Eddy current sensors can statically and dynamically measure the distance between the measured metal conductor and the probe surface in a non-contact, high linearity, and high-resolution manner. It is a non-contact linearization measurement tool. Eddy current sensors can accurately measure the static and dynamic relative displacement changes between the measured object (which must be a metal conductor) and the probe end face. In the state analysis, vibration research, and analysis measurement of high-speed rotating machinery and reciprocating motion machinery, multiple parameters of rotor vibration state can be continuously and accurately collected for non-contact high-precision vibration and displacement signals. Such as radial vibration, amplitude, and axial position of the shaft. Eddy current sensors are widely used in online monitoring and fault diagnosis of large rotating machinery due to their long-term reliability, wide measurement range, high sensitivity, and high resolution.