Flash Lamp Heat Flux Requirements For Thermographic Inspection Of Fiber Composite Laminates

S. D. Cowell; D. D. Burleigh; T. J. Murray

doi:10.1117/12.953401

21 March 1989 Flash Lamp Heat Flux Requirements For Thermographic Inspection Of Fiber Composite Laminates

S. D. Cowell, D. D. Burleigh, T. J. Murray

Proceedings Volume 1094, Thermosense XI: Intl Conf on Thermal Infrared Sensing for Diagnostics and Control; (1989) https://doi.org/10.1117/12.953401
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States

Abstract

A numerical approximation was used to determine the ability of a thermographic imaging camera to detect defects in a panel of graphite epoxy composite while excitation is provided by a specific, commercially available high-energy pulsed xenon flash lamp capable of repetitive pulses of 600 J each. A three-dimensional mathematical model was developed, which simulated the composite panel. The panel consisted of eight plies and included implanted circular defects. Defects modeled included delaminations, overlaps, and teflon inserts. During the first second of the simulation, six heat pulses of 0.2 msec duration were applied to the front surface of the sample. Temperature variations appear on the rear surface of the sample due to the presence of defects inside the panel, which cause the heat to diffuse through the sample at modified rates. A minimum temperature difference of 0.18 °F (0.1 °C) was detectable by the thermal imaging camera. The purpose of this study was to determine whether the purchase of a xenon flash lamp system was warranted for thermographic nondestructive testing (NDT) on graphite epoxy laminates.

Citation Download Citation

S. D. Cowell, D. D. Burleigh, and T. J. Murray "Flash Lamp Heat Flux Requirements For Thermographic Inspection Of Fiber Composite Laminates", Proc. SPIE 1094, Thermosense XI: Intl Conf on Thermal Infrared Sensing for Diagnostics and Control, (21 March 1989); https://doi.org/10.1117/12.953401

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