油气水界面问题一直受到该领域研究人员的普遍关注和重视。在本文中, 采用太赫兹光谱技术研究了厚度分别为 1 mm和 0.5 mm的样品池中油气水的光谱性质并讨论了界面处的频域谱特性。结果表明, 在煤油和水构成的界面处不产生双峰响应, 但是单峰的延迟时间随着位置的移动发生规律性的变化; 在煤油和空气构成的界面处时域谱出现双峰响应, 频谱产生振荡现象, 且当太赫兹测试点中心接触油气界面时振荡现象最显著, 而后逐渐消失。样品池厚度较小时, 频谱振荡现象有所减弱。结果表明太赫兹技术可作为一项安全的测试手段, 用于石油输运过程中油气界面的表征。

The issue of oil-gas-water interface has attracted much attention in the oil industry. The spectral characteristics and optical properties of oil-gas-water interfaces of the sample cells with the thicknesses of 1 mm and 0.5 mm are investigated respectively by using the Terahertz-Time Domain Spectroscopy(THz-TDS). Bimodal response is observed at the kerosene-gas interface. When the THz-TDS is transformed to Terahertz Frequency Domain Spectra(THz-FDS), an oscillation effect is obtained. The oscillation phenomenon will be the most significant when the test center arrives at the kerosene-gas interface. Besides, the oscillation phenomenon in THz-FDS attenuates with the decreasing of the sample cell’s thickness. Such oscillation phenomenon will not appear in the THz-FDS for kerosene-water interface. Results indicate that THz spectroscopy can be used as a secure method to characterize the oil-gas-water interface in the transportation process of petroleum.