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	Restoration of terahertz signals distorted by atmospheric water vapor absorption
	Wang, Yingxin ; Chen, Zhiqiang ; Zhao, Ziran ; Zhang, Li ; Kang, Kejun ; Zhang, Yan
	2010-10-12 ; 2010-10-12
关键词	rotational states terahertz wave spectra water TIME-DOMAIN SPECTROSCOPY RANGE THZ Physics, Applied
中文摘要	Terahertz spectroscopic measurements under ordinary atmospheric conditions may suffer interferences from water vapor absorption in the ambient air. A manifold of narrow absorption lines appears in the terahertz spectrum at particular frequencies corresponding to the pure rotational transitions of water molecules. For real-world data, such effect results in unwanted spectral artifacts in the deconvolved spectrum of the examined sample and thus complicates its frequency-dependent characterization. In this paper we use a signal postprocessing algorithm consisting of line shape fitting and spectral subtraction procedures to eliminate the water lines. Restoration of terahertz signals from simulated data and low-humidity measurements is first demonstrated to validate the algorithm. Furthermore, to overcome the difficulty of eliminating strong lines which lead to possible excessive absorption under high-humidity environment, we propose to modify the objective function in spectral subtraction by smoothing the residual spectrum to get acceptable performance.
语种	英语 ; 英语
出版者	AMER INST PHYSICS ; MELVILLE ; CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/78784]
专题	清华大学
推荐引用方式 GB/T 7714	Wang, Yingxin,Chen, Zhiqiang,Zhao, Ziran,et al. Restoration of terahertz signals distorted by atmospheric water vapor absorption[J],2010, 2010.
APA	Wang, Yingxin,Chen, Zhiqiang,Zhao, Ziran,Zhang, Li,Kang, Kejun,&Zhang, Yan.(2010).Restoration of terahertz signals distorted by atmospheric water vapor absorption..
MLA	Wang, Yingxin,et al."Restoration of terahertz signals distorted by atmospheric water vapor absorption".(2010).

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