Laser ultrasonic detection system and method for carbon fiber braided composite material

Abstract

The invention discloses a laser ultrasonic detection system and method for a carbon fiber braided composite material. A pulse laser beam emitted by a pulse laser generates a laser ultrasonic signal onthe surface of the to-be-detected carbon fiber braided composite material; a linear array type air coupling laser ultrasonic probe receives laser ultrasonic signals generated on the surface of the linear array type air coupling laser ultrasonic probe in a preset phase control focusing mode; the light absorptivity of the surface structure of the to-be-measured carbon fiber braided composite material and the laser ultrasonic signal attenuation amplitude of the internal structure of the to-be-measured carbon fiber braided composite material are calculated; the light absorptivity is compared witha preset light absorptivity threshold value; image representation is performed on the surface structure defects of the to-be-detected carbon fiber braided composite material according to a comparisonresult; and the laser ultrasonic signal attenuation amplitude is compared with a preset laser ultrasonic signal attenuation threshold value, and image representation is performed on the internal structure defects of the to-be-detected carbon fiber braided composite material according to the comparison result so that the objective of micron-scale precision detection of the surface and internal structure defects of the to-be-detected flat plate type material can be realized.

Description

technical field [0001] The present application relates to the technical field of laser ultrasonic testing, in particular to a laser ultrasonic testing system applied to carbon fiber braided composite materials and a corresponding testing method. Background technique [0002] Carbon fiber braided composites are widely used in civil industrial manufacturing, aerospace and military industries due to their excellent structural properties. Since the carbon fiber woven composite material has many components, the material has anisotropy, and the process is also very complicated, this puts forward new requirements for the quality inspection of the carbon fiber woven composite material in the production stage. [0003] At present, how to solve the interference and detection efficiency of the complex micro-surface structure of the carbon fiber composite plate on the detection system, and simultaneously obtain high-resolution surface microstructure and internal deep defects has become ...

AI Technical Summary

Problems solved by technology

[0005] This application provides a laser ultrasonic testing system and method for carbon fiber braided composite materials, which are used to solve the problem of insufficient comprehensive detection of structural defects of carbon fiber braided composite materials in the production stage in the prior art, low detection efficiency, large volume, high cost and Technical issues with lower accuracy

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