Uncertainty in Terahertz Time-Domain Spectroscopy Measurement of Liquids
Uncertainty in Terahertz Time-Domain Spectroscopy Measurement of Liquids
复制标题
液体太赫兹时域光谱测量的不确定度
DOI：
10.1007/s10762-016-0318-1
复制
发表时间：
2017-02-01
影响因子：
2.9
通讯作者：
Zhang, Fang
中科院分区：
文献类型：
--
作者：
Yang, Fei;Liu, Liping;Zhang, Fang
太赫兹时域光谱（THz-TDS）是表征材料的重要技术，因为它可以快速和宽带测量太赫兹区域的光学常数。复杂的测量过程和数据处理严重影响了常数的测量精度。结合液体的THz透过率测量，分析了THz TDS过程中存在的误差来源。在THz-TDS过程中的光学常数的不确定性的贡献的各个源的公式，特别强调的多层反射和平面波假设的影响。因此，提出了一个分析模型，在液体的THz-TDS测量的不确定度评估。对邻苯二甲酸二异辛酯（DEHP）样品的实际测量表明，该模型可作为评价液体光学常数测量精度的依据。
Terahertz time-domain spectroscopy (THz-TDS) is a significant technique for characterizing materials as it allows fast and broadband measurement of optical constants in the THz regime. The measurement precision of the constants is highly influenced by the complicated measurement procedure and data processing. Taking THz transmission measurement of liquids into account, the sources of error existing in THz-TDS process are identified. The contributions of each source to the uncertainty of optical constants in THz-TDS process are formulated, with particular emphasis on the effect of multilayer reflections and plane wave assumption. As a consequence, an analytical model is proposed for uncertainty evaluation in a THz-TDS measurement of liquids. An actual experiment with a Di 2-Ethyl Hexyl Phthalate (DEHP) sample is carried out to show that the proposed model could be a basis to evaluate the measurement precision of optical constants of liquids.