Membrane hydrophone phase characteristics through nonlinear acoustics measurements.
Membrane hydrophone phase characteristics through nonlinear acoustics measurements.
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通过非线性声学测量的膜水听器相位特性。
DOI：
10.1109/tuffc.2011.2099
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Lewin,PeterA
中科院分区：
文献类型：
--
作者：
Bloomfield,PhilipE;Gandhi,Gaurav;Lewin,PeterA
这项工作认为需要的幅度和相位，以充分表征聚偏氟乙烯（PVDF）膜水听器，并提出了一个全面的讨论，利用非线性声学测量提取的相位信息和实验结果，两个广泛使用的PVDF膜水听器高达100 MHz。半经验计算机模型利用双曲线传播算子预测非线性压力场，并提供相应源换能器的复频率响应。PVDF水听器的相位特性，这是直接从计算机建模的非线性场模拟和相应的测量的谐波频率相位值之间的差异，同意从接收传递函数模拟的基础上，膜的物理特性的软件建模获得的相位预测在10%以内。通过一系列的阻抗测量和接收传递函数模拟的水听器，包括其硬线同轴电缆的电缆负载效应和膜水听器的谐振进行了区分和识别。结果表明，PVDF薄膜水听器的相位-频率曲线呈现出关于单调递减线的振荡。最大和最小拐点斜率分别出现在膜厚度共振和反共振处。在100 MHz时，连接了1 m电缆的水听器出现了电缆谐振，但连接了较短的0.65 m电缆的水听器未出现电缆谐振。
This work considers the need for both the amplitude and phase to fully characterize polyvinylidene fluoride (PVDF) membrane hydrophones and presents a comprehensive discussion of the nonlinear acoustic measurements utilized to extract the phase information and the experimental results taken with two widely used PVDF membrane hydrophones up to 100 MHz. A semi-empirical computer model utilized the hyperbolic propagation operator to predict the nonlinear pressure field and provide the complex frequency response of the corresponding source transducer. The PVDF hydrophone phase characteristics, which were obtained directly from the difference between the computer-modeled nonlinear field simulation and the corresponding measured harmonic frequency phase values, agree to within 10% with the phase predictions obtained from receive-transfer-function simulations based on software modeling of the membrane's physical properties. Cable loading effects and membrane hydrophone resonances were distinguished and identified through a series of impedance measurements and receive transfer function simulations on the hydrophones including their hard-wired coaxial cables. The results obtained indicate that the PVDF membrane hydrophone's phase versus frequency plot exhibits oscillations about a monotonically decreasing line. The maxima and minima inflection point slopes occur at the membrane thickness resonances and antiresonances, respectively. A cable resonance was seen at 100 MHz for the hydrophone with a 1-m cable attached, but not seen for the hydrophone with a shorter 0.65-m cable.