High Temperature Gallium Orthophosphate Transducers for NDT
High Temperature Gallium Orthophosphate Transducers for NDT
复制标题
用于无损检测的高温正磷酸镓传感器
DOI：
10.1016/j.proeng.2016.11.322
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Kostan M
中科院分区：
文献类型：
--
作者：
Kostan M
已制造出一种传感器，用于开发超声波系统，可在高达580°C的温度下运行，用于发电厂的无损检测（NDT）和监测。所制造的传感器具有基于压电单晶正磷酸镓（GaPO 4）的简单设计，该压电单晶正磷酸镓（GaPO 4）允许在本研究所需的相当高的温度（HT）水平下进行超声测量。通常，当执行HT超声NDT时，一个关键方面-与测试材料的声耦合已经使用市售HT银粘合剂解决，该粘合剂提供了将换能器永久安装在待测结构上。这也意味着，对于工业环境中的未来应用，钻孔和/或机加工干预要求将显著降低。最后，通过对含有已知几何形状（d =0.8 mm的侧钻孔（SDH））的人造缺陷的钢块进行测量，成功测试了GaPO 4传感器的灵敏度（f=3.5 MHz），目标温度为580°C，保持缺陷的信噪比（SNR）高于6 dB，足以用于NDT实践。
A transducer has been manufactured leading towards development of an ultrasonic system to operate up to 580°C for non-destructive testing (NDT) and monitoring in power plants. The manufactured transducer has a simple design based on the piezoelectric single crystal gallium orthophosphate (GaPO4) which allows ultrasonic measurements to be performed up to considerably high temperature (HT) levels required in this study. Usually a critical aspect when performing HT ultrasonic NDT– acoustic coupling to the test-material, has been resolved using a commercially available HT silver adhesive which provides permanent installation of the transducer on the structure to be tested. This also means that for future application in an industrial environment drilling and/or machining intervention requirements will be reduced significantly. Finally, the GaPO4transducer's sensitivity (f=3.5 MHz) has been successfully tested through measurements on a steel block containing an artificial defect with known geometry (side-drilled hole (SDH) withd=0.8 mm) up to the target temperature of 580°C keeping the defect's signal-to-noise ratio (SNR) above 6 dB which is high enough for NDT practice.