Abstract:
Phononic crystal structure is used in the matching layer of the transducer.The energy band characteristics of the phonon crystal and the matching performance of the transducer are combined to improve the ability of transducer.The influence of the phononic crystal structure parameters on the band width, the transmission voltage response and the radiation characteristics of the ultrasonic transducer are investigated. The equivalent circuit model of the vibration transducer with the thickness of the phonon crystal shape matching layer is established, and transmission matrix is used to calculate the transmission coefficient of acoustic energy of matched layers.The results show that reasonable material and thickness phonon crystal shape matching layer can make the transducer with broad frequency band.When the resonance frequency of the transducer is in the range of the phonon crystal structure, the acoustic energy transmission coefficient can reach to 1.
