scholarly journals Development of a magnetic resonance sensor for on-line monitoring of {sup 99}Tc and {sup 23}Na in tank waste cleanup processes: Final report and implementation plan

2000 ◽  
Author(s):  
S. L. Dieckman ◽  
J. A. Jendrzejczyk ◽  
A. C. Raptis
Keyword(s):  
Magnetic Resonance ◽  
Final Report ◽  
Implementation Plan ◽  
Waste Cleanup ◽  
Resonance Sensor ◽  
On Line ◽  
Tank Waste

scholarly journals Mini Inside-Out Nuclear Magnetic Resonance Sensor Design for Soil Moisture Measurements

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1682 ◽  
Author(s):  
Jiamin Wu ◽  
Pan Guo ◽  
Sheng Shen ◽  
Yucheng He ◽  
Xin Huang ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Soil Moisture ◽  
Magnetic Resonance ◽  
Sandy Soil ◽  
Particle Diameter ◽  
Silica Sand ◽  
Resonance Sensor ◽  
Small Pore ◽  
Inside Out ◽  
Nuclear Magnetic

The improvement of water management in agriculture by exactly detecting moisture parameters of soil is crucial. To investigate this problem, a mini inside-out nuclear magnetic resonance sensor (NMR) was proposed to measure moisture parameters of model soils. This sensor combines three cylindrical magnets that are magnetized in the axial direction and three arc spiral coils of the same size in series. We calculated and optimized the magnet structure by equivalent magnetization to current density. By adjusting the radius and height between the cylinders, a circumferential symmetric constant gradient field (2.28 T/m) was obtained. The NMR sensor was set at 2.424 MHz to measure the water content of sandy soil with small particle diameter and silica sand with large particle diameter. The complete decaying, an NMR signal was analyzed through inverse Laplace transformation and averaged on a T2 space. According to the results, moisture content of the sample is positively correlated with the integral area of T2 spectrum peak (Apeak); T2 of the water in small pores is shorter than that in large pores, because the movement of water molecules are limited by the inner wall of the pores. In the same volume, water in large pore sample is more than that in small pore sample, so Apeak of silica sand is larger than Apeak of sandy soil. Therefore, the sensor is capable of detecting moisture both content and pore size of the sample. This mini sensor (4.0 cm in diameter and 10 cm in length) is portable, and the lowest measurable humidity is 0.38%. Thus, this sensor will allow easy soil moisture measurements on-field in the future.

EURAMET.L-K7 final report: bilateral comparison on line-scale

Metrologia ◽  
2015 ◽  
Vol 52 (1A) ◽  
pp. 04007-04007
Author(s):  
José Salgado ◽  
Nuruul Alfiyati
Keyword(s):  
Final Report ◽  
Bilateral Comparison ◽  
Line Scale ◽  
On Line
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