不过发现这些裂纹可能很难且费用高昂。
Apart from careful visual inspection, techniques like X-rays and ultrasonic probes are alsoused.
除了仔细地目视检查外,也使用象X射线和超声探头这样的技术。
Now a British company has come up with a low-cost way of monitoring cracks in aircraft,even while they are airborne.
目前一家英国公司提出了一种成本低廉的监测飞机裂纹方法,即使飞机在飞行中。
The trick that Ultra Electronics uses is to listen for them with a system called Asis.
超级电子公司采用的诀窍是侦听带有自动语音识别系统的飞机。
It does this by fitting small piezoelectric acoustic sensors to parts of the structure to detectthe 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。
When first set up, Asis is calibrated to the acoustic signature of the aircraft.
安装之初,Asis就按飞机的声波标记图进行了校准。
The system can point engineers to where cracks are occurring because the sensors alsorecord the precise moment it is heard .
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