Abstract
A novel uniform magnetic field coil structure with two pairs of saddle coils nested is proposed in order to minish the aspect ratio without losing much field uniformity, which is significant in innovative miniature atomic instruments and sensors. Optimal configuration parameters are obtained from the Taylor expansion of the magnetic field. The remainder terms are used to estimate the field uniformity and optimize the configuration while minishing computation time. Compared with traditional saddle coils, the nested saddle coils have unique advantages in miniature applications where the aspect ratios are strictly limited. The optimized nested saddle coils were manufactured by Flexible Printed Circuit (FPC) technology and the magnetic field uniformities were verified experimentally using a flux-gate magnetometer. Furthermore, the example application of a miniature nuclear magnetic resonance (NMR) gyro demonstrates the practical use of the nested coils.
Highlights
A transverse magnetic field whose direction is perpendicular to the axis of one thin cylindrical shell is widely used in many atomic systems, e.g. Magnetic Resonance Imaging (MRI), nuclear magnetic resonance (NMR) spectrometer, atomic magnetometers and atomic gyros.[3,4,11,12,14,16] A three-dimensional magnetic field system can be readily produced by two orthogonal transverse magnetic field coils and a solenoid coil by multiplexing the same cylindrical construction
We focus on the design of a miniaturized transverse uniform field coil which is used in atomic gyros, atomic magnetometers or other high precision atomic sensors
We propose a novel coil structure with two pairs of saddle coils nested and an analytical optimization study for making the coil arrangement producing a uniform transverse magnetic field in its center under spatial constraints
Summary
A transverse magnetic field whose direction is perpendicular to the axis of one thin cylindrical shell is widely used in many atomic systems, e.g. Magnetic Resonance Imaging (MRI), NMR spectrometer, atomic magnetometers and atomic gyros.[3,4,11,12,14,16] A three-dimensional magnetic field system can be readily produced by two orthogonal transverse magnetic field coils and a solenoid coil by multiplexing the same cylindrical construction. We focus on the design of a miniaturized transverse uniform field coil which is used in atomic gyros, atomic magnetometers or other high precision atomic sensors. A novel structure with two pairs of saddle coils nested and an analytical optimization study with the goal to minish the aspect ratio of the coil without losing field uniformity are presented. Some advanced numerical methods, such as target field method, whose current distribution can be placed on the surface of the cylinder arbitrarily have been widely used in the design of coils, the traditional analytical method still has its own meaning, especially considering the simplicity of the coil simultaneously This novel configuration is obtained via Taylor series expansion of the magnetic field and optimization of the remainder terms of the expansion. The validity and practicability are illustrated with an actual test and an application demonstration in a miniature NMR gyro
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