A Contactless Liquor Level Detection Method Using Terahertz Time-Domain Spectroscopy

Figure 5

The influence of dewdrop phenomenon: (a) dewdrop phenomenon on the PE film’s inside, (b) THz time-domain spectra for 20 times repeated measurements with dewdrops of the PE film, (c) comparison of peak terahertz signal intensity between dry and dewy PE films, and (d) comparison of peak position between dry and dewy PE films.

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(b)

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