Development Of DC-induced Polarization Receiver

Electrical survey is based on various types of crustal rocks or ore bodies in the electromagnetic properties of (such as conductivity, permeability, dielectric) and electrochemical properties of the difference, by artificial or natural electric field, electromagnetic field or electrochemical field in space distribution and time characteristics of the observation and research to find different types of deposits and the identification of a useful geological and geophysical exploration to solve geological problems approach. Used to find metals, non-metallic deposits, exploration of groundwater resources and energy to solve some of the engineering geology and deep geological problems. Polarization method is different rocks, minerals IP effect of the difference of material, by means of observation of the earth to probe IP effect a branch of geology underground electrical, in playing an important role in the investigation. The application of induced polarization method has become increasingly widespread, in addition to looking for copper deposits outside, looking for iron (Shanxi-style iron ore, manganese ore deposit types, iron silicon mirror), looking for coal (coal mines small and shallow, buried coal mine outside , semi-concealed coal field), looking for lead-zinc in ultrabasic rocks to find nickel-chromium ore and gold are all looking to achieve - the set of geological effects. Overseas, the induced polarization survey in the mineral exploration and play an important role, and found some large low-grade sulfide ore body (other geophysical methods is difficult to work in). Exploration in the polarization, high power transmitters and high-sensitivity receiver, back-end data processing unit constitutes the basic unit of polarization. The study of this thesis is highly sensitive receiver made it possible for devices to portable, automatic, memory, multi-parameter measurement direction.Based on the above background, the paper, through research, analysis of domestic and international IP law and IP law instrument technology development and present situation of the development of DC polarization receiver this topic. The main objective of this subject is Texas Instruments (TI)'s Cortex-M3 core-based ARM LM3S9B92 as a master device, using SD (Secure Digital) card as a data storage unit that can store data in accordance with the papers a long time to facilitate management; USB as a data transmission unit, than the traditional RS232 communication easier; anti-disturbance mainly 50HZ notch filter, switched capacitor filters, digital filter technology combination to improve anti-jamming capability; data collection using 24-bit high accuracy AD converter, to improve the measurement accuracy; signal conditioning unit with a programmable amplifier unit, the natural potential compensation unit, edge detection unit, which increase the range and test equipment to meet the maximum measurement environment provides a reliable guarantee. Geological conductors by measuring the transmitter excitation signal generated by the voltage calculated as the polarizabilities for the data processing unit to provide the necessary data.In this thesis, the completion of the work: First, according to the basic principles of induced polarization method and the characteristics of the receiver system design. Complete system schematic, PCB design and welded debugging; second, the completion of commissioning of each module and the basic driver programming; the third to complete the calculation of susceptibility as well as software preparation. Finalize the overall debugging equipment to achieve the object of design.