The popular non destructive test methods for the foam-cored sandwich structure are reviewed; including air coupled ultrasonic method, pulse-echo ultrasonic method and shearogragh method.
回顾了泡沫夹层结构常用的无损检测方法：空气耦合超声方法、脉冲回波超声方法以及激光错位散斑干涉方法。
At present, more and more people focus on the research of Synthetic Aperture Radar (SAR) echo signal simulator, which is an important instrument for the design, research and test of SAR system.
合成孔径雷达(SAR)回波模拟技术是合成孔径雷达设计、研制和测试的必要手段，回波模拟技术已经成为当前的一个热点研究课题。
SAR echo simulator can support SAR system design with database, is the necessary instrument for the design, research and test of SAR system.
SAR回波模拟器能为SAR系统方案设计提供有效的数据支持，是SAR系统设计、研制和测试的必要手段。
To test for the ringing acoustic signatures of tiny bubbles, physicist Helen Czerski of University of Rhode Island has devised a specially-designed echo chamber about the size of a soccer ball.
为了测试微小气泡的声学特征，罗得岛大学物理学家海伦切尔斯基制定了一个足球大小的特别回音球。
Packet Internet Groper a program used to test whether a particular network destination is online, by sending an Internet control message protocol echo request and waiting for a response.
包因特网查询工具用于通过发送一个Internet控制消息协议回送请求并等待应答来测试一个特定网络目的地是否联机的一种程序。
Packet Internet Groper a program used to test whether a particular network destination is online, by sending an Internet control message protocol echo request and waiting for a response.
包因特网查询工具用于通过发送一个Internet控制消息协议回送请求并等待应答来测试一个特定网络目的地是否联机的一种程序。
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