4.8 Article

A Miniaturized Active Thermography System to Inspect Composite Laminates

Journal

IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
Volume 17, Issue 5, Pages 3314-3323

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TII.2020.3030619

Keywords

Active thermography; composite materials; degradation assessment; in situ inspection; miniaturization; nondestructive testing (NDT)

Funding

  1. Lloyd's Register Foundation [GA\100113]
  2. U.K. EPSRC Platform Grant: Through-life performance: From Science to Instrumentation [EP/P027121/1]

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This article introduces a miniaturized active thermography system for assessing defects in composite laminates. The system features a small size, low resolution, and low cost thermal sensor, and integrates two optional excitation sources. Dedicated data analysis approaches are proposed to effectively evaluate different types of defects.
With the rapid increase of the integration and complexity of industrial components, the inaccessibility and inapplicability of existing nondestructive testing devices have become a bottleneck for in situ inspection of these objects. This article introduces a miniaturized active thermography system featured with a small-size, low-resolution, and low-cost thermal sensor, where two optional excitation sources including flash and laser are integrated. Dedicated data analysis approaches to evaluate defects are proposed considering the degraded signal quality. Three carbon fiber-reinforced polymer laminates with a variety of defects are evaluated quantitatively and qualitatively using the proposed system by comparing with two existing non-miniaturized inspection systems. The results show that the proposed system can work effectively for the degradation assessment of composite laminates. Even with the technical limitations that affect the detectability, for instance, the low pixel resolution, this technique will play an important role to inspect components featured with geometrically intricate space.

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