研究表明：（1）通过设计合理的检测系统，实现激光超声与散斑干涉技术融合

Research shows that: <br>(1) By designing a reasonable detection system to realize the fusion of laser ultrasonic and speckle interference technology, it can simultaneously perform laser ultrasonic non-contact non-destructive testing of composite material defects and non-contact electronic speckle interference based on carrier electronic speckle interference Defect detection. <br>(2) By selecting a reasonable laser ultrasonic excitation source, it not only meets the laser ultrasonic excitation source optical power requirements, but also meets the ultrasonic infrared requirements for the excitation source frequency, and can simultaneously perform laser ultrasonic non-contact non-destructive detection and detection of composite material defects. Ultrasonic infrared thermal imaging detection. <br>(3) Based on the above conclusions, it is feasible to integrate the three detection technologies of laser ultrasound, speckle interference, and infrared thermal imaging to realize the simultaneous detection of complex defects in carbon fiber composite materials. <br>In addition, research shows that the application of terahertz time-domain spectroscopy detection system can realize the identification and detection of related defects in carbon fiber composite materials. The research conclusions are as follows: <br>(1) Different defect samples have different structural features at the defects, and this structural feature causes Defects have different refractive index and absorption coefficient for terahertz waves. Except for high-temperature damage, the other three types of defect samples have absorption peaks at different positions. At the same time, the terahertz time-domain waveform amplitude of the defect samples attenuates and the frequency domain The frequency attenuation satisfies: hole defect>impact defect>thermal damage>high temperature damage; <br>(2) Use transmission and reflection modes to detect defective PP and PP-LGF adhesive sheets. The results show that the imaging inspection map in transmission mode can more accurately reflect the two-dimensional plane position information of the defects in the sample. In the reflection mode, by selecting the reflection echo imaging method at different positions, the image can reflect the three-dimensional depth information of the defect in the sample to a certain extent. At the same time, the reflection mode can show the small wear defects of the bottom plate surface in the sample that are not obvious in the transmission imaging. By combining the two imaging modes, more specific defect characteristic information of the tested sample can be obtained.

Studies have shown that:<br>(1) By designing a reasonable detection system to achieve the fusion of laser ultrasound and spot-dispersing interference technology, laser ultrasonic non-contact non-destructive detection of composite defects and non-contact electron spot-dispersing interference detection based on carrier electron spot interference can be carried out simultaneously.<br>(2) By selecting a reasonable laser ultrasonic excitation source, so that it not only meets the optical power requirements of the laser ultrasonic excitation source, but also meets the requirements of the ultrasonic infrared for the frequency of the excitation source, the laser ultrasonic non-contact non-destructive detection and ultrasonic infrared thermal image detection of composite defects can be carried out simultaneously.<br>(3) Based on the above conclusions, it is feasible to combine the three detection techniques of laser ultrasound, spot interference and infrared thermal image to realize the simultaneous detection of complex defects of carbon fiber composite materials.<br>In addition, the study shows that the application of tyhertz time domain spectroscopy detection system can achieve the identification and detection of carbon fiber composite material-related defects, and the conclusions are as follows:<br>(1) Different defect samples have different structural characteristics at the defect, which cause the defect to have different refractive index and absorption coefficient of tyhertz wave, in addition to high temperature damage, the other three defect samples in different locations have absorption peaks, while the degree of tyhertz waveform amplitude attenuation and frequency domain frequency attenuation of defect samples are satisfied: hole defects >rout defects> thermal damage> high temperature damage;<br>(2) The defective PP and PP-LGF adhesive plates are detected using both transmission and reflection modes. The results show that the imaging map in transmission mode can more accurately react to the defective two-dimensional plane position information in the sample. In reflection mode, by selecting different positions to reflect the echo imaging method, the image can reflect the defect in the sample three-dimensional depth information to a certain extent. At the same time, reflection mode can show small wear defects on the surface of the substrate in samples that are not obvious in transmission imaging. By combining the two imaging modes, more specific sample defect characteristic information can be obtained.

Research shows:<br>(1) By designing a reasonable detection system, the fusion of laser ultrasonic and speckle interferometry technology can be realized, and the laser ultrasonic non-contact nondestructive detection of composite defects and the non-contact electronic speckle interferometry defect detection based on carrier electronic speckle interferometry can be carried out simultaneously.<br>(2) By selecting a reasonable laser ultrasonic excitation source, the laser ultrasonic non-contact nondestructive testing and ultrasonic infrared thermal imaging testing of composite defects can be carried out simultaneously, which can meet the requirements of laser ultrasonic excitation source light power and ultrasonic infrared excitation source frequency.<br>(3) Based on the above conclusions, it is feasible to realize the simultaneous detection of complex defects in carbon fiber composites by combining laser ultrasonic, speckle interferometry and infrared thermal imaging.<br>In addition, the research shows that the application of terahertz time domain spectroscopy detection system can realize the identification and detection of defects related to carbon fiber composites<br>(1) Different defect samples have different structural characteristics at the defect, which leads to different refractive index and absorption coefficient of terahertz wave. Except for high temperature damage, the other three kinds of defect samples have absorption peaks at different positions. At the same time, the attenuation degree of terahertz time domain waveform amplitude and frequency domain frequency of defect samples meet the following requirements: hole defect > shock wave Defect > thermal damage > high temperature damage;<br>(2) Transmission and reflection modes were used to detect the defective PP and pp-lgf adhesive plates. The results show that the two-dimensional plane position information of the defect in the sample can be more accurately reflected by the imaging image in the transmission mode. In reflection mode, by selecting different reflection echo imaging methods, the image can reflect the three-dimensional depth information of the defect in the sample to a certain extent. At the same time, the reflection mode can show the micro wear defects on the surface of the bottom plate which are not obvious in the transmission imaging. By combining the two imaging modes, we can obtain more specific defect feature information of the tested samples.<br>