ring transducer
环形换能器阵列 circular transducer array
环形堆放换能器 ring stack transducer
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引入负声源，导出了凹球面状环形换能器声场的简洁表示式。
A brief expression of sound field induced by an annular transducer made of concave spherical piezoelectric ceramic is derived by introducing a negative sound source.
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