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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Investigation on THz EM Wave Scattering From Oil-Covered Sea Surface: Exploration for an Approach to Probe the Thickness of Oil Film
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Investigation on THz EM Wave Scattering From Oil-Covered Sea Surface: Exploration for an Approach to Probe the Thickness of Oil Film

机译：从油覆盖海面散射散射的调查：探测油膜厚度的探索

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摘要

In this article, a theoretical study is carried out to seek an approach to remotely measure the thickness of the oil film. It is known that it is difficult to probe the oil thickness using a microwave radar due to the fact the dielectric constant of oil is very small compared with seawater for microwave frequencies. While in the range of terahertz (THz) electromagnetic (EM) wave frequency, the dielectric constants of oil and seawater are comparable, resulting in the THz EM fields scattered from the air-oil interface and those from the oil-water interface can produce constructive and destructive interference with the variation in the oil film thickness. Based on this principle, the sensitivity of the THz EM wave to the oil thickness is investigated in this work. First, the oil-seawater two-layer medium is equivalent to a single-layer medium by an equivalent dielectric constant model. Then, the THz EM scattering from the oil-covered sea surface is simulated using the first-order small slope approximation method (SSA-1) and the obtained equivalent dielectric constant. Meanwhile, the influences caused by the damping effect of the oil film, the reduction for friction velocity, and the change in equivalent permittivity on the normalized radar cross section (NRCS) are analyzed. The numerical results show that the NRCSs of THz frequencies are more sensitive to the change in oil thickness than that of microwave frequencies. This property makes the THz EM wave have the potential to probe the thickness of the oil film.
机译：在本文中，进行了理论研究，以寻求远程测量油膜厚度的方法。众所周知，由于对微波频率的海水相比，使用微波雷达难以使用微波雷达探测油厚度。虽然在太赫兹（THz）电磁（EM）波浪频率的范围内，但油和海水的介电常数是可比的，导致从空气油界面散射的THZ EM场，来自油水界面的那些可以产生建设性和破坏性干扰油膜厚度的变化。基于该原理，在这项工作中研究了THz EM波对油厚度的灵敏度。首先，通过等同的介电常数模型等于单层介质的油海水两层介质。然后，使用一阶小斜坡近似方法（SSA-1）和所获得的等效介电常数模拟来自油覆盖的海面的THz EM散射。同时，分析了由油膜的阻尼效果引起的影响，对摩擦速度的降低以及标准化雷达横截面（NRC）的等效介电常数的变化。数值结果表明，THz频率的NRC对油厚度的变化比微波频率更敏感。该特性使THz EM波有可能探测油膜的厚度。

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