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调味料的太赫兹时域光谱

发表时间:2012-02-15  浏览量:1153  下载量:500
全部作者: 杨晨,赵昆,田璐,尼浩,苗青
作者单位: 中国石油大学(北京)理学院
摘 要: 实验利用太赫兹时域光谱(terahertz time-domain spectroscopy,THz-TDS)技术对调味料样品进行检测,得出淀粉、冰糖、红糖、苏打、食盐和味精样品在太赫兹波段的时域光谱数据。经过快速傅里叶变换(fast Fourier transform,FFT)和其他运算之后,得到调味料样品的吸收谱和折射率谱。结果表明:样品的吸收谱在0.2~2.0 THz频段内各不相同,并且呈现出特征吸收峰。计算折射率谱得出样品的平均折射率在1.83~2.98之间,并且折射率谱在其吸收峰所对应的频率处出现了反常色散。对吸收系数的峰值位置以及折射率进行定标分析,说明THz-TDS技术可以用于不同种调味料的定性检测。实验数据为调味料的鉴别提供了依据,可以用于建立调味料的太赫兹波谱数据库。
关 键 词: 光学;太赫兹;太赫兹时域光谱;调味料
Title: Terahertz time-domain spectroscopy of seasonings
Author: YANG Chen, ZHAO Kun, TIAN Lu, NI Hao, MIAO Qing
Organization: College of Science, China University of Petroleum (Beijing)
Abstract: In this paper, the optical property and spectroscopy of seasonings were studied based on the terahertz time-domain spectroscopy (THz-TDS). By applying a numerical fast Fourier transform (FFT), the optical constants of starch, crystal sugar, brown sugar, soda, salt and monosodium glutamate were calculated. The absorption spectra of samples in 0.2~2.0 THz are different and show their characteristic absorption peaks. The refractive indices of samples present anomalous dispersion. And it suggests that the resonance process is related with optical absorption, which also exhibits absorption peaks similar to those in the curve of absorption coefficient. Experiment demonstrates that THz-TDS technology can be used for the qualitative analysis of different kinds of seasonings according to their spectral features. And the results can be used to establish the fingerprint database of seasonings.
Key words: optics; terahertz; terahertz time-domain spectroscopy; seasoning
发表期数: 2012年2月第3期
引用格式: 杨晨,赵昆,田璐,等. 调味料的太赫兹时域光谱[J]. 中国科技论文在线精品论文,2012,5(3):208-211.
 
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