压电体有什么用途?What applications do you know for piezoelectric materials?
压电体有什么用途?What applications do you know for piezoelectric materials?
发布时间：2025-02-17 17:35:12
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答案：答:压电性是指对材料施加压力,导致极化发生改变,从而在样品两侧产生小电压的现象,相应的材料称为压电体。1)压电体可以把应力转换为容易测量的电压值,可用于制造压力传感器。2)对压电体两侧施加电压,可引起其尺寸的变化,这种现象成为电致伸缩(又叫逆压电效应)。如果对压电薄膜施加交变电流,则薄膜产生振动而发出声音,利用这种现象可制作音频发声器件,如扬声器、耳机、蜂鸣器。Answer: Piezoelectric property means to produce small voltage at both sides of the material when exert pressure on the sample which leading to polarization changes. The corresponding material are named as piezoelectric material. 1) Piezoelectric material can change stress to easily measured voltage value, so it can be used to produce pressure sensors. 2) Exert an electrical voltage on both sides of the piezoelectric film can cause size changes, this phenomenon is called electrostriction (also known as the inverse piezoelectric effect). If an alternating current is applied to the piezoelectric film, the film will vibrate and sound, so it can be used to produce audio sound device, such as speakers, headphones, and buzzer.
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