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Environmental damages such as the detachment of original surfaces caused by cavity formation under the surface of natural stone and ceramic objects are usually not externally visible. Envirromental influences as temperature and humidity fluctuations, particularly when frost or saline accumulation forms can result in the generation of cracks, gaps, and even full detachment of parts of artwork in the...
The feasibility of THz time-domain spectroscopy for monitoring the leaf water content of plants has been shown in earlier publications. Here, we present extensive measurement series on different plant species. Our measurements show that the behavior of a plant under drought stress is a complex process that is controlled by physiological processes inside the plant. Thus, the loss of water from a leaf...
We demonstrate how water status measurements on plants can be performed using terahertz quasi time domain spectroscopy (THz QTDS). Compared with conventional THz TDS, this approach enables much more cost-efficient measurement setups and thus brings the technology closer to it's application in the field. Exemplary data is obtained from examining the drought stress response of rye and soy.
We use reflection THz spectroscopy to produce three-dimensional images of air gaps between stones that resemble fractures of sub-wavelength thicknesses.
Understanding the interactions of the crystalline and the amorphous domains in semi-crystalline polymers, such as HDPE or PVDF, is a subject of ongoing research. Here, we apply terahertz time-domain spectroscopy to study the impact of the glass transition taking place in the amorphous phase on lattice modes associated with the crystalline domains.
We present a time domain and a frequency domain based algorithm for the analysis of spectroscopic terahertz data. The thickness information as well as the frequency dependent complex material parameters are extracted. Both methods can evaluate data obtained from measurements on sub-100mum thick samples, even in case of overlapping Fabry Perot echoes in the time domain. While the frequency domain approach...
An electromagnetic model of plant leaves at THz frequencies is presented. It allows for the determination of the leaf water status. The model bases on an effective medium theory and extends the model by Landau, Lifshitz, and Looyenga. The influence of scattering, which is dominant at higher frequencies, is described by a Rayleigh roughness factor. Results of THz time-domain spectroscopy measurements...
This paper deals with the analysis of a GTEM cell in time domain by introducing a linear time invariant (LTI) system theoretical approach. This approach accounts for the corresponding impulse responses relating the feeding port signal to any vector field quantity at arbitrary positions within the cell. The investigations are conducted for a large GTEM cell by evaluating its simulated EM field when...
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