The Induced Polarization Method In Hydrology And Geophysical

The induced polarization method is proposed and implemented in Academy ofEngineering by the Central South University in China, which write by ProfessorJishan in1980s. It is only a geophysical field theory, put forward and the invented bythe Chinese people all over the country. It is a frequency geophysical explorationmethods. In a variety of mineral resources, hydrology, geology of engineering andprospecting electrical prospecting has become one of the most effective means ofexploration which cannot be replaced. In the field of archaeological, environmentaland geological disasters, the electrical method is an effective means of investigation.The induced polarization method has become a successful application in looking forland, water and mine.The paper outlines the development of induced polarization method and theapplication of the status quo and then makes a clear purpose and outlines thesignificance of this paper. After understanding of the physical mechanism of theinduced polarization method, the writer explores the basis of the basic principles andmethods of the induced polarization method, including the equivalence of time andfrequency, and then observing programs and observational parameters of the inducedpolarization method; the frequency characteristics of induced polarization and theconsideration of field works. On this basis, the writer first analysis the characteristicsof geological and geophysical in the work area; the attention in the field. Measuringthe deployment of network, working methods and then evaluate the quality of datacollection. After In-depth studying the process of induced polarization, the writer usethis method measure the area of11line processing. At the result the treatment is effect.Finally, the results detailed inference and interpretation. Although the basic workingprinciple of the induced polarization method is derived from the excitationintensification method, but with the traditional DC and AC induced polarizationmethod compared to the dual-frequency IP instrument has the following essentialadvantages:(1) It has the anti-interference ability. Dual-band signal receiver at thesame time. They suffered the same degree of interference and calculate the amplitudefrequency time, which interfering signals cancel each other; receiving power frequency; active filter, coherent detection; sampling points interfere with theformation of a strong repression;(2) It has small influent in some institution. Foreignconventional frequency conversion method instrument receives high-frequencysignals at different times, but the dual-band instrument receives at the same time nomatter in low-frequency signals or high-low-frequency signal.(3) It has highefficiency in observing. Because of the Dual-band supplying and detecting in thesame time, the speed of observing the instrument has more than four times faster thanthe variable frequency instrument of foreign traditional. Moreover a receiver couldtransmute data which suitable for large-area census prospecting;(4) It is lightweight,flexible. In order to getting the same exception to reflect the dual-frequency IP,instrument supply current is generally only require tens of hundreds of mill amperes.Only a few tenth of the time domain induced polarization instrument, which smallerthan foreign harmonic method with13harmonic law required supply current is13times. so you needn’t use Generator, instead of using the battery power. Thelightweight equipment is more suitable for work in the inaccessible and complexterrain in the mountains.(5) It is good stability, high accuracy of observations. Due todual-band simultaneous observations, the frequency made to be difference, but theimpact on the frequency changes little which in temperature, humidity and otherobservations. The instruments increase stability which less than0.2%generally.