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Proceedings Paper

Dynamic measurements at THz frequencies with a fast rotary delay line
Author(s): Hichem Guerboukha; Andrey Markov; Hang Qu; Maksim Skorobogatiy
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Paper Abstract

Fabrication, characterization, and applications of a fast rotary linear optical delay line (FRLODL) for THz time-domain spectroscopy are presented. The FRLODL features two reflective surfaces with spatially separated incoming and outgoing beams. It has been manufactured using CNC machining. A linear dependence of the optical delay on the rotation angle allows a straightforward extraction of the conversion factor between the acquisition time (in ms) and the terahertz pulse time (in ps). The FRLODL has been tested using rotation speeds of up to 48 Hz, corresponding to an acquisition rate of up to 192 Hz with four blades incorporated on the same disk. At high speeds we observe a decrease of the bandwidth due to the limitations of the electronics, in particular, the transimpedance amplifier. An error analysis is performed by experimentally evaluating the signal-to-noise ratio and the dynamic range. With regard to the applications of the FRLODL, we first present observation of the evaporation of liquids, namely water, acetone and methanol. We then demonstrate monitoring of the spray painting process. Finally, detection of fast moving objects at 1 m/s and their thickness characterization are presented.

Paper Details

Date Published: 25 February 2016
PDF: 10 pages
Proc. SPIE 9747, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX, 97470R (25 February 2016); doi: 10.1117/12.2216308
Show Author Affiliations
Hichem Guerboukha, Ecole Polytechnique de Montréal (Canada)
Andrey Markov, Ecole Polytechnique de Montreal (Canada)
Hang Qu, Ecole Polytechnique de Montréal (Canada)
Maksim Skorobogatiy, Ecole Polytechnique de Montréal (Canada)

Published in SPIE Proceedings Vol. 9747:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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