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Automotive coating plays an important role in car industry. They protect the car bodies from various aggressive weathering and mechanical deformations. Though many techniques have been developed for car coating, there is still a demand for non-destructive characterization of multilayer coatings. Therefore, research on new measurement methods is still ongoing. In this paper, we investigate thin coating...
We present a highly accurate self-calibrating approach to investigate ceramic thermal barrier coatings on metallic substrates using terahertz (THz) technique in reflection geometry. The proposed approach enables the simultaneous determination of the complex refractive index and the coating thickness. Hence, a pre-calibration of the specimen under test is not required.
We have measured stress distributions in ceramic thermal barrier coatings using reflection-based polariscopes working at GHz and THz frequencies. Such coatings are routinely used in aerospace, automotive and energy applications. Understanding stress distributions within these coatings during manufacture and after use is vital to improving their performance. Stress optic coefficient measurements of...
This work describes the design and characterization of the Calibration Hot Load that is applied in the Submillimetre Wave Instrument on-board the Jupiter and Icy Moons Explorer satellite of the European Space Agency. The dielectric properties of the cold temperature suitable coating material 2850FT have been investigated within the desired bandwidth between 560 GHz and 620 GHz. Numerical calculations...
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...
Terahertz in-line sensing was successfully demonstrated on a production scale setting for measuring the coating thickness of individual pharmaceutical tablets during the film coating process. This paper reports on our recent research progress to combine terahertz in-line sensing, optical coherence tomography and numerical modelling in a lab scale setting to better understand the pharmaceutical film...
Time of flight Terahertz imaging deserves huge attention in a wide range of applications, among which artwork diagnostic, food quality control, composite material assessment and so on. In all these contexts, the common requirement is to obtain high quality images from which one can infer material structure and localize hidden anomalies. Here, we apply a filtering procedure, which exploits the concept...
PTB applied a novel thin-film pyroelectric detector in an international pilot comparison on THz power measurement below 1 THz. Due to its spectrally flat response, this detector is suitable for accurate absolute TDS power measurements and as reference material for TDS transmission and reflection measurements as well.
Terahertz reflective imaging is applied to characterize the damage mechanisms in the coating on metal substrate after aging. THz frequency-wavelet deconvolution is designed to resolve the overlapping echoes due to the optically thin coating. With the decovolved THz data, different types of damages including corrosion, blisters and delamination are characterized quantitatively in three dimensions.
Field emitters are attractive for use in diagnostic gyrotrons destined for the DNP/NMR spectroscopy. They should provide durable work of the gyrotrons at currents more than 20–30 mA. The paper demonstrates prospects of the use of the developed by the authors multi-tip silicon emitters with metal — fullerene coatings for this application.
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