An experimental cantilever beam example shows that the method can detect crack location with satisfactory precision.

对悬臂梁结构测试例子的分析表明，该方法能较好地识别具有单个裂纹结构的裂纹位置。

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It does this by fitting small piezoelectric acoustic sensors to parts of the structure to detect the particular frequency of noise caused by a crack in aircraft-grade aluminium.

把小型压电声传感器安装到这种构造部位上，检测由航空级铝材裂纹所致的特定频率的噪音，靠这样就能监测飞机裂纹。

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The moment that sensors detect a hairline crack anywhere in the aircraft, microscopic nano-capsules containing a high-tech adhesive would be released to seal the fissure.

当传感器检测到飞机在任何时候的一个裂痕时，包含高科技粘合剂的微观纳米胶囊将释放粘合裂痕。

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WifiSLAM, which is roughly two years old, is among a slew of technology companies trying to crack the problem of how to detect a mobile-phone user's location when the user is indoors and traditional GPS technology doesn't work.

WSJ: Apple Buys Indoor GPS Specialist