Deposited water defect damage detection method and system for inner part of composite material based on microwave excitation

Abstract

The invention discloses a deposited water defect damage detection method and system for the inner part of a composite material based on microwave excitation. The method mainly comprises the following steps: recording surface infrared radiation of a region to be detected and a change process of a temperature field of the region by adopting a thermal infrared imager (5); analyzing a temperature abnormal region by adopting a microwave excitation selective action principle, and displaying the position and the size of the temperature abnormal region and the change of a temperature difference of a peripheral temperature normal region; and outputting a judging result of the existence of deposited water defects and degrees in the inner part of the composite material, wherein according to the microwave excitation selective action principle, the microwave excitation only has effects on deposited water in a non-conductive composite material, the deposited water can be determined when a high-temperature region exists and other defects do not exist. The method has high detection sensitivity and the result is accurate and reliable; and the operation is convenient and the checking time is short.

Description

technical field [0001] The invention relates to inspection technology for water accumulation defects inside composite materials, in particular to the analysis of the presence or absence of water accumulation defects and the amount of water accumulation in the internal structure of non-conductive composite materials (including honeycomb, interlayer, sandwich, etc.), and belongs to the safety guarantee of composite material structures field. Background technique [0002] Composite material structure is a combination of various materials according to functional needs. Because of its unique characteristics such as high specific strength and high specific stiffness, it has been widely used in aerospace, wind power generation, transportation, construction engineering and other fields. In order to reduce the weight of the structure, composite materials often adopt structural forms such as honeycomb, sandwich, and sandwich, and there are many voids inside. Under the action of exter...

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Problems solved by technology

In the early stage of the formation of water accumulation defects, the amount of water accumulation inside the composite material is small, and the temperature difference formed by the above thermal excitation methods is not obvious, which is easy to cause missed detection; , direction, etc. have a great influence on the excitation effect, and the temperature difference formed by the unknown water accumulation area may not be enough to produce obvious infrared anomalies; accumulation water may appear in various forms in composite materials, such as water column, water droplet, water vapor, etc.

Under the action of the aforementioned excitation method, it is difficult to detect dispersed water droplets, and it is even more difficult to detect diffuse water vapor

[0005] During the service process of the composite material structure, the accumulation of water defects develops monotonously, and it is not easy to be found in the early stage of the defect formation, leaving a large safety hazard for the structure operation

For components such as radomes, it will also reduce the overall performance and even cause greater losses

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