Fig. 7: Reflection measurement data and model of a 23 µm PET foil.
From: Optoelectronic frequency-modulated continuous-wave terahertz spectroscopy with 4 THz bandwidth
a Time-domain representation of the THz signal reflected from a single-layer PET foil with a nominal thickness of 23 µm (blue) and corresponding model function (orange) used for thickness determination. Details on the model function can be found in the “Methods” section. b Spectral amplitude and phase of the measured data and model function. For these measurements, individual spectra were averaged ten times, which corresponds to an acquisition time of less than 0.2 s.
