Eddy current sensor output is proportional to the vibration displacement. Sensor contact with don't object to be tested, can measure the vibration of rotating components, and can be further used for measuring the two key parameters of rotating machinery vibration analysis: speed and phase. Vibration measuring frequency range is wide, can at the same time as a static and dynamic measurement, suitable for the vast majority of rotating machinery. Sensor output is associated with material object to be tested, the material itself will affect the sensor sensitivity and linear range, must make a new calibration. In order to obtain reliable data, more strict with the installation of the sensor.

Speed sensor output is proportional to the vibration velocity, the signal can be directly provided to analysis system. Sensor installation simple and temporary measure can use walking way or with fixed object to be tested by magnetic bridge, long-term monitoring by screw with fixed object to be tested. Speed sensor, the quality of partial volume is big, poor low frequency characteristics, measuring 10 hz, the vibration amplitude and phase error, need to compensate. When measuring generator and exciter vibration, speed sensor may be affected by electromagnetic interference. At this point, the speed sensor output signal becomes very unstable, big and small, no rules.

Acceleration sensor output is proportional to the vibration acceleration. Small volume, light quality is the outstanding characteristic of acceleration sensor, especially suitable for small and quality is lighter parts of the vibration test. Acceleration sensor structure is compact, is not easy to damage. Eddy current, speed and acceleration sensor in rotating machinery vibration test has been widely used. Usually with eddy current sensor measuring rotor vibration, bearing vibration is measured with a speed or acceleration sensor. In addition, from the relationship between the displacement, velocity and acceleration, to highlight reflect the fault signal of high frequency component or pulse quantity change, can choose acceleration sensor, but in order to reflect the fault signal, the low frequency points and changes in eddy current sensor can choose.