18MM Car Parking r Parktronic Re Probe Black Red Blue Grey Sier Gold Aparcami for Vehicles Backup

List price is for 1 r

r knowledge: (for learning only)In order to study and waves, many s have been designed and made. rs, rs, hair rs can be divided into two categories1: The first type is to generate waves electrically,2: waves are generated mechanicallyAt present, the piezoelectric is more commonly d. It has two piezoelectric wafers and a resonance plate. When the signal is applied at its two poles and its frequency is equal to the natural oscillation frequency of the piezoelectric wafer, the piezoelectric wafer will resonate and drive the resonance plate to to produce wave. On the conry, if no voltage is applied between the two electrodes, when the resonance plate receives wave, The piezoelectric wafer will be compreed for vibration and the mechanical energy will be converted into electrical signals. At this time, it will become an r ranging: the r sends out an signal at a certain time, reflects it back when it meets the measured object, and is received by the . As long as the time from nsmitting to receiving the echo signal of the signal is calculated, and the propagation speed in the medium is known, the distance from the measured object can be calculated: