Optimization of Comb Transducer Based on Mutual Admittance Principle

An optimization design method based on mutual admittance principle was proposed in this paper. In order to improve the amplitude of the received signal and to reduce the ringing tail phenomenon,the time-frequency features of the equal spaced transducer array should be optimized upon the structural parameters. Based on the numerical simulation, a surface wave was excited on an aluminium plate. The key parameters,such as element spacing,element width and element number of comb transducer,which would affect the amplitude and the waveform of the received signals significantly,were analysed through the finite element method. The tail phenomenon is weak when the width of single element is small. And the amplitude of received signals increase with the element number,however,the waveform tail gets stronger. The ratio of element spacing versus the excitation wavelength of comb surface wave transducer possesses great influence on the amplitude of received signal. The received signal of comb surface wave transducer is better when the array element spacing is equal to the excitation wavelength based on the mutual admittance principle and the time-frequency analysis.