研究目的
The development of a new design of a DC and AC shunt for high intensity current measurement based on NMR methods, aiming to create a primary standard operating in the kA range.
研究成果
The prototype demonstrated the feasibility of the AC/DC shunt concept using NMR for magnetic field measurement, with current measurements agreeing within 1% of a standard resistor. Future improvements include reducing ?int / r and using a mold made of fused quartz for geometric stability.
研究不足
The ratio ?int / r = 0.125 is a major drawback, leading to broad absorption peaks due to exposure to magnetic gradients. Future designs aim for ?int / r to be at least two orders of magnitude lower.
1：Experimental Design and Method Selection:
The design utilizes a coaxial geometry for low inductance and noise immunity, with NMR methods for magnetic field measurement.
2：Sample Selection and Data Sources:
A prototype was constructed with a Cu tube inner conductor and PVC tubing for water flow.
3：List of Experimental Equipment and Materials:
Cu tube (?cu = 28.0 mm), flexible PVC tube (?ext = 3.0 mm; ?int =
4：0 mm), flexible PVC tube (?ext = 0 mm; ?int = 0 mm), solenoid coil for transversal excitation. Experimental Procedures and Operational Workflow:
2.0 mm), solenoid coil for transversal excitation. 4. Experimental Procedures and Operational Workflow: Water is pumped through PVC tubing coiled on the Cu tube, with a solenoid providing transversal excitation. The device is placed in a magnetic null chamber.
5：Data Analysis Methods:
Magnetic polarization is measured at half height of the NMR absorption signal to define B in terms of frequency.
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