Material Defect Detection Technology Based On Microwave Thermal Infrared Imaging

Radar stealth is a key guarantee for the survival and combat effectiveness of weapons and equipment.Radar absorbing coating is the core material of stealth technology.During the application and use of absorbing coating,coating defects will not only affect the stealth performance of the whole machine.At the same time,the life of the coating material may be shortened,thereby threatening the safety of the whole machine.Therefore,the defect detection technology of the absorbing coating is an important supporting technology for the performance guarantee of weapon equipment.Regarding material defect detection technology,extensive research has been carried out at home and abroad.This article takes radar absorbing coating materials as the research object,and develops material defect detection technology based on microwave heating infrared imaging.This article first introduces the main methods and devices of material defect detection at home and abroad.In the specific detection environment,compare the advantages and disadvantages of different methods to choose the appropriate detection method.According to the high-loss microwave characteristics of the coating material,this paper finally uses the method of microwave thermal infrared imaging to detect the internal defects of the material.The system includes hardware and software,and is composed of microwave source,power amplifier,microwave heating antenna,infrared imaging module,defect location and type identification algorithm,simulated defective parts or materials with defects,and microwave darkroom environment.This article introduces the advantages of microwave heating method,and discusses the implementation method,theoretical basis,and difficulties of practical operation of microwave heating method.This article also introduces the algorithm of defect identification to identify the position and type of the defect in the material to be tested,and establishes an equivalent model of the system and makes a prototype.The accuracy of the algorithm is analyzed based on the measured data.This article also takes into account the rationality of mechanical design and size,as far as possible to achieve system integration and miniaturization.In this paper,the microwave heating antenna is used to radiate the microwave energy amplified by the power amplifier to the space in the dark room.The material to be tested is located in the far field environment of the antenna and the energy of the antenna in the direction of the material to be tested is as uniform as possible.The microwave heating ratio The traditional heating method is more rapid and uniform,which can ensure that there is a temperature gap between the defect and the defect-free place.Infrared imaging collects the temperature data of the material,and the defect identification algorithm uses and processes these data to distinguish the location and type of the defect.Finally,this paper builds a system to complete the test and analyze the error.The method of defect detection technology used in this article has the following advantages: first,the microwave heating method used in this article is more uniform and rapid than traditional heating methods,which is conducive to identifying defects within the material;second,the high degree of system integration,to The algorithm and antenna are the core parts,and no large microwave darkroom is needed,which is convenient for measurement.Third,the software written by the algorithm is more convenient for the tester to operate.The tester mainly operates the software interface during the test,which has little interference to the test system and the test is repeated.Good sex and stability.This article has completed the testing of several parts to be tested,and successfully identified the location of the material defects,and basically detected the level of material defects.