25 February 2016 Terahertz imaging of composite materials in reflection and transmission mode with a time-domain spectroscopy system
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Abstract
A fiber-coupled Terahertz time domain spectroscopy (THz-TDS) system based on photoconductive antennas, pumped by a 100-fs fiber laser, has been used to characterize materials in transmission and reflection mode. THz images are acquired by mounting the samples under investigation on an x-y stage, which is stepped through the beam while the transmitted or reflected THz waveform is captured. The samples include a carbon fiber epoxy composite and a sandwich-structured composite panel with an aramid fiber honeycomb core in between two skin layers of fiberglass reinforced plastic. The former has an artificially induced void, and from a comparison of recorded reflected time-domain signals, with and without the void, a simple model for the structure of the composite is proposed that describes the time-domain signals reasonably well.
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Trygve R. Sørgård, Trygve R. Sørgård, Arthur D. van Rheenen, Arthur D. van Rheenen, Magnus W. Haakestad, Magnus W. Haakestad, "Terahertz imaging of composite materials in reflection and transmission mode with a time-domain spectroscopy system", Proc. SPIE 9747, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX, 974714 (25 February 2016); doi: 10.1117/12.2217726; https://doi.org/10.1117/12.2217726
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