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Article type: Research Article
Authors: Xu, Zhenga; * | Meng, Kaikaia | Cheng, Jiangyana
Affiliations: [a] State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing, China
Correspondence: [*] Corresponding author: Zheng Xu, State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing 400044, China. Tel./Fax: +86 135 2747 5882; E-mail: [email protected]
Abstract: This study presents a high-performance single-sided portable nuclear magnetic resonance (NMR) sensor. The magnet array, which is composed of five identical cuboid permanent magnet blocks and two passive shimming sheets, generates a highly uniform B_{0} field in a 10 × 10 mm^{2} lateral area. Along the two orthogonal lines in this lateral area, the measured B_{0} strength variation is less than 338 ppm. Vertically, the measured B_{0} magnitude decreases from 144.387 mT to 130.603 mT, with a constant gradient of 4.6 T/m from 0.15 mm to 3.15 mm above the magnet surface. A planar radiofrequency coil is optimized according to the signal-to-noise ratio level of the coil. A one-dimensional profiling experiment on an oil film shows that a vertical resolution of approximately 1.7 μm can be achieved. As an application, the silicone rubber insulators are measured using the NMR sensor. Results demonstrate that the silicone rubber insulators with different service times can be distinguished through the transverse relaxation time T_{2} of the silicone rubber insulators.
Keywords: Single-sided NMR, high uniformity, constant gradient, aging level, silicone rubber insulator
DOI: 10.3233/JAE-140123
Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 47, no. 3, pp. 777-790, 2015
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