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本文介绍一种利用驻极体话筒制作的振动传感器以及相应的振动信号放大、比较、处理电路,具有灵敏度连续可调、振动信号可采样保持等较好的实用性能。一、振动传感器的制作驻极体电容话筒把声音转变为电信号的原理是因为它的振动膜片与极板间形成电容,当膜片随声波发生振动时,电容两端因膜片上的静电场发生变化而产生交变电压信号,从引出线将电信号引出。我们如果采取办法,让外界振动时,话筒膜片也发生振动,这个话筒即可把外界的振动信号转变为电信号,成为一种振动传感器。具体制作方法如下:
This paper introduces a vibration sensor using electret microphone and the corresponding vibration signal amplification, comparison, processing circuit, with sensitivity continuously adjustable, the vibration signal can be sampled and maintained, and other good practical performance. First, the production of vibration sensor Electret condenser microphone The sound into the electrical signal principle is because of its vibration between the diaphragm and the plate to form a capacitor, when the diaphragm vibrates with the sound when the capacitor on both sides of the diaphragm Changes in the electrostatic field to produce alternating voltage signal, the lead from the electrical signal leads. If we take measures to make the outside world vibrate, the microphone diaphragm also vibrates, the microphone can be the external vibration signal into electrical signals to become a vibration sensor. Specific production methods are as follows: