Infrared thermal wave radar imaging nondestructive testing method and system for defects of carbon fiber reinforced plastic (CFRP) plywood

Abstract

The invention discloses an infrared thermal wave radar imaging nondestructive testing method and an infrared thermal wave radar imaging nondestructive testing system for defects of a carbon fiber reinforced plastic (CFRP) plywood. The method comprises the following steps: adjusting space positions of a laser light source beam expanding and shaping device and a to-be-tested sample, so that the laser evenly irradiates the surface of the sample; controlling a data collection card to generate a linear frequency modulation pulse signal; driving a laser powder driver, so that the power of an optical fiber laser device changes according to the law of the linear frequency modulation pulse signal; collecting a thermal wave radar signal on the surface of the to-be-tested CFRP sample; processing the collected surface thermal wave radar signal; extracting time and frequency domain feature information of the thermal wave radar signal; extracting characteristic parameter of internal defects of the sample by treatment and analysis of the characteristic information images, so as to achieve nondestructive testing of the internal defects and damages of the sample. The system comprises an optical fiber laser device, a laser power driver, a data collection card, a laser light source beam expanding and shaping device, a focal plane infrared thermal imager and a computer. By adopting the method and the system, the defects of the CFRP plywood are quickly and accurately detected.

Description

technical field [0001] The invention relates to a method and a system for realizing the nondestructive detection of CFRP laminate defects by using an active infrared thermal wave detection means, in particular to an infrared thermal wave radar imaging nondestructive detection method and system. Background technique [0002] With the rapid development of material science and industrial testing technology, non-destructive testing technology has become one of the necessary means to ensure product quality. Carbon Fiber Reinforced Polymer / Plastic (CFRP) is a new type of material developed in recent decades and is widely used in aerospace, automobile, shipbuilding and other fields. Carbon fiber reinforced composite materials are prone to various defects and damages during the molding and use process. At present, the conventional non-destructive testing techniques for CFRP laminate defects mainly include radiographic testing (RT), ultrasonic testing (UT) and electromagnetic testing...

AI Technical Summary

Problems solved by technology

Infrared phase-locked thermal wave nondestructive testing technology is one of the most widely used infrared thermal wave nondestructive testing technologies at present. This technology can overcome the shortcomings of uneven heating and slow detection speed. , it is necessary to select an appropriate modulation frequency, otherwise there will be missed detection of internal defects

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