Differences between piezoelectric and eddy current sensors
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I would like to ask the experts: what are the differences between piezoelectric and eddy current sensors? What are their respective features, and what are the similarities and differences in their areas of application?
Eddy current sensors operate on the principle of induced eddy currents. When a coil carrying a high-frequency current is brought close to the metal being tested, the high-frequency electromagnetic field generated by this current induces an electric current on the surface of the metal; this phenomenon is known in electromagnetism as eddy currents. The eddy current effect is related to parameters such as the distance between the eddy current effect and the metal being measured, as well as its conductivity, permeability, geometric dimensions, and current frequency. An eddy current sensor operates by measuring parameters such as the displacement and vibration of metal objects. A piezoelectric sensor is a typical self-generating sensor. It operates on the basis of the piezoelectric effect of certain dielectrics (such as quartz crystals or piezoelectric ceramics, polymer materials). Piezoelectric sensors are primarily used in the measurement of acceleration, pressure, force, and other quantities