An auxiliary measurement system of nuclear magnetic resonance(NMR)logging tool based on uni-versal acquisition platform was designed to enable the new generation of NMR logging tool to efficiently and accu-rately acquire information about auxiliary measurement parameters.Based on the universal acquisition platform technology,a detailed analysis was conducted on the necessary parameters and properties in auxiliary measurement of NMR logging tool,and an auxiliary measurement system of NMR logging tool was proposed.The design and re-alization of the hardware functions(e.g.signal conditioning,multichannel switching and digital-analog conversion)of the auxiliary measurement system,as well as the time sequence of sending auxiliary measurement parameter se-lection channel commands and reading auxiliary measurement parameter acquisition data,were investigated.The single board test results show that the selection of auxiliary measurement parameter channels and the uploading of acquired data are feasible.The joint debugging test results show that the designed auxiliary measurement system can accurately obtain the information about auxiliary measurement parameters of NMR logging tool,and reflect the actual working status of the tool.The research results provide a technical basis for the design,research and appli-cation of auxiliary measurement systems of eccentric,while drilling and through-bit NMR logging tools.
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