Piezoelectric ceramic is a kind of electroacoustic device with simple structure and light weight. It has been widely used because of its high sensitivity, no magnetic field dispersion and overflow, no copper wire and magnet, low cost, less power consumption, convenient repair, convenient mass production and other advantages. It is suitable for the transmission and reception of ultrasonic waves and infrasound waves. Large area piezo ceramic can also use the detection of pressure and vibration. The working principle is to use the reversibility of piezoelectric effect to apply audio voltage on them to generate mechanical vibration and sound. If the pressure is constantly applied to the piezoelectric ceramic chip, it will also generate voltage and current.

The quality test method is as follows:
The first method: turn the range switch of the multimeter to the DC voltage 2.5V gear, gently hold both sides of the piezoelectric ceramic sheet with the thumb and forefinger of the left hand, hold the multimeter probe with the right hand, connect the red probe to the metal sheet, place the black probe horizontally on the ceramic surface, then press the left hand with a little force, and then loosen it, so that two voltage signals with opposite polarity are generated on the piezoelectric ceramic sheet , so that the pointer of the multimeter swings to the right first, and then returns to zero, Then swing to the left, and the swing is about 0.1-0.15V. The larger the swing, the higher the sensitivity. If the pointer of the multimeter is still, it indicates internal leakage or damage.

Remember not to pinch the piezo disc with wet hands. During the test, the multimeter cannot use the AC voltage gear, otherwise the pointer cannot be observed, and it is better to use R before the test × The insulation resistance of 10k gear shall be infinite.

The second method: use R × Measure the two pole resistance at 10k gear, which should be ∞ under normal conditions, and then gently tap the ceramic sheet, and the pointer should swing slightly.

FBelec is mainly engaged in piezoelectric ceramic components , with a production capacity of 3.5 million pieces/year. After more than 20 years of piezoelectric ceramic proprietary technology precipitation, it has more than 30 functional material formulas and thousands of varieties of product systems to meet the differentiated needs of users, and occupies a leading position in the field of domestic piezoelectric ceramics in terms of technology, product quality and product serialization. Every year, it provides high-quality products and services for dozens of industries in China, such as underwater acoustic, electroacoustic, ultrasonic, metering, communication, detection, automatic control, medical treatment, ignition and detonation. Some products are exported abroad.

The company has built a municipal piezoelectric ceramics and device engineering laboratory. The "Co Al Co doped Barium Titanate Piezoelectric Ceramics Research" and "High Curie Temperature and High Stability Niobium Antimony Zirconium Lead Titanate Piezoelectric Ceramics Research" independently developed by the company have passed the appraisal of Ningbo's scientific and technological achievements, filling the domestic gap and reaching the international advanced level.