An absorption-type proton NMR magnetometer for measuring low magnetic fields

被引：15

作者：

Begus, S. ^{[1
]}

Fefer, D. ^{[1
]}

机构：

[1] Fac Elect Engn, SI-1000 Ljubljana, Slovenia

来源：

MEASUREMENT SCIENCE AND TECHNOLOGY | 2007年 / 18卷 / 03期

关键词：

NMR magnetometer; direct digital synthesizer; sampling detector; DSP lock-in amplifier;

D O I：

10.1088/0957-0233/18/3/045

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A highly sensitive absorption-type nuclear magnetic resonance (NMR) magnetometer capable of measuring low magnetic fields below 1 mT with a NMR sample volume of 3 cm(3) is described. It will be used for calibration purposes in an accredited calibration laboratory. The magnetometer uses a direct digital synthesizer for generation of the radio frequency signal, a sampling detector for demodulation of the radio frequency signal and a digital signal processor with an analogue-to-digital converter and a digital-to-analogue converter for signal processing using a lock-in technique with a digital phase sensitive detector. Frequency traceability of the NMR magnetometer reference oscillator is established by means of the long-wave transmitter DCF77.

引用

页码：901 / 906

页数：6

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