Quality control systems in industry can benefit from the new possibilities offered by the THz frequency range. THz
imaging systems can complement actual quality control systems and at the same time offer new information about
products, improving quality and reducing costs. In this case we have implemented an imaging system to control the
evolution of water content in leaves. The work presented in this paper shows the water content evolution of leaves in the
range from 0.14 THz to 0.22 THz. Transmission and reflection parameters have been measured obtaining frequency and
time domain information. While in the visible region the leaf is still green after 48 hours of cutting, and no appreciable
change can be seen, in the THz image more than 5dB variation can be obtained due to the loss of water in the leaf. As a
conclusion, it can be said that imaging in active THz technology can be used to measure the evolution of water content in
leafs at the early stage of drying, where no changes are noticeable in the visible region. Agriculture quality control
systems could benefit from this technology.
A Thz spectral characterization of the behaviour of different explosives is presented in this paper. This characterization
will be done in the frequency range from 20 GHz to 4 THz using a Teraview Spectra 3000. This system has a capacity of
measuring from 20 GHz to 4 THz fed by a laser source. With the Teraview Spectra 3000 equipment will be possible to
calculate the refractive index, the absorbance and other important parameters of the explosive samples. With this study it
will be possible to characterize some of the most common used explosives, i.e., gun explosive, gunpowder mine, pent,
TNT, RDX, etc, and it will allow to determine their electromagnetic peculiarities in order to design a future imaging
system that allow detecting them in security and defense sectors.
The THz range offers the possibility of measuring water content. This can be useful in wine industry to
control plants water levels and also to decrease irrigation costs. This paper presents a THz imaging
system used to characterise water content in leaves using frequency and time domain methods from 0.14
to 0.22 THz. Our results show the possibility of getting useful information out of the preformed
measurements.
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