Piezoelectric ultrasonic generator

Piezoelectric ultrasonic generator actually using piezoelectric crystal resonators to work, the ultrasonic generator internal structure shown in Figure 2.1, it has two piezoelectric wafers and a sounding board when it is applied bipolar pulse signal, its frequency is equal to the natural oscillation frequency of the piezoelectric wafer, the wafer will piezoelectric resonance, and resonance driving plate vibration, will produce ultrasound. Conversely, if no voltage is applied between the two electrodes, when the board receives the ultrasonic resonance, the vibration suppression of piezoelectric wafer as the mechanical energy into electrical signals, then it becomes an ultrasonic sensor.
Piezoelectric ceramic wafer has a fixed resonant frequency, i.e., the center frequency f0. When the ultrasonic waves, plus thereon frequency alternating voltage to be consistent with its natural resonant frequency. Thus, ultrasonic sensors have high sensitivity. When the piezoelectric material constant, changing the geometry of the piezoelectric ceramic chip, it can very easily change its natural resonant frequency. With this feature it can be made of various frequencies of ultrasonic sensors.
The internal structure of the ultrasonic sensors from piezoelectric ceramic wafer radiation cone speakers, base, lead, metal shell and metal mesh, wherein the piezoelectric ceramic chip is the core of the sensor, so that the speaker cone radiation transmitting and receiving ultrasonic energy concentration, and there is a certain point angle sensor, a metal shell outside forces to prevent damage to the piezoelectric ceramic chip and radiation cone speakers. Metal mesh also play a protective role, but does not affect the transmission and reception of ultrasonic waves.

結果 (中文) 1:

压电超声波发生器实际上使用压电晶体谐振器工作，超声波发生器内部结构如图 2.1，它有两个压电晶片和探测板时它应用双极脉冲信号，其频率等于压电晶片的固有振荡频率，晶圆将压电谐振和驱动板共振，会产生超声波。相反，如果没有电压之间的两个电极，当董事会收到超声共振的振动抑制的压电晶片作为机械能转化为电信号，它就成为超声波传感器。压电陶瓷晶片具有固定的谐振频率，即，中心频率 f0。当超声波，再加上此频率交流电压必须与它的固有谐振频率一致。因此，超声波传感器，具有灵敏度高。当压电材料恒定，改变几何形状的压电陶瓷芯片，它可以非常容易地更改它的固有谐振频率。使用此功能可以由许多不同频率的超声波传感器。从压电陶瓷超声波传感器的内部结构硅片辐射纸盆喇叭、 基地、 铅、 金属外壳和金属网，其中的压电陶瓷芯片是核心的传感器，因此扬声器锥辐射的发射和接收超声波能量集中，而且还有某些点角度传感器，外部力量，以防止损坏压电陶瓷芯片和辐射纸盆喇叭的金属外壳。金属网片也起着保护作用，但并不影响发射和接收超声波。

結果 (中文) 3:

压电超声发生器实际上是利用压电晶体谐振器来工作，超声波发生器内部结构如图2.1所示，它具有双压电晶片和一个探测板时所适用的双极性脉冲信号，其频率等于压电晶片的固有振动频率，晶片将压电共振，共振驱动板振动，会产生超声波。相反，如果在两根电极之间没有电压，当板接收到超声波共振时，将压电晶片的振动抑制作为机械能转换为电信号，然后变成一个超声波传感器。压电陶瓷晶片有一个固定的谐振频率，即中心频率f0。当超声波，再加上其频率的交流电压是符合其固有的共振频率。因此，超声波传感器具有很高的灵敏度。当压电材料常数，改变压电陶瓷片的几何形状时，它可以很容易地改变其固有频率。有了这个功能，它可以由各种频率的超声波传感器。超声波传感器的内部结构由压电陶瓷片辐射锥喇叭、底座、引线、金属外壳和金属网组成，其中压电陶瓷芯片是传感器的核心，使扬声器锥辐射发射和接收超声波能量集中，并有一定的角度传感器，金属外壳的外力，以防止损坏的压电陶瓷芯片和辐射锥扬声器。金属网也起到保护作用，但不影响超声波的传输和接收。