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首页> 外文期刊>Applied optics >Method for improving terahertz band absorption spectrum measurement accuracy using noncontact sample thickness measurement
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Method for improving terahertz band absorption spectrum measurement accuracy using noncontact sample thickness measurement

机译：利用非接触样品厚度测量提高太赫兹带吸收光谱测量精度的方法

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摘要

The terahertz absorption spectrum has a complex nonlinear relationship with sample thickness, which is normally measured mechanically with limited accuracy. As a result, the terahertz absorption spectrum is usually determined incorrectly. In this paper, an iterative algorithm is proposed to accurately determine sample thickness. This algorithm is independent of the initial value used and results in convergent calculations. Precision in sample thickness can be improved up to 0.1 (mu)m. A more precise absorption spectrum can then be extracted. By comparing the proposed method with the traditional method based on mechanical thickness measurements, quantitative analysis experiments on a three-component amino acid mixture shows that the global error decreased from 0.0338 to 0.0301.
机译：太赫兹吸收光谱与样品厚度具有复杂的非线性关系，通常以机械方式以有限的精度进行测量。结果，太赫兹吸收光谱通常被错误地确定。本文提出了一种迭代算法来精确确定样品厚度。该算法与所使用的初始值无关，并且导致收敛的计算。样品厚度的精度可以提高到0.1μm。然后可以提取更精确的吸收光谱。通过将提出的方法与基于机械厚度测量的传统方法进行比较，对三组分氨基酸混合物进行的定量分析实验表明，全局误差从0.0338降低至0.0301。

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