Detection and Characterization of Defects in Isotropic and Anisotropic Structures Using Lockin Thermography
| Autor: | Philipp Myrach, Mathias Röllig, Rainer Krankenhagen, Henrik Steinfurth, Christiane Maierhofer |
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| Rok vydání: | 2015 |
| Předmět: |
lateral resolution
Materials science business.industry amplitude images Isotropy non-destructive testing lockin thermography Carbon Fiber Reinforced Plastic (CFRP) Fibre-reinforced plastic Computer Graphics and Computer-Aided Design Characterization (materials science) Optics Amplitude Signal-to-Noise Ratio (SNR) Nondestructive testing Thermography Radiology Nuclear Medicine and imaging steel Computer Vision and Pattern Recognition phase images Electrical and Electronic Engineering Anisotropy business Image resolution |
| Zdroj: | Journal of Imaging Volume 1 Issue 1 Pages 220-248 |
| ISSN: | 2313-433X |
| Popis: | Lockin thermography is a well-suited method for the characterization of structures made of both metal and fiber reinforced plastic. In most cases, only phase images are analyzed, although the amplitude images might contain useful information as well. Thus, systematic studies of lockin thermography are presented, assessing amplitude and phase images for the detection and quantification of defects in isotropic (steel) and anisotropic (carbon fiber reinforced plastic) materials. Characterized defects are flat bottom holes with different diameters and various remaining wall thicknesses as well as crossed notches at different depths. The excitation frequency was varied while keeping the number of analyzed excitation periods nearly constant for each material. The data analysis was focused on the detectability of the defects both in the amplitude and phase images, including the determination of the signal-to-noise ratio and of the spatial resolution. As a result, the limits of defect detectability and spatial resolution are given for each material. |
| Databáze: | OpenAIRE |
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