Ultrasonic transducers have a wide range of applications and many types of models. The materials for transducers are mainly piezoelectric ceramics, single crystals, composite materials and magnetostrictive materials. Among them, piezoelectric ceramics are used more. Here is a brief introduction Classification of piezoelectric ultrasonic transducers:
1. According to the sound wave propagation medium in the working process of the transducer
A. Air-medium transducer: Use gas as the propagation medium of sound waves, such as air ranging and gas flow transducers;
B. Liquid-medium transducer: liquid is used as the propagation medium of sound waves, such as underwater ranging and liquid flow transducers;
C. Solid-medium transducer: solid as the propagation medium of sound waves, such as non-destructive testing transducers basically belong to this category.
2. According to the role played by the transducer in the working process
A. Transmitting transducer: The transducer is only used to transmit sound waves (signals);
B. Receiving transducer: The transducer is only used to receive sound waves (signals);
C. Transceiver shared transducer: The transducer is used for both transmitting and receiving sound waves (signals);
3. According to the vibration mode of the transducer
A. Sandwich/longitudinal vibrator transducer: According to a certain structure, the mechanical components and piezoelectric ceramics are combined by prestressing, such as ultrasonic cleaning and welding transducers generally belong to this type;
B. Flexural vibration (laminated) transducer: Transmit and receive sound waves (signals) in a flexural vibration mode. For example, the transducer used on the reversing radar belongs to this type;
C. Ordinary/conventional transducers: only piezoelectric ceramics are used alone, using its own various vibration modes, and fixed and sealed in the shell by adhesives. This type of transducer is commonly used in non-destructive testing transducers. Belong to this type;
D. Other vibration mode transducers: such as flextensional type, cymbal type, etc., but there are few applications and will not be listed here;
4. According to the bandwidth of the transducer: there are broadband and narrowband transducers, which are more used for underwater acoustics
5. According to the temperature resistance of the transducer: ordinary, medium temperature and high temperature transducers;
6. According to the pressure resistance of the transducer: ordinary and high-pressure transducers;
7. According to the frequency of the transducer: low frequency, intermediate frequency and high frequency transducer;
There are many types of transducers, and some of the types are listed above for reference only.
