调味料的太赫兹时域光谱.doc

文档介绍：
调味料的太赫兹时域光谱
杨晨,赵昆,田璐,尼浩,苗青**
(中国石油大学(北京)理学院,北京 102249)
5
10
15
20
25
30
35
40
摘要:实验利用太赫兹时域光谱(THz-TDS)技术对调味料样品进行检测。经过快速傅里叶
变换(FFT),得出淀粉、白糖、红糖、苏打、食盐和味精样品在太赫兹波段的光谱数据。
样品的吸收谱在 - 频段内各不相同并且呈现出特征吸收峰。样品的平均折射率在
- 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,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;太赫兹时域光谱;调味料
中图分类号:
Terahertz Time-domain Spectroscopy of Seasonings
YANG Chen, ZHAO Kun, TIAN Lu, NI Hao, MIAO Qing
(College of Science, China University of Petroleum, Beijing 102249)
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 have been calculated. The absorption spectra of samples in -2THz are
different and show their characteristic absorption peaks. The refractive indices of samples appear
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 th