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《Chinese Journal of Scientific Instrument》 2003-03
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Low-cut Filters in High Resolution Seismic Data Acquisition System

Yuan Zilong Zhuang Hongyan (Daqing Petroleum Institute,Daqing 163318,China)  
Low cut filters (LCF) with relatively high cut off frequency used in high resolution seismic data acquisition system give rise to the high frequency signal by attenuating its low frequency portion in its passing band. This paper has set up a relation among cut off frequency f 0,order n of LCF and wave velocity V,the minimum resolvable thickness Δh, and the absorption and attenuation factor A of Earth's strata. The thinner the resolvable layer needed, the higher the cut off frequency and order of LCF are required, and this will result in narrowing the passing band make it difficult for recognition of thin layer. The LCF used for improving resolution has traded off the energy and signal to noise ratio of seismic signal, thus makes it impossible to resolve less than 5 meters thick strata in mid and deep layer prospecting.
【CateGory Index】: TN713
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