Analyzing the dynamic thermal behavior of a structure and detection of defects by using periodic binary sequences
Faculty of Applied Engineering Sciences
OPTICAL MEASUREMENT TECHNIQUES FOR STRUCTURES & SYSTEMS2 (OPTIMESS2012)
5th International Conference on Optical Measurement Techniques for, Structures and Systems2 (OPTIMESS), APR 04-05, 2012, Antwerp, BELGIUM
, p. 53-61
University of Antwerp
The pulse phase thermography, abbreviated as PPT, is one of the best up-and-coming active thermographical techniques. In this contribution, the pulse phase thermography technique combined with the use of "Discrete Interval Binary Sequences" (abbreviated as DIBS-signal) as an input signal for the heat source is used to localize defects in a part made of a multi-layer material. The use of a DIBS-signal as an input signal for the heat source has been investigated and the impact on the final results compared to the classical pulsed approach, which is the most common approach, will be shown. It will be demonstrated that the use of a DIBS-signal is a promising technique, due to its higher signal-to-noise ratio. Although there are some minor issues, an enhanced image processing technique will be proposed to solve them and improve the resolution. The use of a DIBS-signal leads to some issues that had to be answered before proceeding. In order to do so, a sample made of Carbon Fibre Reinforced Plastic (CFRP) with a few flat bottom holes has been analysed and some results are discussed in this article. The whole concept is developed to be an important asset to investigate the healthiness of structures or objects, which are made of this lightweight material.