Measurement of mixtures of melamine using THz ray

Ye Cui; Kaijun Mu; Xinke Wang; Yan Zhang; Cunlin Zhang

doi:10.1117/12.835293

4 August 2009 Measurement of mixtures of melamine using THz ray

Ye Cui, Kaijun Mu, Xinke Wang, Yan Zhang, Cunlin Zhang

Proceedings Volume 7385, International Symposium on Photoelectronic Detection and Imaging 2009: Terahertz and High Energy Radiation Detection Technologies and Applications; 73851E (2009) https://doi.org/10.1117/12.835293
Event: International Symposium on Photoelectronic Detection and Imaging 2009, 2009, Beijing, China

Abstract

The terahertz spectra of pure melamine and two kinds of its mixtures that mix with polyethylene and milk powder were measured using the terahertz time-domain-spectroscopy (THz-TDS). It was found that there are two absorption peaks at 1.99THz and 2.29THz in all three spectra. The absorption coefficient of the mixture varies with the proportion of melamine in the mixture. Increasing the percentage of melamine in the mixture, the absorption peaks in spectrum get more obvious and sharper. According to the Lambert-Beer law, the absorption coefficient and the proportion of the melamine should followed linear relationship. The experimental data accord to this theory well. Using density functional theory, the vibration of melamine crystal was calculated, which accords to experimental data well. This work provides a method of detecting melamine in milk powders. It is expected that the terahertz spectroscopy technology can be used in food safety and other applications.

Citation Download Citation

Ye Cui, Kaijun Mu, Xinke Wang, Yan Zhang, and Cunlin Zhang "Measurement of mixtures of melamine using THz ray", Proc. SPIE 7385, International Symposium on Photoelectronic Detection and Imaging 2009: Terahertz and High Energy Radiation Detection Technologies and Applications, 73851E (4 August 2009); https://doi.org/10.1117/12.835293

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