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NMR logging sensor noise matching analysis and research

Author: ChangFuBin
Tutor: KongLi
School: Huazhong University of Science and Technology
Course: Detection Technology and Automation
Keywords: NMR Spin echo SNR Sensor Noise matching
CLC: TP212
Type: Master's thesis
Year: 2011
Downloads: 29
Quote: 0
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Abstract


NMR logging instrument is a typical low- field pulse NMR instruments in domestic and international oil and gas development process provides a wealth of indispensable information, instrument consists of sensors , circuits and ground interpretation system consists of three parts , the sensor and circuit directly determines the performance of the instrument , thesis NMR echo signals and signal to noise ratio as the main line , elaborated NMR theory, sensor development, and general system structure and the role of magnetic resonance imaging apparatus , the magnetic field of the antenna , the sensor noise matching , signal extraction and experimental verification. This paper introduces the geomagnetic field , uniform magnetic field , the magnetic field gradient NMR logging sensor structure and application advantages and disadvantages of classical mechanics and quantum mechanics from the perspective of the basic principles described NMR , free induction decay signal then come to the mathematical expression, from SNR put forward sensors and the noise matching design emphasis ; NMR system proposed general framework and modules effect. NMR logging sensor is the most important part of the instrument , which consists of magnets and antennas. Argumentation magnet material selection, calculation of the magnetic field around the antenna saddle , analysis using simulation software Ansoft Maxwell ring magnets and coils detect the relationship between the depth and intensity of the magnetic field , electromagnetic shielding proposed NMR logging tools impact factors . Discusses the sensor noise matching demand ; NMR instrument for low echo SNR , special exponential decay signal , complex work environment characteristics , analysis, simulation, design a simple, common-mode rejection capability, superior performance circuit noise the improved preamplifier circuit , and finally from the common mode rejection and the circuit bandwidth experiments show circuit itself the degree of deterioration of the echo signal to noise ratio .

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor
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