Abstract
Given the limitations of conventional crosswell seismic sources, which struggle to reduce frequency by elongating the axial dimension of the transducer, this study introduces an innovative method for frequency reduction in such sources. The proposed approach entails adding metal end caps with orifices to the piezoelectric circular tube with both ends open. This modification transforms the originally cylindrical liquid cavity with both ends open into a dual-port Helmholtz liquid cavity. To begin with, the frequency reduction effect of the dual-port Helmholtz liquid cavity is theoretically demonstrated using the equivalent circuit method. Subsequently, the finite element method is employed to validate the accuracy of the equivalent circuit and to compare the radiation performance of the two transducer models. Further, the impact of the materials and structural parameters of end caps on the resonant frequency of the liquid cavity is investigated using the finite element method. Finally, four transducer prototypes are fabricated, and their conductance curves are tested in silicone oil to verify the feasibility of the proposed approach. The test results affirm that the dual-port Helmholtz transducer exhibits a lower resonant frequency of the liquid cavity, which aligns well with the simulation results. The proposed dual-port Helmholtz transducer offers a promising solution for achieving low-frequency emission in crosswell seismic sources. The research findings establish a solid theoretical foundation for the design and optimization of this transducer.
Published Version
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