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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 spectrum of the remote part of the PWM_1.5 signal (a) and Reference signal spectrum (b) in the frequency range ν = [0.6, 2.4] THz; integral characteristics CW_p,P(t_n) detecting the frequencies ν = 0.78 THz (a1); 0.84 THz (b1); 1.95 THz (a2); 2.19 THz (b2).