吉林大学学报(工学版) ›› 2015, Vol. 45 ›› Issue (6): 2034-2042.doi: 10.13229/j.cnki.jdxbgxb201506043

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Design and implementation of an electromagnetic noise test system in nuclear magnetic resonance sounding environment

TIAN Bao-feng, WANG Yue, ZHANG Jian, WU Pei-lin, ZHOU Yuan-yuan   

  1. College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
  • Received:2014-06-10 Online:2015-11-01 Published:2015-11-01

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Abstract: An electromagnetic noise test system based on MSP430 and Field Programmable Gate Array (FPGA) dual controller in the larmor frequency range 1 kHz ~ 3 kHz is designed. The system reduces equivalent input noise by the parallel low noise operational amplifiers. The system realizes the controllable passband and adjustable 128 gain level to get more information about the current environment of electromagnetic noise. NIOS II soft core built in FPGA is used to set up data acquisition system, and the data are archived in the SD card by the SPI bus so as to realize effective data acquisition and storage. Analysis of the indoor and outdoor measured data verifies the effectiveness of the system.

Key words: surface MRS, electromagnetic noise, mixed signal processor(MSP), field programmable gate array(FPGA), data acquisition

CLC Number: 

  • TH763
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