Laser spot thermography – scanning mode

Jakub Roemer

doi:10.21152/1750-9548.13.1.85

Abstract

The paper shows experimental results of fatigue crack detection, performed by laser spot thermography and vibrothermography techniques. The experiments were conducted on aluminium bar with artificially introduced crack. The paper contains theoretical background of both techniques. Also test setups including the control and signal processing software were presented and described. Semi-automatic algorithm for data processing was presented. The algorithm allows for automating measurement procedure, which limits the operator input. The paper shows that both laser spot thermography, as well as, vibrothermography can be effectively used for crack detection in metallic structures

Highlights

Non-destructive testing (NDT) is an essential part of almost all engineering applications with demand for robust and safe operation
The following paper shows the experimental results on laser spot thermography and vibrothermography
Laser spot thermography is a technique of active thermography, which utilizes laser radiation as a source of excitation [9,10,11,12,13,14]

Summary

INTRODUCTION

Non-destructive testing (NDT) is an essential part of almost all engineering applications with demand for robust and safe operation. There are many successfully implemented and utilized NDT techniques [7,8] in the industry. Many such techniques are first researched and developed in scientific laboratories, and afterwards gradually transferred to the market [1,2,3]. But still not widely used technique is laser thermography. Application of laser thermography shows promise mainly in automotive, aerospace, civil engineering, medical and space systems industries [4,5,6]. The following paper shows the experimental results on laser spot thermography and vibrothermography. The experimental tests were performed on an aluminium bar with present fatigue crack.

EXPERIMENTALLY TESTED SAMPLE

LASER SPOT THERMOGRAPHY

VIBROTHERMOGRAPHY

CONCLUSION