用于复合绝缘子伞裙老化状态检测的单边核磁共振传感器

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Abstract In order to quantitatively measure the aging status of the composite insulator with non-destructive method, a new portable unilateral nuclear magnetic resonance (NMR) sensor was designed. The structures of its magnet and radio-frequency coil were optimized. Three composite insulators with different years were tested. The NMR echo signals of the samples were obtained by the nuclear magnetic resonance spectrometer. These NMR echo signals were processed with the mono-exponential fitting method to obtain the equivalent transverse relaxation time T₂. The result demonstrates that, as the service year of the insulator increases, the equivalent transverse relaxation time T₂ decreases. At the same time, the contact angle method was employed to compare with the NMR method. It shows that T₂ and static contact angle have the same changing trend along with the service time, but the T₂ parameter changes more obviously than the static contact angle.

Key words： Composite insulator aging status detection unilateral nuclear magnetic resonance equivalent transverse relaxation time

Received: 27 May 2014 Published: 12 July 2016

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