Research On Detection Method Of Metal Surface Defects Based On Microwave Technology

With the improvement of the country’s overall national strength and people’s increasingly abundant material needs,the demand for various energy sources such as oil and natural gas is also increasing.At the present stage,most of China’s storage and transportation of oil,natural gas and other energy sources use metal material containers.It is particularly important to research and test the integrity of metal material containers.In-service metal pipeline are used for a long time,and due to contact with the environment such as air and soil,defects such as cracks and corrosion may occur,and the defects caused by the buried pipeline are difficult to be detected.However,with the increase of time,the degree of defects becomes more serious.If the defects on the surface of metal materials are not found in time and effectively detected,serious consequences will be incalculable.Therefore,timely detection of defects on the surface of metal materials is of great significance to avoid economic losses and major safety accidents.Because microwave detection has the characteristics of fast detection speed,non-contact measurement,high sensitivity,and not affected by extreme and harsh detection environment.Aiming at the problem of metal surface defect detection,the surface defects of metal plates were studied based on microwave detection technology and microwave propagation characteristics theory.The energy transmission characteristics and influencing factors of microwave reflection on the surface of metal plates were obtained.The simulation model of the detection method,the analysis of the microwave energy propagation model on the metal surface,and the analysis of the CST microwave studio finite integral multi-solver analysis were used to establish a simulation model of the microwave waveguide probe for detecting metal surface defects.Study the variation of microwave energy under different size defect types,and explore the relationship between different defects and microwave propagation characteristics.A scientific and effective experimental method was designed to verify the microwave detection theory and build an experimental platform for the detection of metal surface defects on microwaves.Microwave metal surface defect detection experiments were performed on defects of different sizes and depths on the surface of metal plates,and different defects and microwaves were obtained.Relationship between propagation characteristics.The simulation analysis data is compared with the experimental result data,the characteristics of microwave propagation energy and the influence of different defects on the microwave detection signal are analyzed,and the accuracy of the simulation model of the surface defect of the metal plate by the waveguide probe is verified.The results show that: under the excitation of a microwave probe,defects on the metal surface can be accurately detected;for different types of defect types,there is a qualitative relationship between the microwave propagation characteristics and the defect size.Verifies the feasibility of using microwave technology to detect metal surface defects.