4 November 2010 Reflective mode terahertz time domain spectroscopy for sealed liquid detection
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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.
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Zhen-Wei Zhang, Kai-Jun Mu, Liang-Liang Zhang, Cun-Lin Zhang, "Reflective mode terahertz time domain spectroscopy for sealed liquid detection", Proc. SPIE 7854, Infrared, Millimeter Wave, and Terahertz Technologies, 78541F (4 November 2010); doi: 10.1117/12.870441; https://doi.org/10.1117/12.870441
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