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In this paper, a novel quality-monitor method of inkjet-printed electronics based on terahertz (THz) sensing is presented. Specifically, two different approaches, namely THz reflection spectroscopy and THz near-field scanning, are proposed.
Inkjet-printed electronics are showing promising potential in practical applications, but methods for real-time, non-contact monitoring of printing quality are lacking. This work explores Terahertz (THz) sensing as an approach for such monitoring. It is demonstrated that alterations in the localised dielectric characteristics of inkjet-printed electronics can be qualitatively distinguished using quasi-optically-based,...
A sub-Terahertz circular dichroism spectrometer is developed and built based on a vector network analyzer driven quasi-optical system at 220–325 GHz sub-THz frequency domain (VNA-CD). The main goal is to explore the potentially significant absorption features in THz signatures of aqueous protein samples.
Here we explore a technique for constraining physical properties of near-Earth asteroids (NEAs) based on variability in thermal emission as a function of viewing aspect. We present case studies of the low albedo, near-Earth asteroids (285263) 1998 QE2 and (175706) 1996 FG3. The Near-Earth Asteroid Thermal Model (NEATM) is used to fit signatures of thermal emission in near-infrared (0.8 - 2.5 µm)...
Terahertz time domain spectroscopy (THz-TDS) was used to study the transmission responses of pH-dependent apomyoglobin (ApoMb) dissolved solutions in 0.2–2.2 THz frequency domain, the THz-TDS technique was also benchmarked against circular dichroism (CD) by studying pH-related folding states changes of ApoMb protein. Results revealed that differences of pH-dependent ApoMb/water dynamics can be detected...
The versatility for quasi-optical circuits, driven by modern vector network analysers, is demonstrated for the purpose of low energy (meV) coherent spectroscopy. One such example is shown applied to the curing dynamics of a non-mercury-based dental cement. This highlights the special place the methodology holds as a ‘soft-probe’ to reveal the time-resolved energetics of condensed phased systems as...
There are some sources of uncertainty and misunderstanding in the process of material parameter extraction by THz Time Domain Spectrometry (THz-TDS) that are not initially evident. This paper aims to analyze the most common mistakes in interpreting THz-TDS measurements. Experimental evidence is shown where relevant.
Tunable Diode Laser Absorption Spectroscopy (TDLAS) can offer significant opportunities and advantages for in-situ measurements of multiple parameters in gas dynamic and combustion flows. In this paper, with regard to Rocket Based Combined Cycle (RBCC), which is hydrocarbon combustion environments over the temperature range 1000-2500K, three beams diode laser sensor based on Direct Absorption Spectroscopy...
In preliminary work, a millimeter-wave vector network analyzer is used to analyze pectate lyase and a sequenced concentration of glucose solutions. Data reveal concentration-dependant spectra for glucose and Ca2+-sensitive spectra for pectate lyase.
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