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Terahertz measurement techniques reveal a high potential for non-destructive and contactless thickness determination of thin-coated plastics, ceramics, paper and tablets as well as painted car bodies. While for these applications the thickness is measured at the end of the complete coating process, we here investigate the suitability of this technique in order to determinate the thickness immediately...
Nowadays, aircrafts and cars are coated with several layers of coating. Hence, demands for thickness monitoring of each individual layer within a multi-layer coating system are rising. Industrially established techniques for coating thickness control have limits when analyzing multi-layer systems. Terahertz technology using time-domain spectroscopy with a time-of-flight-measurement principle has shown...
We present a novel miniature module for terahertz attenuated total reflection spectroscopy. It is made of high resistivity silicon by applying free form optics fabrication and features two parabolic surfaces which act as the sensitive interfaces. Fiber coupling of highly integrated emitter and detector chips provides a high degree of flexibility.
We have fabricated a new photoconductive antenna based on a transverse electromagnetic horn and low temperature grown GaAs. It has been tested with a time-domain terahertz setup. The horn was used as the emitter and a standard dipole photoconductive antenna was used as the receiver. The spectrum covers the 0.2–2 THz range with good signal/noise ratio.
We present a pulsed terahertz imaging system with a line focus intended to speed up measurements. A balanced 1-D detection scheme working with two industrial line cameras is used. The instrumental characteristics are determined.
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