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. 2015 May 25;15(6):12103–12132. doi: 10.3390/s150612103

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© 2015 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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Fourier spectra of the PWM_40 signal (a) and Reference (b), calculated in the time interval t = [70, 170] ps, integral characteristics CW_p,P(t_n) detecting the frequencies ν = 0.9 THz (c); 1.96 THz (d); 2.17 THz (e).