Eddy current sensor

The utility model provides an eddy current sensor, which is used for solving the crosstalk problem when a plurality of sensors work simultaneously and improving the accuracy of the eddy current sensor. The eddy current sensor comprises a signal generation circuit and a detection circuit. The signal generation circuit comprises a microcontroller, a voltage-controlled band-pass filter and a power amplifier; wherein the voltage-controlled band-pass filter comprises a band-pass filter and a voltage-controlled gain amplifier which forms a feedback loop between an output port and an input port of the band-pass filter; the input end and the output end of the band-pass filter are connected to the input end of the microcontroller and the input end of the voltage-controlled gain amplifier respectively. The output end of the voltage-controlled gain amplifier is connected to the input end of the band-pass filter after passing through an operational amplifier; and the input end and the output end of the power amplifier ar