Precision field averaging NMR magnetometer for low and high fields, using flowing water

Area of Science:

• Physics
• Magnetometry
• Magnetic Resonance

Background:

• Accurate magnetic field measurement is crucial in various scientific disciplines.
• Traditional magnetometers can have limitations in sensitivity or range.
• Developing novel techniques for magnetic field sensing is an ongoing research area.

Purpose of the Study:

• To employ the separated oscillatory field magnetic resonance technique (Ramsey technique) for magnetic field measurement.
• To utilize flowing water as a volume-averaging magnetometer.
• To assess the accuracy and applicability of this technique across a wide range of magnetic field strengths.

Main Methods:

• The Ramsey technique was implemented using flowing water as the sample medium.
• Spin polarization and detection were conducted in high external magnetic fields.
• The magnetic field was averaged over a specific volume external to the polarization and detection regions.

Main Results:

• The technique achieved an accuracy of a few parts in 10^7 at a nominal field of 18 G.
• Demonstrated applicability for measuring magnetic fields from kilogauss down to milligauss.
• Showcased the effectiveness of flowing water as a volume-averaging magnetometer.

Conclusions:

• The Ramsey technique with flowing water offers a highly accurate method for magnetic field measurement.
• This approach is versatile and applicable to a broad spectrum of magnetic field strengths.
• Standard equipment can be utilized, making this technique accessible for various applications.