Laser Thermography: An Investigation of Test Parameters on Detection and Quantitative Assessment in a Finite Crack

Abstract

This preliminary study investigates the influence of test parameters on the detection and quantitative assessment of cracks using laser thermography. Cracks pose significant material design and analysis concerns, compromising the structural strength and durability of structures. Traditional crack detection methods have limitations, motivating the exploration of laser thermography. A finite element model (FEM) was developed and validated using finite thickness and surface cracks. Experimental tests were conducted, and the relative position between the laser spot and crack was investigated. The results showed the potential influence of the laser spot size and position on the crack detectability. This research contributes to advancing crack detection using non-destructive laser thermography techniques.

Keywords

• crack detection
• flying spot laser thermography
• non-destructive technique (NDT)
• FEM model
• thermography