Study on the development of the in-situ measuring method of soil moisture and contamination by using the dielectric constant measurement.

近年来，以土壤污染和地下水污染为代表的地面环境问题已成为全国各地普遍存在的问题，如何方便、准确地测量土壤的污染水平，对评价污染物在地下的行为、改善污染土壤具有重要意义。但在该方法中，目前采用取样法作为土壤污染程度的测量方法，实际上是奇点法，难以把握土壤污染就地随时间变化的程度。然后，在本研究中，为了使现有的FDR-V测量方法成为调查土壤污染程度的设备，首先，通过实验室测试来掌握基本的物理性质，在本财政年度继续由现有的FDR-V设备来发展成为现场测量系统。然后，针对现有设备的缺陷，研制了频率多或少损耗低的现场测量型设备，并研究了现场测量随时间变化的污染水平的方法。对系统的数据采集系统和标定方法进行了研究，以使现有的FDR-V测量装置能够进行更精确的测量，具体地说，保持了电缆噪声的损失，测量探头可以断开，并将其改进为系统，以实现快速的数据采集。针对现有设备的缺陷，提出了价格便宜、以频率或小场测量为损耗的设备。测量频率测量结果常规100MHz ~ 3GHz。然后，通过对现场测量噪声产生因素的检测和电缆极限长度的检测等，验证了现场测量随时间变化的污染程度的方法的有效性，并建立了噪声的去除方法。利用新旧2型FDR-V测量装置对几种土壤样品、污染物进行了室内测量，以掌握材料复介电常数特性作为测量依据。研究了在地下注入不同于水的液体，通过介电常数的变化来测量地面有效孔隙率的方法。少

Recently, though ground environmental problem represented for soil pollution and ground water pollution becomes a problem in national each place, it is important to conveniently and accurately measure the pollution level of the soil in order to evaluate the behavior of the pollutant in the underground, and in order to improve polluted soil. However, in this method, the method for taking sample as a measuring method of pollution level of the soil at present actually is the singularity, and it is difficult to grasp the time-dependent change degree of soil pollution in situ. Then, in this study, in making FDR-V measurement method of the possession to be investigation equipment degree of soil pollution at present, to begin with, a grasp of basic physical property by laboratory test was continued by the FDR-V equipment of the possession in this fiscal year in order to made to develop into measurement system in situ, at present. Then, the equipment of cheap loss by the frequency more or litt … More le field measurement type was developed based on the defect of the existing equipment, and the method for measuring the change of time-dependent pollution level in situ was studied.Data collection system and calibration method of the system were examined in order to enable the more exact measurement for FDR-V measuring device ever possessed, concretely, the loss of the noise by the cable was held, and the disconnection of the measurement probe was possible, and it improved it into the system for the rapid deta acquisition. Based on the defect of the existing equipment, it was cheap, and the equipment of loss by the frequency or little field measurement type was developed. Measuring frequency measurement result conventional 100MHz〜3GHz. Then, the usefulness was confirmed by carrying out examination of the generating factor of the noise in the field measurement and examination of limitative length of the cable, etc. in order to examine the method for measuring the change of time-dependent pollution level in situ, and establishing the removal method of the noise.The measurement in the indoor was carried out using the FDR-V measuring device of new and old 2 for several kinds soil sample of, pollutant in order to grasp the material complex permittivity characteristic as a basis of the measurement. The technique which measured the effective porosity of the ground from the change of the dielectric constant by injecting the liquid unlike the water in the ground, was examined. Less