An ultrasonic transducer is an electroacoustic device operating in the ultrasonic range. Its core function is to convert between electrical and ultrasonic signals, and it is widely used in industrial inspection, medical diagnosis, underwater exploration, and other fields.
Features
Core Function: It can convert input electrical signals into ultrasonic signals for transmission (transmission function), and it can also convert received ultrasonic echoes back into electrical signals for feedback to the receiving circuit (reception function). Some transducers can perform both transmission and reception functions simultaneously, achieving bidirectional signal interaction through reflection.
Structural Composition: It typically consists of three parts: a face material (protective layer and impedance matching layer), a piezoelectric material (core functional layer), and a back material (damping layer). The piezoelectric material is key to determining the efficiency of electrical energy to acoustic energy conversion; its piezoelectric effect enables reversible conversion between electrical signals and mechanical vibrations.
Working Principle: Based on the piezoelectric effect, when a piezoelectric material is excited by an alternating electrical signal, it generates mechanical vibration and radiates ultrasonic waves; conversely, when receiving ultrasonic waves, the piezoelectric material generates electrical signals due to vibration. Transducers have a specific resonant frequency; their conversion efficiency reaches its maximum only when the frequency of the input electrical signal is close to the resonant frequency.
Common types: Based on application scenarios and functional requirements, transducers can be divided into transmitting, receiving, and integrated transceiver types. Transmitting transducers focus on efficiently converting electrical signals into ultrasonic waves, commonly used in welding, cleaning, and other scenarios requiring active ultrasonic wave emission. Receiving transducers focus on capturing weak ultrasonic echoes and converting them into electrical signals, often used in detection, ranging, and other signal receiving scenarios. Integrated transceivers integrate transmitting and receiving functions in the same device, simplifying the system structure through reflection, and are widely used in ultrasonic flow meters, level gauges, and other equipment.
Applications:
Industrial Applications: Used in ultrasonic flow meters, underwater rangefinders, level gauges, etc., to measure parameters such as fluid flow rate, distance, and level by emitting and receiving ultrasonic waves.
Medical Applications: As a core component of ultrasonic diagnostic equipment, it emits ultrasonic waves that penetrate human tissue, receives the reflected echoes, converts them into electrical signals, and processes them to form images of the internal structure of the human body for disease diagnosis. It can also be used in industrial processing scenarios such as ultrasonic welding and cleaning, achieving material bonding or surface cleaning through high-frequency vibration.
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Ultrasonic transducer 20K
Nominal frequency: 0.02 (MHz)
Adjust frequency difference: 0.001 (MHz)
Temperature frequency difference: 0.001 (MHz)
Total frequency difference: 0.002 (MHz)
Load capacitance: 13000 (pF)
Load resonance resistance: 15 (Ω)
Excitation level: 2W (mW)
Reference temperature: 38 (℃)
Insertion loss: 2 (dB)
Stopband attenuation: 2 (dB)
Input impedance: 0.2 (kΩ)
Output impedance: 0.2 (kΩ)
