基于超声测温的多区节螺旋型波导特性研究

Study on the characteristics of multi-zone truncated spiral waveguide based on ultrasonic temperature measurement

温度测试对于军工、冶金、化工等行业的安全快速发展有着重要的意义,特别是高温环境下的温度测量,超声测温相对于其他测温方法有着测温范围广、响应时间快、测量精度高等优点;如今大多数用于超声温度测试的传感器多为直波导杆,为了应对一些特殊环境(如核反应燃料棒、管道以及一些需要较小传感器的环境等),设计了一种异型的螺旋状分布式波导传感器,可以根据环境的区域大小拉伸、折叠或改变半径调节传感器的尺寸,还可以根据需要加工多个反射缺口,用于同一环境的多点测量。通过实验以及COMSOL仿真拟合钨铼合金(tungsten-rhenium alloy 25,WRe25)的温度曲线,验证其测试温度上限可以达到1600℃。结果表明,测试精度较高,螺旋状波导杆满足高温测试的应用需求,同时为缩小传感器的测试环境以及提高测试精度提供参考。

Temperature test for the safe and rapid development of military,metallurgy,chemical industry and other industries is of great significance,especially temperature measurement in high temperature environment,ultrasonic temperature measurement compared with other temperature measurement methods has the advantages of wide temperature measurement range,fast response time,high measurement accuracy;Nowadays,most of the sensors used for ultrasonic temperature testing are mostly straight waveguide rods,in order to cope with some special environments(such as nuclear reaction fuel rods,pipelines and some environments that require smaller sensors,etc.),a specialshaped spiral distributed waveguide sensor is designed,which can stretch,fold or change the size of the sensor according to the size of the environment area,and can also process multiple reflection notches as needed for multi-point measurement in the same environment.Through experiments and COMSOL simulation to fit the temperature curve of WRe25,it is verified that the upper temperature limit of the test temperature can reach 1600℃.The conclusion shows that the test accuracy is high,and the spiral waveguide rod meets the application requirements of high temperature test,and provides a reference for reducing the test environment of the sensor and improving the test accuracy.