• 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 >A digital beamformer for high-frequency annular arrays
【24h】

A digital beamformer for high-frequency annular arrays

机译：用于高频环形阵列的数字波束形成器

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

Digital transmit and receive beamformers for a 45-MHz, 7-element annular array are described. The transmit beamformer produces 0- to 80-Vpp monocycle pulses with a timing error of less than /spl plusmn/125 ps. Up to four adjustable transmit focal zones can be selected. The dynamic receive beamformer uses a variable frequency sampling technique in which the frequency of analog-to-digital conversion on each channel is adjusted as the signals are received. The variable frequency clock signals required to trigger analog-to-digital conversion are obtained using a pair of high-frequency field-programmable gate arrays and a precision quartz oscillator. The gate arrays are also used to sum the digitized signals. A maximum receive beamformer timing error of less than /spl plusmn/900 ps was obtained on each channel. The performance of the combined transmit and receive beamformer was tested by imaging wire phantoms. Images of CD-1 mice were also generated. The system produced images with a dynamic range of 60 dB.
机译：描述了用于45 MHz，7要素环形阵列的数字发射和接收波束形成器。发射波束形成器产生0至80 Vpp单周期脉冲，定时误差小于/ spl plusmn / 125 ps。最多可以选择四个可调发射焦点区域。动态接收波束形成器使用可变频率采样技术，其中随着接收信号调整每个通道上的模数转换频率。触发一对数转换所需的可变频率时钟信号是使用一对高频现场可编程门阵列和一个精密石英振荡器获得的。门阵列也用于对数字化信号求和。在每个通道上获得的最大接收波束成形器定时误差小于/ spl plusmn / 900 ps。组合的发射和接收波束形成器的性能通过成像线体模进行了测试。还生成了CD-1小鼠的图像。系统产生的动态范围为60 dB的图像。

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