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太赫兹时域光谱技术可以分辨化合物结构上的微小差异并应用于物质检测与分析,为有机化工产品的鉴别及更宽有效光谱区的测试提供了新的实验方法.本文运用太赫兹时域光谱技术研究了甲醇、防冻液和刹车油在太赫兹波段的光学特性,在室温氮气环境中,得到了样品的时域谱和在0.2～2.5THz波段的吸收谱.甲醇和防冻液、刹车油在此波段的吸收谱存在显著差异,甲醇的吸收峰位于0.35THz、0.72THz处,防冻液和刹车油的主要吸收峰位于0.62THz处.实验表明,用太赫兹时域光谱技术可以检测防冻液和刹车油里是否掺有甲醇,进而判断其质量的优劣.
The terahertz time-domain spectroscopy can distinguish small differences in chemical structure and apply to the detection and analysis of materials, which provides a new experimental method for the identification of organic chemical products and the wider and more effective spectral region.This paper uses terahertz time-domain spectroscopy The optical properties of methanol, antifreeze and brake oil in the terahertz range were studied and the time-domain spectra and absorption spectra in the range of 0.2-2.5THz were obtained at room temperature in a nitrogen atmosphere. Methanol and antifreeze, The absorption bands of this band are significantly different, the absorption peak of methanol is located at 0.35THz, 0.72THz, the main absorption peak of antifreeze and brake oil is located at 0.62THz.The experimental results show that using terahertz time-domain spectroscopy can detect the antifreeze and Brake oil is mixed with methanol, and then judge the merits of its quality.