The Exploration On The Microseismic Data Acquisition Instrument Based On DSP

Coal is base energy in our country. It takes an important action in our national economy. But now the situation of safety production for coalliery is rather critical. Many catastrophes could have been controlled, 40 percent of which are evocative because of roof coal fallen-down, gas-outthrust and flooding. And these reasons are related with cover rock fracturing raised by the redistribution of stress.Microseismic monitoring technology is geophysical survey new technology , whose range and prospect are much expansive . It can be used in three band monitoring , monitoring coalliery gas overflow , forecasting and preventing from leakage of top and bottom plate. Microseismic monitoring system is exploited on the basis of the above technology. Technicians can observe and research the spacial destructive regularity of coalliery working plane; realize the analysis and localization of microearthquake event. This has grand signification for coalliery safety production.What the thesis introduced the design of data acquisition, which is important composition of the system. It expounds several ring-joints in detail. Data acquisition is the basis of microseismic monitoring, whose demands for hardware is very high. Firstly, the thesis studies the characteristic of seismic wave and discusses the selection of geophone? Secondly,it introduces the design of preamplification circuit, which amplifies the signal and fulfill low pass filter; the thesis put emphasis on the design of DSP system:hardware design includes minimum DSP system and peripheral interface circuits(ADC and communication interface circuit) ; software design fullfils mainly data acquisition, data transmission and filter of 50Hz.