Design And Implementation Of AD Sampling System Of Logging System

As the high resolution ratio of oil, rock and water, the dielectric logging system which can measure the dielectric constant is a more practical and effective way in the petroleum logging system. At present, the foreign dielectric logging system has the technology blockade to China. In order to break the blockade of foreign technology, the data acquisition system is studied and implemented in this paper.This paper mainly is mainly aimed at AD collection system, first of all, the process is that analog information will be turned into digital information after the acquisition of data with ads1274. Secondly, ad data will be read out with EP3C25E144 , which are able to suppress the noise and enhance the information correlation,through the EP3C25E144 smooth;finally, the smoothed data through the SPI communication protocol pass to the next level.FPGA has the parallel processing ability, which can speed up the processing speed of the system. For the overall arrangement of this paper is divided into:The system design of this paper is divided into two parts, namely, hardware system design and software system design.Hardware parts of the AD sampling system are introduced, which include ADS1274 design, FPGA design in EP3C25E144C8, power supply design.In the ADS1274 ,the level differential circuit design, FPGA AS configuration circuit, filter circuit and level conversion design are also included .The AD sampling system software section includes the AD acquisition system,smoothing the FPGA, FPGA data transmission process .Finally, on the basis of software and hardware, the joint test of hardware and software is given under the RS232 and oscilloscope platform,which is proved that the design is feasible.