Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 5 of 5 for “"Gas spectroscopy"”.
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Novel Applications of Terahertz Quantum Cascade Lasers: Gas Spectroscopy, Active Control & Nearfield Imaging
… to astronomical applications, imaging, and spectroscopy because of their high output power and narrow spectral linewidth. In this work, three techniques, self-mixing gas spectroscopy, THz amplitude modulation and THz nearfield imaging, will be experimentally studied and demonstrated. These …
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Optically Pumped Type-II Mid-Infrared Tunable Distributed Feedback Lasers
… for applications such as remote sensing or spectroscopy in the 3 to 5 μm midwave-infrared range of atmospheric transmission window. In the demonstration of this type of laser, a hyperbolically chirped grating was patterned using interferometric lithography (IL) with spherical wavefronts …
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Terahertz Time Domain Spectroscopy of Anisotropic Systems: techniques, analysis and applications
<p>The method of terahertz time domain spectroscopy (THz-TDS) allows determination of the broadband electromagnetic response of materials over a typical spectral region of 0.3 to 3 THz. Past work in this field has generally been dominated by the investigation of isotropic materials and the …
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Thermophony in real gases
… model of thermophonic sound generation in real gases has been developed. The model is experimentally validated in a frequency range from 2 kHz to 1 MHz by testing more then fifty thermophones of different materials, including Carbon nano-wires, Titanium, Indium-Tin-Oxide, different sizes and …
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Broadband Terahertz Signal Generation and Radiation Based on Direct Digital-to-Impulse Radiating Arrays in Silicon
… and detection is widely used in THz time-domain spectroscopy systems. Although THz-TDS is a powerful technique, its dependence on bulky, expensive and power-hungry femtosecond lasers, optomechanical components, and costly photoconductive antennas compromises its speed, accessibility and …