Inspection of composite structures using line scanning thermography

Obdulia Ley; Manny Butera; Valery Godinez

doi:10.1117/12.919176

18 May 2012 Inspection of composite structures using line scanning thermography

Obdulia Ley, Manny Butera, Valery Godinez

Proceedings Volume 8354, Thermosense: Thermal Infrared Applications XXXIV; 835406 (2012) https://doi.org/10.1117/12.919176
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

This work deals with the non destructive analysis of different composite parts and structures using Line Scanning Thermography (LST), a non-contact inspection method based in dynamic thermography. The LST technique provides a quick and efficient methodology to scan wide areas rapidly; the technique has been used on the inspection of composite propellers, sandwich panels, motor case tubes and wind turbine blades, among others. In LST a line heat source is used to thermally excite the surface under study while an infrared detector records the transient surface temperature variation of the heated region. Line Scanning Thermography (LST), has successfully been applied to determine the thickness of metallic plates and to assess boiler tube thinning. In this paper the LST protocols developed for the detection of sub-surface defects in different composite materials commonly used in aerospace applications, plates will be presented. In most cases the thermal images acquired using LST will be compared with ultrasonic c-scans. The fundamentals of LST will be discussed, as well as the limitations of this technique for NDT inspection.

Citation Download Citation

Obdulia Ley, Manny Butera, and Valery Godinez "Inspection of composite structures using line scanning thermography", Proc. SPIE 8354, Thermosense: Thermal Infrared Applications XXXIV, 835406 (18 May 2012); https://doi.org/10.1117/12.919176

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