Contemporary phased array probes for industrial NDT applications are typically constructed around piezocomposite materials, which are made of many tiny,thin rods of piezocomposite embedded in a polymer matrix. While they can be more challenging to manufacture, composite probes typically offer a 10dB to 30dB sensitivity advantage over piezoceramic probes of otherwise similar design. Segmented metal plating is used to divide the composite strip into a number of electrically separate elements that can be pulsed individually. This segmented element is then incorporated into a probe assembly that include a protective matching layer, a backing, cable connections and a housing(see Figure 2-17). 用于工业NDT的现代相控阵探头一般由压电复合材料构建,具体地说就是许多细小、极薄的压电陶瓷棒被嵌在聚合物矩阵中。虽然制造这种探头会复杂一些,但是与在其它方面设计相似的压电陶瓷探头相比,这种复合材料探头在一般情况下可提供的灵敏度会高出10dB 到 30dB。 分成小段的金属镀层用于将条状的复合材料分割成若干可单独接收电子脉冲激励的晶片个体。这个被分割成小段的晶片被装入探头组合件中。探头组合件包含一个保护性匹配层、一个背衬层、线缆连接器以及一个外壳(参见图2-17)。 |