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An image of the future 印刷未来 One of the biggest manufacturers in the worldgives 3D printing a go 世界龙头机器制造商用3D印刷术进行了一次格外成功的应用 ULTRASOUND scanners are used for tasks as diverse as examining unborn babies andsearching for cracks in the fabric of aircraft. 超声波扫描器的应用领域很广，小到用于检查胎儿，大到飞行器机体瑕疵检测等。 They work by sending out pulses of high-frequency sound and then interpreting thereflections as images. 机理过程是，通过发射高频声波脉冲信号对反射信号进行成像解读。 To do all this, though, you need a device called a transducer. 但完成该过程，你不能缺少一台叫做压电式换能器的设备。 Transducers are made from arrays of tinypiezoelectric structures that convert electrical signals into ultrasound waves by vibrating atan appropriate frequency. 压电式换能器是由具有压电效应的一系列敏感元件机构组成。敏感元件机构通过定频震荡将电信号转换成超声波。 Their shape focuses the waves so that they penetrate the object being scanned. 机构的特定外形可聚焦超声波，对被扫描的物体产生穿透作用。 | 
