principle of piezoelectric sensor to measure movement

Lead-free piezoelectric ceramics, it is also known as environmentally-friendly piezoelectric ceramics, Piezo electric disc is requiring PZT materials do not produce substances that are likely to be harmful to the environment during preparing use, or disposal, so as to avoid harm for the human health and reduce environmental pollution. However, currently used piezoelectric ceramic materials are mainly PZT-based materials, and their piezoelectric properties of piezoelectric film actuatorare greatly superior to those of other piezoelectric ceramic materials, and the electrical properties of the piezo plates transducer can be adjusted by doping modification and process control to meet various requirements. Application of piezo ceramics is among the various lead-containing piezoelectric ceramic materials currently used in industry, the content of lead oxide piezoelectric sensor circuit  accounts are more than 60% of the total mass of the materials. These materials are used in the manufacture, processing, storage, transportation, use, and waste disposal of components. The harm of piezoceramic force sensor is caused to the human body and the environment is self-evident, so the lead-free environment-friendly piezoelectric ceramic material is an important direction and hot topic for research and development in recent years. Currently, for lead-free piezoelectric materials ,The research of  ultrasonic atomizing piezoelectric has mainly gone through the research process of barium titanate-based, it is sodium barium titanate-based, strontium-type strontium, strontium-based, and tungsten-bronze-structured lead-free piezoelectric ceramics. Piezoelectric ceramics are the most promising lead-free piezoelectric materials. Although the development and research of lead-free piezoelectric ceramics have made great progress, it is necessary to make lead-free piezoelectric ceramics completely replace lead-based piezoelectric ceramics. Probably, research and development of lead-free piezoelectric ceramics will take a long way to go.