Design of An FPGA-Based Control Logic in NMR Logging Tool

Abstract

Abstract:

Using a CPMG pulse sequence, NMR logging tool transmits high-power radiofrequency (RF) pulses, receives weak echo signals following timing schedule of the CPMG pulse sequence, and dissipates energy stored in the antenna after transmitting the RF pulse. In this article, the control logic of the NMR logging tool is introduced. Field programmable gate array (FPGA) was used to control the timing of the CPMG pulse. The principles and timing requirement of transmitter, Q-switch and de-coupler were given. Simulation results were provided. The control logic introduced was used in a prototype NMR logging tool successfully.

Key words: NMR logging tool, CPMG, pulse sequence, FPGA

CLC Number:

YU Hui-Jun, XIAO Li-Zhi, V. Anferov, S. Anferova, ZHU Wan-Li, LIU Hua-Bing, GUO Bao-Xin. Design of An FPGA-Based Control Logic in NMR Logging Tool[J]. Chinese Journal of Magnetic Resonance, 2012, 29(2): 201-208.

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