magnetoacoustic signal is high and reaches 1MHz, and there are many noise interference signals. Based on this problem, this paper studies the detection method of weak signal generated by oil-water two-phase flow based on Magnetoacoustic coupling, designs each module of phase-locked amplifier for this weak signal, and simulates each module with Multisim circuit simulation software. The simulation results are consistent with the design index, which verifies the rationality of parameter selection. Finally, the simulation results of the circuit in detection are given. The results show that the parameter selection is reasonable and the performance is stable.