Improvement Hardware Design of High Power and Ultra-Low Frequency Signal Source in Cased Hole Resitivity Logging

Cheng Fang Gao; Xiao Meng Wu; Jia Tian Zhang

doi:10.4028/www.scientific.net/AMM.397-400.2278

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 397-400Improvement Hardware Design of High Power and...

Improvement Hardware Design of High Power and Ultra-Low Frequency Signal Source in Cased Hole Resitivity Logging

Abstract:

The cased hole resistivity logging technology is one of high-tech logging technologies being studied in China. The signal source requires high voltage, high current, ultra-low frequency, high stability, high resolution, etc. Based on the characteristics, proposed were the ideas that the direct digital synthesis technique should be applied to produce the required sine logging exciting signals, and high-power FET were used to produce the signals with high power and high voltage. The results show that the output frequency of signal source is 0~ 10 Hz, frequency resolution 0. 002 Hz, output voltage range -300 V~+300V, output current less than 6 A. The design has been successfully applied in the research project of extremely weak nV-level electric signal acquisition theory and experimental study on formation resistivity measurement through metal casing.

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Periodical:

Applied Mechanics and Materials (Volumes 397-400)

Pages:

2278-2281

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.397-400.2278

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Online since:

September 2013

Authors:

Cheng Fang Gao, Xiao Meng Wu, Jia Tian Zhang

Keywords:

AD9850 DDS, Cased Hole Resitivity Logging, Direct Digital Synthesis (DDS), Power Amplification

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References

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DOI: 10.4028/www.scientific.net/amm.397-400.2278

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