Abstract
Thickness vibration mode is commonly used for high-frequency transducers. For disc piezoelectric ceramics, there is no ideally pure thickness vibration mode because the coupling between the radial and thickness modes always exists. Furthermore, it also deteriorates the transmission voltage response and directivity of the high-frequency transducer. In this paper, based on the theoretical calculation and finite element simulation method, a new method was proposed, and the related experiment was carried out to convince this idea. Both the simulation analysis and experimental results show that drilling a hole at the center of piezoelectric vibration is a simple but effective method to obtain a pure thickness vibration mode of the disc piezoelectric ceramic, and then improve the transmitting ability and directivity of the high-frequency piezoelectric transducer. The sidelobe level is as low as −21.3 dB.
Highlights
Thickness vibration mode is commonly used for high-frequency transducers
One-dimensional vibration theory was often used to approximate the thickness vibration of ideal piezoelectric discs, while radial coupling must be considered for finite-size piezoelectric discs [8]
The experimental results showed that the relatively pure thickness vibration mode was achievable by using the piezoelectric ceramic disc with a central hole, which provided an effective method for the design of high-frequency transducer
Summary
High-frequency transducers are widely used in underwater acoustic systems [1]. Because the working frequency of the high-frequency transducer is high, it can obtain sharp directivity, which is helpful for sonar systems to identify the type and shape of underwater fine targets. Piezoelectric transducers with piezoelectric ceramic as the functional material have higher reliability, impact resistance and long-time working stability than flexible sensors It is the mainstream device of underwater acoustic systems [2,3,4,5]. Because the resonance frequency of the thickness vibration mode is relatively high, the coupling effect is common in high-frequency transducers. The resonant frequencies of the radial and thickness vibration of the oscillator were calculated, and the influence of the coupling effect was analyzed by solving the frequency equation of the multimode coupling vibration of the finite size piezoelectric disc oscillator. The experimental results showed that the relatively pure thickness vibration mode was achievable by using the piezoelectric ceramic disc with a central hole, which provided an effective method for the design of high-frequency transducer
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