天然电场选频法日变规律观测试验

The Observation and Test of the Daily Variation Based on the Frequency Selection Method of Natural Electric Field

为探寻不同地区天然电场选频法一次场的来源,深入了解大地电磁场的日变规律,对不同环境下的天然电磁场开展了同点同时观测、异点同时观测和日变规律试验观测。通过对试验数据的分析对比发现,工业园区夜间电位曲线变化明显比白天更加平缓;而城镇和山区的日变曲线在夜间用电高峰期有一个较大的起伏,并且在雷电活动期间山区的曲线存在明显波动。结果表明,工业园区工作场源主要为工业游散电流,城镇和山区则主要受居民用电和雷电影响,其日常变化均服从各自的日变规律。

In order to find out the source of the primary field of the frequency selection method natural electric field in different regions and to deeply understand the diurnal variation law of magneto-telluric field,this paper has carried out simultaneous observations of the natural electromagnetic field at the same point in different environments,and simultaneous observation of different points and experimental observation of diurnal variation law.Through the analysis and comparison of the experimental data,it is found that the nocturnal curve change of the industrial park is more gentle than that of the daytime.The diurnal variation curve of town and mountain area has a big fluctuation during the peak period of power consumption at night,and the curve of mountain area has obvious fluctuation during the lightning activity.Results show that the main source of the industrial park is the industrial stray current,while the towns and mountain areas are mainly affected by the residents’electricity and lightning,and their daily changes obey their own daily variation law.