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Proceedings Paper

Reflective mode terahertz time domain spectroscopy for sealed liquid detection
Author(s): Zhen-Wei Zhang; Kai-Jun Mu; Liang-Liang Zhang; Cun-Lin Zhang
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Paper Abstract

We built a reflective mode terahertz time domain spectroscopy system for sealed liquid detection. We used air plasma THz emitter for obtaining a high THz power of 5mW and used ZnTe electro-optic (EO) sampling for getting high sensitivity difference detection. Experiment demonstrates this system can detect the liquid in the sealed container. We measured the reflection data on the second interface between the sealed container and the inside liquid. The signals from the top interface show a relation with the refraction coefficients of the liquid in the THz region by using Fresnel's equations. The liquid can be indentified by comparing the curves of reflection and a database of known liquid refraction coefficients. In this paper, water, ethanol and ethylene glycol were detected and indentified. In additional, the data processing and analysis for getting the reflection data on the second interface are discussed.

Paper Details

Date Published: 4 November 2010
PDF: 7 pages
Proc. SPIE 7854, Infrared, Millimeter Wave, and Terahertz Technologies, 78541F (4 November 2010); doi: 10.1117/12.870441
Show Author Affiliations
Zhen-Wei Zhang, Capital Normal Univ. (China)
Kai-Jun Mu, Capital Normal Univ. (China)
Liang-Liang Zhang, Capital Normal Univ. (China)
Cun-Lin Zhang, Capital Normal Univ. (China)

Published in SPIE Proceedings Vol. 7854:
Infrared, Millimeter Wave, and Terahertz Technologies
Cunlin Zhang; Xi-Cheng Zhang; Peter H. Siegel; Li He; Sheng-Cai Shi, Editor(s)

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