Development Of Portable Transient Electromagnetic Receiver

Transient Electromagnetic methods (TEM) can be called as Time Domain Electromagnetic methods, is the detection of subsurface electrical parameters of such an important method of information, now in mineral exploration, drilling, aviation and marine areas have been widely applied.Chapter 1 of the paper describes the basic principles of TEM and TEM receiver in history, current situation and my research ideas. From the current development trend of domestic and foreign, transient electromagnetic apparatus is moving in high integration, high-power, low power, high accuracy, data processing and mapping automation and data interpretation intelligent direction. It is in this atmosphere, Geology and Prospecting Center with the development of new instruments relevant to the purpose of work, to cooperate with my unit, research and development of portable electromagnetic receiver. 2009, by the China University of Geosciences (Beijing) responsible for the development of portable electromagnetic receiver, has now completed the development and testing. This system, band up to 200kHz more than 110dB dynamic range can be achieved.Chapter 2 and chapter 3 of the paper are about the receiver hardware and software design process. As to transient electromagnetic signal with characters of a large amplitude at early stage high-speed decaying and a small amplitude at midterm or later period slow-speed decaying, we present one design based on transient electro-magnetic receiver based on ARM9 unit. To acquire ultra and high dynamic range signal intelligently, designed data acquire broad based on Linux and ARM9, developed the Linux drivers for data acquire broad under Linux 2.4 kernel. And in order to expand the frequency range of detector and increase the accuracy, we use high accuracy ADC-ADS1274.With the ARM9 MCU, we develop the driver and application program of ADS1274 and PC program for data processing.Chapter 4 of the paper is the experiment part, is divided into indoor model experiment and the field experiment. The testing of receptivity is kept through the testing of noise level and receptivity of transient lector-magnetic signal, and the experimental results were analyzed in detail. After the design, debugging and system testing, the design of the receiver to achieve the desired goals and actual testing in the field, made the application effect is satisfactory. The results indicate that the equipment has the good stability and the usability.Chapter 5 of the paper is the conclusion, a summary of the text and made several suggestions, in the hope of the future relevant peer a little inspiration.