Elimination of ultrasonic tailing based on the superposition method

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (2) : 219-225.

ZHENG Guanru, ZHANG Hui, LI Zhi, ZENG Zhoumo

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Abstract

A method aiming at eliminating the ultrasonic tailing in the output signals of a capacitive micromachined ultrasonic transducer(CMUT) was proposed the principle of CMUT was introduced,and an equivalent mass-spring-damper model was established by equivalently lumping the parameters of the CMUT.The reason of the appearance of CMUT’s tailing signal was explained and the relationship between the pulse width and the length of the tailing signal was analyzed.An opposite phase excitation signal was designed,and the effectiveness of the superposition method was proved.A test system was designed,containing a FPGA,a signal drive circuit,a signal extraction circuit and a signal acquisition card.The experiments verify the effectiveness of the method for decreasing blind zones.

Key words

CMUT / ultrasonic tailing / blind distance / spring-mass-damper model

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ZHENG Guanru, ZHANG Hui, LI Zhi, ZENG Zhoumo. Elimination of ultrasonic tailing based on the superposition method[J]. Journal of Vibration and Shock, 2019, 38(2): 219-225

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