• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Broadband PVDF Membrane Hydrophone for Comparisons of Hydrophone Calibration Methods up to 140 MHz
【24h】

Broadband PVDF Membrane Hydrophone for Comparisons of Hydrophone Calibration Methods up to 140 MHz

机译：宽带PVDF膜水听器，用于比较高达140 MHz的水听器校准方法

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A PVDF membrane hydrophone has been constructed in particular for comparisons of broadband ultrasound hydrophone calibration methods and of the results obtained by different laboratories. Intercomparisons have to accompany the efforts currently undertaken to enhance the calibration frequency ranges and to implement the extension from the determination of amplitude-only to complex-valued calibration data. It can be expected that such hydrophone data will be used much more frequently in the future for exposure measurements on medical ultrasound equipment, in particular for the detection of non- linearly distorted waveforms. The hydrophone design chosen has a foil thickness of 9 mum and an electrode diameter of 210 mum. A broadband differential preamplifier ( -3 dB roll-off frequency: 95 MHz) is integrated to achieve a high signal-to-noise ratio over a broad frequency range (e.g., 26 dB-30 dB in the range 50 MHz to 140 MHz for measurements of nonlinearly distorted pulses). The hydrophone response was characterized by means of a primary interferometric calibration technique, by substitution calibration using time-delay spectrometry, and by complex broadband pulse calibration using nonlinear sound propagation. The results show a flat frequency response up to 40 MHz (maximum variations below plusmn0.6 dB) and a thickness mode resonance at about 105 MHz. They indicate a useable bandwidth up to 140 MHz. The effective diameter as derived from directional response measurements is 240 mum at frequencies beyond 15 MHz.
机译：PVDF膜水听器特别是用于比较宽带超声水听器校准方法和不同实验室获得的结果。比对必须伴随当前为增强校准频率范围和实现从仅幅度确定到复数值校准数据的扩展而进行的努力。可以预料，将来这种水听器数据将更频繁地用于医学超声设备上的曝光测量，尤其是用于检测非线性失真的波形。选择的水听器设计的箔厚度为9微米，电极直径为210微米。集成了宽带差分前置放大器（-3 dB滚降频率：95 MHz），以在较宽的频率范围内实现高信噪比（例如，对于50 MHz至140 MHz，26 dB-30 dB测量非线性失真的脉冲）。水听器响应的特征在于主要的干涉校准技术，使用时延光谱的替代校准以及使用非线性声音传播的复杂宽带脉冲校准。结果显示出高达40 MHz的平坦频率响应（最大变化低于plusmn0.6 dB）和约105 MHz的厚度模式谐振。它们指示高达140 MHz的可用带宽。从方向响应测量得出的有效直径在15 MHz以上的频率下为240 mm。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号