一种基于微带天线的金属裂纹检测传感器

A Metal Crack Detection Sensor Based on Microstrip Antenna

针对金属结构的无损监测,利用微带贴片天线的谐振频率主要由其尺寸参数和介质基层材料特性的物理参数决定的特性,提出了一种用于金属裂纹实时检测的微波传感器。该传感器基于微带贴片天线结构,将银金属浆料集成于高温共烧陶瓷陶瓷上,以适应航天发动机和涡轮机内部的高温、高压等恶劣环境。因此,主要从传感器的测试原理、仿真、裂纹的扩展方向和宽度检测等方面进行研究。实验发现,沿贴片长度方向产生的裂纹存在时,最低灵敏度为72 MHz/mm。测试结果验证了仿真结果的正确性,表明该传感器能够为环境提供准确可靠的数据。

In this paper,aiming at the non-destructive monitoring of metal structures such as aerospace engine and turbine in harsh environment,the resonant frequency of microstrip patch antenna is mainly determined by its size parameters and physical parameters of dielectric base materials.A microwave sensor for real-time detection of metal cracks is proposed.Based on the microstrip patch antenna structure,the sensor integrates silver metal slurry into high temperature co-fired ceramic ceramics to adapt to the harsh environment such as high temperature and high pressure in aerospace engine and turbine.This paper mainly studies the testing principle,simulation and crack propagation direction and width detection of the sensor.It is found that the lowest sensitivity is 72 MHz/mm when there is a crack along the length of the patch.The test results verify the correctness of the simulation results,and show that the sensor can provide accurate and reliable data for the applied environment.