A piezoelectric sensor is a typical what?

Sensor device. Sensors are devices that convert measured physical quantities into electrical signals, and they are capable of converting a wide variety of physical quantities, such as mechanical, optical, and thermal, into electrical output signals. Piezoelectric sensors are sensors that convert mechanical signals such as pressure and stress into electrical signals, and they work by utilizing the piezoelectric effect. The piezoelectric effect refers to the phenomenon that certain crystals generate an electric charge when subjected to a force, thereby producing a voltage. Piezoelectric sensors are usually composed of a piezoelectric sheet and electrodes. When acted upon by an external force, the piezoelectric sheet generates an electric charge, which in turn generates a voltage signal output between the electrodes. Piezoelectric sensors are widely used in machinery, instrumentation, aerospace, medical devices and other fields, and have the advantages of high sensitivity, fast response speed and good stability.