P5 - Determining the Dimension of Subsurface Defect by Active IR - Experimental Research
- Event
- AMA Conferences 2017
2017-05-30 - 2017-06-01
Nürnberg, Germany - Band
- Proceedings IRS² 2017
- Chapter
- IP - Poster Session
- Author(s)
- S. Gryś - Czestochowa University of Technology (Poland)
- Pages
- 822 - 825
- DOI
- 10.5162/irs2017/iP5
- ISBN
- 978-3-9816876-4-4
- Price
- free
Abstract
This paper presents research on method of processing thermal images for detecting and characterizing material defects or nonuniformities in the internal structure of material. An active thermography was chosen as a NDT method. The hidden defects were revealed by analysis of temperature field of the front surface of tested material that was externally excited with heating lamps. The background removal and image segmentation were applied to the last thermogram from the sequence of thermogram recorded at the end of the heating phase. The paper focuses on accuracy of determination of transversal dimension of the subsurface flaws in Plexiglas slab with drilled bottom holes imitating the defects. The following factors influencing accuracy are taken into account: defect depth, the emissivity of the surface inspected as input parameter being set by user to the IR camera, the type of filtering used to remove an effect of the non-uniformity of heating the object surface with incandescent lamp.