New Transducer Material---Piezoelectric Ceramics

               New Transducer Material---Piezoelectric Ceramics

Piezoelectric Transducer

The main working principle of the piezoelectric ceramic transducer is the positive piezoelectric effect. After the external force is applied, the generated charge can only be preserved when the circuit has an infinite input impedance, but in fact there will be no such situation, so the piezoelectric ceramic sensor can only be used to measure and sense dynamic or quasi-static stresses. It is mainly used for the measurement of various physical quantities such as acceleration, pressure and vibration and their changes. Piezoelectric ceramic sensors have been widely used as key components of various control systems and testing instruments.

The main working principle of the piezoelectric ceramic sensor is the positive piezoelectric effect. After the external force is applied, the generated charge can only be preserved when the circuit has an infinite input impedance, but in fact there will be no such situation, so the piezoelectric ceramic sensor can only be used to measure and sense dynamic or quasi-static stresses. It is mainly used for the measurement of various physical quantities such as acceleration, pressure and vibration and their changes. Piezoelectric ceramic sensors have been widely used as key components of various control systems and testing instruments.

Analysis of Piezoelectric Ceramics

Piezoelectric ceramics are a class of electronic ceramic materials with piezoelectric properties. The main difference from typical piezoelectric quartz crystals that do not contain ferroelectric components is that the crystal phases that constitute its main components are all ferroelectric crystal grains. Since ceramics are polycrystalline aggregates with randomly oriented grains, the spontaneous polarization vector of each ferroelectric grain is also chaotically oriented. In order for ceramics to exhibit macroscopic piezoelectric properties, it must be And after the end face is re-electroded, it is placed under a strong DC electric field for polarization treatment, so that the original polarization vectors of the original chaotic orientation are preferentially oriented along the direction of the electric field. The piezoelectric ceramics after polarization treatment, in the electric field After cancellation, a certain macroscopic remanent polarization strength will be retained, so that the piezoceramics has certain piezoelectric properties.

The field of application of piezoelectric ceramic sensor

Piezoelectric ceramic acceleration sensor is a commonly used accelerometer. It has the advantages of small size, simple structure, light weight and long service life. It is widely used in vibration and shock measurement of aircraft, automobiles, ships, bridges and buildings, especially Especially in the field of aviation and aerospace, piezoelectric ceramic acceleration sensors have their unique status. Piezoelectric ceramic sensors play an important role in the measurement of combustion pressure, vacuum, and knock caused by mismatching ignition angles inside automotive engines. In the military industry, piezoelectric ceramic sensors are used to measure the change of the chamber pressure and the muzzle shock wave pressure when the bullet is fired, which can measure both large pressure and small pressure. So far, the application of piezoelectric ceramic sensors ranges from the development of the universe to family life. my country's research on piezoelectric ultrasonic  sensors began in the late 1950s, about 10 years later than abroad. At present, it has considerable strength in the trial production and industrial production of piezoelectric ceramics, and many materials have reached or approached international standards level.