Research On Seismic Acquisition Technology With Single Point

Seismic acquisition system is the first step to receive the information of earthquake.And it is the core of the equipment in seismic exploration.With the constant innovation and development of seismic exploration instruments,the requirement of low noise and high accuracy is increasing as also.This paper studies a single point of land seismic prospecting exploration acquisition technique.This paper use ?-?(Delta—Sigma)ADC technology and Multi-stage cascade-type signal conditioning amplifier circuit.The accuracy of signal acquisition is expected to improve and the noise is effectively suppressed.This paper mainly completed the following work:First,in this paper,the principle of data acquisition and single-point seismic exploration acquisition technology theory is discoursed.A single point of stationary seismic acquisition system is analyzed.The system's main components,including A/D converter,microprocessor and serial interface chip have made a reasonable selection,and it also makes a brief introduction.Second,the hardware circuit of the seismic acquisition system is designed.In this system,the hardware circuit mainly includes preamplifier circuit,analog-to-digital conversion circuit,main control circuit,peripheral circuit module and serial communication circuit.Preamplifier circuit of the acquisition system using instrumentation amplifier,filter amplifier and isolation amplifier three amplifier cascade manner.Signal acquisition using TI's recommended ADS 1255 analog to digital conversion chip for seismic exploration,which is 24 bit ?-? precision analog-digital conversion chip.TMS320F2812 of TI Company is used as a master chip and CH375 of USB which is producted by Nanjing Qin Heng Ltd is used as the serial chip.Third,based on the function for the need of seismic acquisition system expected to realize,it also designs the software part.Visual C++ is used as the PC's software development platform.It can be programmed interactive interface.CCS of TI's DSP development environment is used as the lower computer software development platform to program.C language is used for programming.In this paper,the system initialization procedure,the design modulus acquisition and control program have been completed and it implements the acquisition and control of the signal acquisition.All the procedures are carried out to debugging and running,which have achieved the desired results.Fourth,the data obtained by the building seismic acquisition system have been tested and analyzed and the expected effect is achieved.After simulation,the test result shows that the collected signal have a good effect and data acquisition and transmission are correct.