Electrostatic Sensing Techniques for Rotational Speed Measurement
Summary
Electrostatic sensing exploits the interaction between surface charge variations on a rotating component and a stationary electrode to deliver non-contact measurement of angular velocity. As a rotor or shaft moves, triboelectric or flow-induced charge accumulates on a deliberately applied strip or on inherent surface irregularities. Fluctuations in the induced charge generate a time-varying signal that is converted, filtered and counted to yield a frequency proportional to the rotational speed. Mathematical models quantify spatial sensitivity, filter length and signal bandwidth in relation to electrode geometry and air gap, enabling optimisation of sensor design. These robust systems are well suited to harsh environments—such as high temperature, heavy dust or limited access—and find application in industrial gearboxes, bearings, turbines and aerospace machinery where traditional encoders or optical systems face limitations.
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Electrostatic Sensing Techniques for Rotational Speed Measurement publication trend
The graph below shows the total number of articles in electrostatic sensing techniques for rotational speed measurement across all publications each year (not limited to Nature Index journals).
Technical terms
Electrostatic sensor: A non-contact device that measures variations in induced charge on a rotating surface by means of a fixed electrode.
Spatial sensitivity: The variation in sensor response as a function of the lateral position of a moving charge relative to the electrode.
M/T method: A digital counting technique in which the ratio of the number of pulses (M) to the elapsed time interval (T) is used to calculate rotational frequency.
Signal bandwidth: The range of frequencies that the sensing and signal-processing chain can faithfully transmit without significant attenuation or distortion.
References
- Digital Approach to Rotational Speed Measurement Using an Electrostatic Sensor. Sensors (2019).
- Mathematical modelling and experimental validation of electrostatic sensors for rotational speed measurement. Measurement Science and Technology (2014).
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