2种电阻率法污染探测装置的抗噪声性能比较

Comparison of Anti-Noise Performance Using Wenner and Dipole-Dipole Arrays in Pollution Survey

为比较2种电阻率法污染场地探测装置——温纳和偶极装置的抗噪声性能,基于点电流源电场分布原理进行理论推导,研究了理想均匀半空间的理论电位取值,并在重庆一废弃化工厂进行实际场地探测比较.结果表明,采用相同极距的2种探测装置,温纳装置采集的信号强度为偶极装置的3倍以上,具有更强的在抗噪声性能.在实际探测中,温纳装置仅有0.28%的数据由于数据质量较差被移除,而偶极装置的这一数据占12.10%,可见温纳装置比偶极装置具有更好的抗噪声性能.因此,在实际污染场地探测中,如果场地的噪声干扰严重,应优先选择采用温纳装置进行探测.

To compare the anti-noise performance of the wenner array with that of the dipole-dipole array using the electrical resistivity,the potential distributions of the two arrays in the homogeneous space were derived based on the basic electric field principles of the point current source.The ratio was set to 3∶1 for the signal strength of the wenner（alpha） to the dipole-dipole when the n factor in the dipole-dipole array was set as 1.The ratio would be even larger,when greater n values were used.A field survey was carried out in a contaminated site.The results showed that 12.10% of the data collected by the dipole-dipole array were removed,while the percentage was only 0.28% in the wenner array according to the repeat error and data value when a larger factor n was used that results in the noisy data.By analyzing the data collected by the two arrays,it is concluded that the dataset of the wenner array can be superior to that of the dipole-dipole array.Consequently,the wenner array should be applied if the background noise is high in the actual contaminated sites survey.