基于小波变换的油水混合物时域介电谱分析

Analysis of Oil-water Mixture Using Time Domain Dielectric Spectroscopy Based on Wavelet Transform

目前的时域介电谱法主要用于分析稀薄液体或分子有序体组成的物质,需要被分析物质内部各个驰豫过程互不相关,或者可以进行线性叠加。但是对于复杂的多相混合物,应用传统的时域介电谱方法具有一定局限性。为了扩宽时域介电谱的应用范围,本文提出了基于小波变换改进时域介电谱的分析方法。通过对油水混合物驰豫过程分析的实验结果表明,基于小波变换的时域介电谱分析不但可以给出混合物性的整体频谱信息,还能得到各个组成成分的不同时域和频域信息,可用于分析不同油区的油水混合物。

At present, the time domain dielectric spectroscopy （TDS） is mainly used to analyse the thin liquid or the substances composed with molecular orderly body. The various relaxation processes desired during using the method are unrelated one another or could be superposable linearly. But the application of traditional TDS is restrained for the analysis of complex heterogeneous mixture. In order to widen its scope of application, an improved method was proposed based on wavelet transform. Through the analysis of the relaxation process of oil-water mixture, the experimental results show that the time domain dielectric spectroscopy based on wavelet transform can exhibit the whole spectrum information of mixture and obtain the various component information in time and frequency domains. Therefore, the TDS＇ method based on wavelet transform can be used for analying oil-water mixture in different oil fields.