变压器的维护至关重要。 变压器油中水含量的检测是变压器维护中很重要的一部分。 水在太赫兹频段独特的分子键振动模式使其对太赫兹波具有强烈的吸收性。 利用太赫兹时域光谱技术对变压器油进行水含量检测, 获得了不同水含量变压器油的吸收系数和折射率, 结合相关理论模型对获得的参数进行了分析验证。 试验结果表明, 变压器油的吸收系数和折射率与水含量呈线性关系。

The maintenance of the transformer is more and more important and the analysis of moisture content in transformer oil has become a very important part of transformer maintenance. Water is known as a strong absorber for THz radiation due to its distinctive intermolecular vibration in this frequency range. In the present work, we analyzed transformer oils regarding their water content by THz spectroscopy. Based on THz time-domain spectroscopy, information about the absorption coefficient and the refractive index of the oil samples is provided. By comparing the results with relevant theories we demonstrate that both the absorption coefficient and the refractive index are linearly related to the concentration of water in the oil solutions.