THE MATCHING LAYER DESIGN OF BOREHOLE WALL ULTRASONIC IMAGING LOGGING TRANSDUCER
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- 英文论文题名：THE MATCHING LAYER DESIGN OF BOREHOLE WALL ULTRASONIC IMAGING LOGGING TRANSDUCER
- 论文作者：Lin FU ; Yong-kang GAO ; Xiu-ming WANG
- 英文论文作者：Lin FU ; Yong-kang GAO ; Xiu-ming WANG ; State Key Laboratory of Acoustics ; Institute of Acoustics ; Chinese Academy of Sciences
- 年：2016
- 作者机构：State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences;
- 英文论文关键词：Matching layer ; Ultrasonic transducer ; Center frequency ; Frequency bandwidth
- 会议召开时间：2016-10-21
- 会议录名称：2016年全国压电和声波理论及器件应用研讨会论文摘要集
- 英文会议录名称：Abstract Book of 2016 Symposium on Piezoelectricity, Acoustic Waves and Device Applications
- 语种：英文
- 分类号：TB552
- 学会代码：AGLU
- 会议名称：2016年全国压电和声波理论及器件应用研讨会
- 会议地点：中国陕西西安
- 主办单位：中国力学学会、中国声学学会、IEEE UFFC分会
- 学会名称：中国力学学会
- 页数：2
- 文件大小：10k
- 原文格式：D
- 会议级别：全国
摘要
Background, Motivation and Objective Acoustic matching layer of ultrasonic transducer is designed for impedance matching between piezoelectric disk and transmission medium, as it plays the role of increasing the sound energy transmission and widening the frequency bandwidth. Previous research tells us the quantitative value of the characteristic impedance and thickness of perfect matching layer. However the exact value of characteristic impedance and thickness is difficult to manufacture. In this paper, we studied the matching layer value range of characteristic impedance and thickness in order to achieve a certain bandwidth. Statement of Contribution/Methods Using finite element method, we studied the influence of matching layer on the center frequency and frequency bandwidth when the ultrasonic transducer operates in the mud. The value range of characteristic impedance and thickness of matching layer is obtained for certain frequency bandwidth. The results can be used to decrease the manufacture difficulty and increase the range of matching layer material choice. Results The thickness and characteristic impedance of the matching layer change the resonance and the height of harmonic peak, so the center frequency and-3d B relative bandwidth accordingly change. To be specific, increasing the thickness of the matching layer would lower the first and second order thickness mode resonant frequency, and the response amplitude of the first resonance reduces while the response amplitude of the second resonance increases. The-3d B relative bandwidth increases at first then decreases that leaves the maximum. With the increasing of the characteristic impedance of matching layer, 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 the certain value, the center frequency and-3d B relative bandwidth steeply change. Discussion and Conclusions We can conclude from the results that adding the matching layer have the effect of widening frequency bandwidth compared to without matching layer. When the frequency bandwidth is the widest, the corresponding characteristic impedance and thickness of the matching layer are different from the theoretical perfect matching layer. The reason is that the theoretical perfect matching layer is calculated from the maximum sound energy transmission. It implies that the widest bandwidth and the maximum sound energy transmission correspond to different characteristic impedance and thickness of the matching layer. So in practical application, it is a trade-off of transducer performance in order to fulfill the measurement.
Background, Motivation and Objective Acoustic matching layer of ultrasonic transducer is designed for impedance matching between piezoelectric disk and transmission medium, as it plays the role of increasing the sound energy transmission and widening the frequency bandwidth. Previous research tells us the quantitative value of the characteristic impedance and thickness of perfect matching layer. However the exact value of characteristic impedance and thickness is difficult to manufacture. In this paper, we studied the matching layer value range of characteristic impedance and thickness in order to achieve a certain bandwidth. Statement of Contribution/Methods Using finite element method, we studied the influence of matching layer on the center frequency and frequency bandwidth when the ultrasonic transducer operates in the mud. The value range of characteristic impedance and thickness of matching layer is obtained for certain frequency bandwidth. The results can be used to decrease the manufacture difficulty and increase the range of matching layer material choice. Results The thickness and characteristic impedance of the matching layer change the resonance and the height of harmonic peak, so the center frequency and-3d B relative bandwidth accordingly change. To be specific, increasing the thickness of the matching layer would lower the first and second order thickness mode resonant frequency, and the response amplitude of the first resonance reduces while the response amplitude of the second resonance increases. The-3d B relative bandwidth increases at first then decreases that leaves the maximum. With the increasing of the characteristic impedance of matching layer, 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 the certain value, the center frequency and-3d B relative bandwidth steeply change. Discussion and Conclusions We can conclude from the results that adding the matching layer have the effect of widening frequency bandwidth compared to without matching layer. When the frequency bandwidth is the widest, the corresponding characteristic impedance and thickness of the matching layer are different from the theoretical perfect matching layer. The reason is that the theoretical perfect matching layer is calculated from the maximum sound energy transmission. It implies that the widest bandwidth and the maximum sound energy transmission correspond to different characteristic impedance and thickness of the matching layer. So in practical application, it is a trade-off of transducer performance in order to fulfill the measurement.
Background, Motivation and Objective Acoustic matching layer of ultrasonic transducer is designed for impedance matching between piezoelectric disk and transmission medium, as it plays the role of increasing the sound energy transmission and widening the frequency bandwidth. Previous research tells us the quantitative value of the characteristic impedance and thickness of perfect matching layer. However the exact value of characteristic impedance and thickness is difficult to manufacture. In this paper, we studied the matching layer value range of characteristic impedance and thickness in order to achieve a certain bandwidth. Statement of Contribution/Methods Using finite element method, we studied the influence of matching layer on the center frequency and frequency bandwidth when the ultrasonic transducer operates in the mud. The value range of characteristic impedance and thickness of matching layer is obtained for certain frequency bandwidth. The results can be used to decrease the manufacture difficulty and increase the range of matching layer material choice. Results The thickness and characteristic impedance of the matching layer change the resonance and the height of harmonic peak, so the center frequency and-3d B relative bandwidth accordingly change. To be specific, increasing the thickness of the matching layer would lower the first and second order thickness mode resonant frequency, and the response amplitude of the first resonance reduces while the response amplitude of the second resonance increases. The-3d B relative bandwidth increases at first then decreases that leaves the maximum. With the increasing of the characteristic impedance of matching layer, 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 the certain value, the center frequency and-3d B relative bandwidth steeply change. Discussion and Conclusions We can conclude from the results that adding the matching layer have the effect of widening frequency bandwidth compared to without matching layer. When the frequency bandwidth is the widest, the corresponding characteristic impedance and thickness of the matching layer are different from the theoretical perfect matching layer. The reason is that the theoretical perfect matching layer is calculated from the maximum sound energy transmission. It implies that the widest bandwidth and the maximum sound energy transmission correspond to different characteristic impedance and thickness of the matching layer. So in practical application, it is a trade-off of transducer performance in order to fulfill the measurement.
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