Terahertz imaging of composite materials in reflection and transmission mode with a time-domain spectroscopy system

Trygve R. Sørgård; Arthur D. van Rheenen; Magnus W. Haakestad

doi:10.1117/12.2217726

25 February 2016 Terahertz imaging of composite materials in reflection and transmission mode with a time-domain spectroscopy system

Trygve R. Sørgård, Arthur D. van Rheenen, Magnus W. Haakestad

Author Affiliations +

Proceedings Volume 9747, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX; 974714 (2016) https://doi.org/10.1117/12.2217726
Event: SPIE OPTO, 2016, San Francisco, California, United States

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.

Citation Download Citation

Trygve R. Sørgård, Arthur D. van Rheenen, and 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); https://doi.org/10.1117/12.2217726

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