Electrical and optical characteristics of water under high electric stress
Electrical and optical characteristics of water under high electric stress
复制标题
DOI：
10.1109/modsym.2002.1189516
复制
发表时间：
2002-06
期刊：
影响因子：
--
通讯作者：
Sunao Katsuki;Ravindra P. Joshi;M. Laroussi;F. Leipold;K. Schoenbach
中科院分区：
文献类型：
--
作者：
Sunao Katsuki;Ravindra P. Joshi;M. Laroussi;F. Leipold;K. Schoenbach
为了确定水在高电压下的电特性，我们测量了电阻率为 200 k/spl Omega/cm、电场强度高达 1 MV/cm 的蒸馏水的电流-电场 (I-E) 特性。 1.7mm直径球体和平面不锈钢电极之间的间隙在50/spl mu/m至400/spl mu/m之间变化。由 50 /spl Omega/Blumlein 发生器提供的持续时间为 200 ns、幅度高达 40 kV 的电压脉冲被施加到电极上。此外，使用激光纹影法和马赫-曾德尔干涉仪，以一纳秒的时间分辨率测量了高电压下蒸馏水折射率的变化。当电场超过 500 kV/cm 时，电流的增加呈超线性。这符合极性液体的一般 I-E 特性。在平均电场高达 1 MV/cm 的情况下进行的光学测量表明，作为阳极的球形电极的表面出现了一层折射率降低的层。即使在电压脉冲结束后也可以观察到条纹的移动。这可能表明施加电压后水的成分发生变化。
In order to determine the electrical characteristics of water under high electric stress, we have measured the current-electric field (I-E) characteristics of distilled water with a resistivity of 200 k/spl Omega/cm, up to electric field intensities of 1 MV/cm. The gap between a 1.7 mm diameter sphere and a plane stainless steel electrodes was varied between 50 /spl mu/m to 400 /spl mu/m. Voltage pulses with duration of 200 ns and amplitude of up to 40 kV, provided by a 50 /spl Omega/ Blumlein generator, were applied to the electrodes. In addition, measurements of changes in the index of refraction of distilled water under high electric stress were performed, using laser Schlieren method and Mach-Zehnder interferometry with a temporal resolution of one nanosecond. With the electric fields in excess of 500 kV/cm the increase in the current was found to be super linear. This is in accordance with the general I-E characteristics for polar liquids. Optical measurements at average electric fields of up to 1 MV/cm revealed that a layer with decreased index of refraction emerges from the surface of the spherical electrode, which serves as anode. Shifting of the fringes is observed even after the voltage pulse ends. This might be an indication of change in composition of water after voltage applications.