复合绝缘体内部缺陷的超声全聚焦法

Hongwei Hu, Jinhan Huang, Duo Lyu, Wenzheng Liu, Xiaoqiang Xu
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引用次数: 0

摘要

针对复合绝缘子多层曲面结构和强衰减材料导致的内部缺陷成像检测不佳的问题,研究了双层曲面校正全聚焦法(TFM)。引入了虚拟声源(VS)技术来提高单元素传输的传输能量,结合延迟乘和算法(DMAS)来提高信噪比(SNR),并对护套层和芯棒层中不同尺寸的侧钻孔(SDH)缺陷进行超声成像检测。此外,还对复合绝缘子芯棒层的分层缺陷进行了检测。结果表明,双层表面校正法能够校准超声波的传播时间,从而准确定位缺陷。此外,VS 技术还能有效检测出传统 TFM 无法检测到的芯棒层 SDH 和分层缺陷。采用 DMAS 技术后,TFM 和虚拟声源全聚焦法(VSTFM)的平均信噪比分别提高了 12.75 dB 和 13.77 dB。这表明,DMAS 技术可以显著提高检测信噪比。
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Ultrasonic total focusing method for internal defects in composite insulators
In order to address the problem of poor imaging detection of internal defects caused by the multi-layer curved surface structure and strongly attenuating material of composite insulators, the total focusing method (TFM) with two-layer curved surface correction was investigated. Virtual source (VS) technology was introduced to improve the transmitted energy of the single-element transmission, combined with the delay multiply and sum (DMAS) algorithm to improve the signal-to-noise ratio (SNR) and ultrasonic imaging detection of defects of different sizes of side-drilled holes (SDHs) in the sheath layer and core rod layer. An examination of the delamination defects at the core rod layer of the composite insulators was also carried out. The results show that the double-layer surface correction method is able to calibrate the propagation time of the ultrasonic wave to accurately localise the defects. Moreover, the VS technique is able to effectively detect SDHs and delamination defects in the core rod layer that cannot be detected using the conventional TFM. After incorporating the DMAS technique, the average SNRs of the TFM and virtual source total focusing method (VSTFM) are improved by 12.75 dB and 13.77 dB, respectively. This shows that the DMAS technique can significantly improve the SNR of detection.
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