Gradient spin echo enhanced proton precession magnetometer: A novel system for field gradient measurement

Area of Science:

• Geophysics
• Magnetometry
• Physics

Background:

• Conventional proton gradiometers measure magnetic field differences between two points.
• There is a need for instruments that can measure magnetic field gradients at a single location.

Purpose of the Study:

• To introduce a novel gradient spin echo enhanced proton precession magnetometer.
• To demonstrate its capability to measure the first-order gradient of the magnetic field.
• To compare its advantages over conventional proton gradiometers.

Main Methods:

• The system integrates a conventional proton precession magnetometer with a Maxwell coil pair and specialized electronics.
• It utilizes a gradient spin echo process, where the spin echo signal forms at a predictable time.
• This process relies on the background gradient field, switching gradient field, and switching reversal time.

Main Results:

• The gradient spin echo enhanced proton magnetometer measures the field gradient at the same position as the magnetic field.
• The system achieved an average root mean square error of 0.02 µT/m for gradient fields ranging from -0.25 µT/m to +0.25 µT/m.
• The measurement error can be further reduced through system optimization.

Conclusions:

• The gradient spin echo enhanced proton precession magnetometer is a novel system for measuring magnetic field gradients at a single point.
• It offers a significant advantage over conventional proton gradiometers.
• The system shows potential for various applications with further optimization.