THE MATCHING LAYER DESIGN OF BOREHOLE WALL ULTRASONIC IMAGING LOGGING TRANSDUCER

摘要：

In this paper,the finite element method is used to investigate the influence of matching layer on the center frequency and the frequency bandwidth when the borehole wall ultrasonic imaging logging transducer operates in the mud.Our numerical results show that the characteristic impedance and the thickness of the matching layer influence the resonance frequency and the harmonic peak.With the increase of the characteristic impedance,the first order thickness mode resonant frequency reduces while the second order increases,which makes the valley deeper and deeper on the curve of conductance.When the characteristic impedance reaches a certain value,the center frequency and -3dB relative bandwidth steeply change.With the increase of the thickness of the matching layer would lower the first and second order thickness mode resonant frequency,the -3dB relative bandwidth increases at first then decreases that leaves the maximum.The value range of the characteristic impedance and the thickness of the matching layer is obtained for a certain frequency bandwidth.This work can be used to lower the manufacture difficulty and increase the range of matching layer material choice.

关键词： The matching layer Ultrasonic transducer Center frequency Frequency bandwidth

作者: Lin FU Yong-kang GAO De-lin WU

作者单位: State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing, 100190, China

会议类型: 国际会议

会议名称: The 2016 Symposium on Piezoelectricity,Acoustic Waves and Device Applications(2016全国压电和声波理论及器件技术研讨会)

会议地点: 西安

会议语种:英文

页码: 331-334

在线出版日期: 2016-10-21（万方平台首次上网日期，不代表论文的发表时间）