Large Capacity Underground Data Collection, Storage And Analysis System

In this paper, we have resolve means to measure pressure inoil well depth And this means is successful apply to measure pressure in oil well.Because position of collection signal located in oil well under ground surface 1400m. Collection data is not now sent to PC. Scheme that data is now stored in oil well is adopt so that decrease cost of scheme. We have design Collection circuit who is mainly made up of FLASH MEMORY-28f128 And AD-μC812 . Collection data is stored in FLASH MEMORY -28F128 that is made by Intel. chip that is used to collection data is ADμC812 who is producted by analog Corp . ADμC812 have fellow characteristic: it has 12 bit a/d and 2 entries d/a of 12bit;It is easy for ADμC812 interface to 28F128 .Pressure sensor that was choose is piezoelectricity sensor. It is good at dynamic characteristic, quickly response.Data that is collected and stored in FLASH MEMORY is send to pc with USB Interface and parallel port .Two kinds of interface are meet request about sending speed.We have do data analysis work . It is mainly work for our to show pressure signal , observe peak value of signal and compute signal power spectram .while we have conceive that used wavelet transform to distill pressure signal characteristic .