Application of piezoelectric ceramics

Main purpose:

1. Sound converter: sound converter is one of the most common applications. Like pickup, microphone, earphone, buzzer, ultrasonic depth detector, sonar and ultrasonic flaw detector of materials, piezoelectric ceramics can be used as sound converter. For example, the buzzer on children's toys is that the current vibrates through the inverse piezoelectric effect of piezoelectric ceramics and makes a sound that can be heard by human ears. Piezoelectric ceramics can produce different frequencies of vibration through the control of electronic circuits, so as to produce a variety of different sounds. For example, electronic music greeting cards convert AC audio electrical signals into sound signals through inverse piezoelectric effect.

2. Piezoelectric detonator: since the British invented the tank in the first World War and used it in the battle of Somme River in France for the first time, which hit the German army hard, the tank showed its skill in many battles. However, in the 1960s and 1970s, due to the invention of anti tank weapons, tanks lost their former glory. When the armor piercing projectile fired by the anti tank gun contacts the tank, it will immediately explode and shatter the tank. This is because the warhead is equipped with piezoelectric ceramics, which can convert the strong mechanical force during collision into instantaneous high voltage, spark and detonate explosives.

3. A new type of electronic lighter used on the gas stove of piezoelectric lighter is made of piezoelectric ceramics. As long as you press the ignition button with your finger, the piezoelectric ceramics on the lighter can produce high voltage, form an electric spark and ignite the gas, which can be used for a long time. Therefore, the piezoelectric lighter is not only convenient to use, safe and reliable, but also has a long service life. For example, a lighter made of titanium lead acid piezoelectric ceramics can be used more than 1 million times.

4. Anti nuclear goggles after the nuclear tester wears goggles made of transparent piezoelectric ceramics, when the light radiation generated by nuclear explosion reaches the dangerous level, the piezoelectric ceramics in the goggles will convert it into instantaneous high voltage. In 1 / 1000 s, the light intensity can be reduced to only 1 / 10000. When the dangerous light disappears, it can return to the original state. The goggles are simple in structure and weigh only tens of grams. They are installed on the anti nuclear goggle helmet and are very convenient to carry.

5. Ultrasonic transducer is suitable for ultrasonic welding equipment and ultrasonic cleaning equipment. It is mainly made of high-power transmitting piezoelectric ceramics. Ultrasonic transducer is a device that can convert high-frequency electric energy into mechanical energy. Ultrasonic transducer is used as energy converter, Its function is to convert the input electrical power into mechanical power (i.e. ultrasonic) and then transmit it, and it consumes a small part of power itself.

6. Sonar is the most difficult thing to deal with in naval warfare. It can dive under the sea for a long time and sneak attack ports and ships unknowingly, which makes the enemy a big headache. How to find enemy submarines? We can't rely on our eyes, nor can we use radar, because electromagnetic waves will decay rapidly in sea water and can't transmit signals effectively. Detecting submarines depends on sonar - Underwater ears. Piezoelectric ceramics are the materials used to make sonar. They send out ultrasonic waves and reflect back when they encounter submarines. After being received and processed, they can measure the orientation and distance of enemy submarines.