A nonlinear propagation model-based phase calibration technique for membrane hydrophones
A nonlinear propagation model-based phase calibration technique for membrane hydrophones
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DOI：
10.1109/tuffc.2008.619
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发表时间：
2008-01-01
影响因子：
3.6
通讯作者：
Humphrey, Victor F.
中科院分区：
文献类型：
--
作者：
Cooling, Martin P.;Humphrey, Victor F.
本文介绍了一种在80 MHz频率范围内对薄膜水听器进行相位校准的方法。这是通过比较测量和数值模拟的非线性失真的测试领域。使用有限差分模型在频域中求解非线性Khokhlov-Zabolotskaya-Kuznetsov（KZK）方程来获得场预测。测量是在远场的3.5 MHz的聚焦圆形换能器中，它被证明，对于所使用的高驱动水平，空间平均效应，由于水听器的有限接收面积是可以忽略不计的。该方法提供了一个相位校准的水听器在测试中，而不需要一个设备作为相位响应参考，但它需要在基频的振幅灵敏度的先验知识。该技术被证明使用50 μ m厚的双层膜水听器，所获得的结果显示与预测的水听器响应模型的功能协议。进一步验证的结果是通过应用程序的高振幅波形产生的现代生物医学超声成像系统的测量的响应。它表明，完全反卷积的计算复杂的频率响应的非理想水听器的结果在物理上真实的测量的发射波形。
A technique for the phase calibration of membrane hydrophones in the frequency range up to 80 MHz is described. This is achieved by comparing measurements and numerical simulation of a nonlinearly distorted test field. The field prediction is obtained using a finite-difference model that solves the nonlinear Khokhlov-Zabolotskaya-Kuznetsov (KZK) equation in the frequency domain. The measurements are made in the far field of a 3.5 MHz focusing circular transducer in which it is demonstrated that, for the high drive level used, spatial averaging effects due to the hydrophone's finite-receive area are negligible. The method provides a phase calibration of the hydrophone under test without the need for a device serving as a phase response reference, but it requires prior knowledge of the amplitude sensitivity at the fundamental frequency. The technique is demonstrated using a 50-mu m thick bilaminar membrane hydrophone, for which the results obtained show functional agreement with predictions of a hydrophone response model. Further validation of the results is obtained by application of the response to the measurement of the high amplitude waveforms generated by a modern biomedical ultrasonic imaging system. It is demonstrated that full deconvolution of the calculated complex frequency response of a nonideal hydrophone results in physically realistic measurements of the transmitted waveforms.