用于金属裂缝检测和测量的微带天线传感器

Microstrip Antenna Sensor for Metal Crack Detection and Measurement

文中基于微带天线辐射原理设计了用于金属裂缝检测和表征的传感器。传感器实质是由一个金属谐振腔制成,金属谐振腔的谐振频率对传感器的辐射贴片和金属地的电特性极其敏感。把被测金属结构当作传感器的金属地,金属结构的裂缝扩展导致了传感器谐振频率的偏移。因此,通过读取传感器谐振频率的偏移量来检测和表征金属裂缝。从传感器辐射贴片的两个方向对金属裂缝进行了测试,通过实验测试发现:当金属裂缝沿辐射贴片宽度方向存在时,传感器的检测灵敏度是18 MHz/mm,当裂缝沿辐射贴片长度方向存在时,传感器的检查灵敏度是27.5 MHz/mm。传感器由耐高温的氧化铝和金属银浆料制成,因此可以应用到一些高温、高压恶劣环境下。

This paper presented a sensor based on the radiation principle of microstrip antenna for metal crack detection and characterization.The sensor is essentially made up of a metal cavity,the resonant frequency of which is sensitive to the electrical characteristics of the radiation patch and metal ground of the sensor.We regard the metal structure to be tested as the metal ground of the sensor.The crack propagation of the metal structure causes the resonance frequency of the sensor to shift.Therefore,metal cracks were detected and characterized by measuring the offset of the resonant frequency of the sensor.We tested the metal crack from the two directions of the radiation patch.Through the experimental test,it was found that when the metal crack exists along the width direction of radiation patch,the detection sensitivity of the sensor is 18 MHz/mm,when the crack exists along length direction of radiation patch,the sensitivity is 27.5 MHz/mm.The sensor is made of high temperature ceramic alumina and metallic silver paste,which allows the sensor to be used in some high temperature,high pressure harsh environments.