Molecular Spectroscopy With a Compact 557-GHz Heterodyne Receiver
| Autor: | Viktor Krozer, Jan Stake, Huan Zhao, Aik-Yean Tang, Heiko Richter, Tom K. Johansen, Heinz-Wilhelm Hübers, Anders Emrich, Johanna Hanning, Peter Sobis, Vladimir Drakinskiy, Tomas Bryllert, Axel Hulsmann, Philipp Neumaier |
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| Přispěvatelé: | Publica |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Heterodyne
Materials science Absorption spectroscopy Superheterodyne receiver heterodyne receiver Heterostructure barrier varactor 7. Clean energy law.invention terahertz law CH(3)OH heterostructure barrier varactors Schottky diode Electrical and Electronic Engineering MMICs methanol Noise temperature Radiation Spectrometer Sideband business.industry Amplifier Electrical engineering mHEMT molecular spectroscopy Optoelectronics power amplifiers business |
| DOI: | 10.1109/tthz.2014.2326554 |
| Popis: | We report on a heterodyne terahertz spectrometer based on a fully integrated 557-GHz receiver and a digital fast Fourier transform spectrometer. The receiver consists of a chain of multipliers and power amplifiers, followed by a heterostructure barrier varactor tripler that subharmonically pumps a membrane GaAs Schottky diode mixer. All sub-components are newly developed and optimized with regard to the overall receiver performance such as noise temperature, power consumption, weight and physical size. The receiver works at room temperature, has a double sideband noise temperature as low as 2000 K at a maximum power consumption of 4.5 W with an Allan time of 10 s and a sideband gain ratio of 0.52. The performance of the spectrometer is demonstrated by absorption spectroscopy of H(2)O and CH(3)OH with an instantaneous bandwidth of 1.5 GHz and a resolution of 183 kHz. Several pressure broadening parameters of methanol absorption lines were determined, that agree with other published data. Using the experimentally determined molecular parameters the CH(3)OH absorption spectrum could be modeled with very high precision. |
| Databáze: | OpenAIRE |
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