Actions of a Very Weak Magnetic Gradient: The Reflex of the Dowser

1964 ◽  
pp. 279-286
Author(s):  
Y. Rocard
Keyword(s):  
Magnetic Gradient

scholarly journals Impact factor analysis on precision of magnetic gradient full tensor measurement system

AIP Advances ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 045211
Author(s):  
Lei Xu ◽  
Ning Zhang ◽  
Huadong Chen ◽  
Chunsheng Lin ◽  
Xu Li ◽  
...  
Keyword(s):  
Factor Analysis ◽  
Impact Factor ◽  
Measurement System ◽  
Magnetic Gradient

Factor Analysis on Integrated Error Model of Magnetic Gradient Tensor

2021 ◽  
pp. 1-1
Author(s):  
Lei Xu ◽  
Ning Zhang ◽  
Ming Chang ◽  
Huadong Chen ◽  
Chunsheng Lin ◽  
...  
Keyword(s):  
Factor Analysis ◽  
Error Model ◽  
Gradient Tensor ◽  
Magnetic Gradient ◽  
Integrated Error

scholarly journals MAGNETIC RESONANCE SIGNAL LOSS IN TURBULENT SHEAR FLOW

2002 ◽  
Vol 14 (01) ◽  
pp. 1-11
Author(s):  
LIANG-DER JOU
Keyword(s):  
Shear Flow ◽  
Velocity Fluctuation ◽  
Phase Fluctuation ◽  
Eddy Diffusivity ◽  
Turbulent Shear ◽  
Turbulent Shear Flow ◽  
Signal Loss ◽  
Flow Shear ◽  
Magnetic Gradient ◽  
Spin Echo Sequence

NMR signal loss due to turbulent shear flow is discussed, and a general expression for the phase fluctuation is derived. In the presence of flow shear, the velocity fluctuation perpendicular to the direction of magnetic gradient and the Reynolds stress can cause loss of MR signal Most of signal loss results from the boundary layer, where the flow shear is strong in turbulent pipe flaw, Half the signal loss within the mixing layer distal to a moderate stenosis is caused by the velocity fluctuation in the direction of magnetic gradient, while the remaining results from the velocity, fluctuation perpendicular to the magnetic gradient. The use of eddy diffusivity for the description of signal dephasing in a spin echo sequence is also addressed; A positive, constant eddy diffusivity can not describe the temporal change of phase fluctuation correctly.

Influence of a superconducting quantum interferometer on magnetic gradient meter characteristics

1990 ◽  
Vol 33 (3) ◽  
pp. 257-260
Author(s):  
V. A. Kulikov ◽  
N. V. Popova ◽  
A. Yu. Serebryakov
Keyword(s):  
Magnetic Gradient ◽  
Quantum Interferometer ◽  
Superconducting Quantum Interferometer

scholarly journals Simulation Analysis of Magnetic Gradient Full-Tensor Measurement System

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Lei Xu ◽  
Ning Zhang ◽  
Liqing Fang ◽  
Huadong Chen ◽  
Pengfei Lin ◽  
...  
Keyword(s):  
Magnetic Dipole ◽  
Measurement System ◽  
Measurement Accuracy ◽  
Simulation Analysis ◽  
Magnetic Gradient ◽  
Measurement Systems ◽  
Magnetometer Array ◽  
Array Structure ◽  
Simulation Results ◽  
Planar Measurement

The magnetic gradient full-tensor measurement system is diverse, and the magnetometer array structure is complex. Aimed at the problem, seven magnetic gradient full-tensor measurement system models are studied in detail. The full-tensor measurement theories of the tensor measurement arrays are analyzed. Under the same baseline distance, the magnetic dipole model is used to simulate the measurement system. Based on different measurement systems, the paper quantitatively compares and analyzes the error of the structure. A more optimized magnetic gradient full-tensor measurement system is suggested. The simulation results show that the measurement accuracy of the planar measurement system is slightly higher than that of the stereo measurement system. Among them, the cross-shaped and square measurement systems have relatively smaller structural errors and higher measurement accuracy.

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