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Schematic diagram of the transmission measurement of the THz-TDS. A plastic bottle containing a liquid sample is placed in the path of the THz wave.
THz transmittance of the plastic bottles. Inset: temporal behavior of the THz pulse transmitted through air, the PET bottles with and without a plastic label.
THz transmittance of the liquids stored in the PE bottle (a) and the PET bottle (b).
THz absorption spectra of inflammable liquids in the PET bottles.
Refractive indices of the inflammable liquids and pure hydrocarbon solvents.
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