Non-contact measurement occupies a large proportion in the field of high-speed measurement.When measurement environment is harsh

eddy current sensor is almost the only choice.Due to the limitation of the measurement principle

the range of the eddy current sensor is proportional to its volume.The miniaturization research of sensors is more meaningful in some installation spaces where there are limitations.Aiming at the eddy current speed sensor

its sensitive coil is modeled and simulated

and a single probe with double coils structure is designed to reduce the volume of the sensor from the perspective of the probe size.At the same time

the inherent temperature drift characteristics of the coil is weakened by differential detection method and the sensor output stability is enhanced.