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Journal of Spectroscopy
Volume 2017 (2017), Article ID 2134868, 6 pages
Research Article

Terahertz Spectroscopy and Brewster Angle Reflection Imaging of Acoustic Tiles

1Department of Physics, University of Northern British Columbia, Prince George, BC, Canada V2N 4Z9
2Department of Physics, University of Alberta, Edmonton, AB, Canada T6G 2E1

Correspondence should be addressed to Patrick Kilcullen

Received 10 November 2016; Accepted 5 January 2017; Published 8 March 2017

Academic Editor: Arnaud Cuisset

Copyright © 2017 Patrick Kilcullen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A Brewster angle reflection imaging apparatus is demonstrated which is capable of detecting hidden water-filled voids in a rubber tile sample. This imaging application simulates a real-world hull inspection problem for Royal Canadian Navy Victoria-class submarines. The tile samples represent a challenging imaging application due to their large refractive index and absorption coefficient. With a rubber transmission window at approximately 80 GHz, terahertz (THz) sensing methods have shown promise for probing these structures in the laboratory. Operating at Brewster’s angle allows for the typically strong front surface reflection to be minimized while also conveniently making the method insensitive to air-filled voids. Using a broadband THz time-domain waveform imaging system (THz-TDS), we demonstrate satisfactory imaging and detection of water-filled voids without complicated signal processing. Optical properties of the tile samples at low THz frequencies are also reported.