Rotational speed measurement through electrostatic sensing and correlation signal processing

Lijuan Wang, Yong Yan, Yonghui Hu, Xiangchen Qian

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


Rotational speed is a key parameter for the condition monitoring and control of rotating machineries, such as generators, electromotors, and centrifugal and machine tool spindles. It is essential for precision machining and early warning of faults to measure rotational speed in real time. This paper presents the principle and application of electrostatic sensors and correlation signal processing techniques to real-time measurement of rotational speed. The electrostatic sensors and signal conditioning and processing units were designed and implemented. Experimental tests were conducted on a laboratory-scale test rig under a range of conditions including different diameters of the shaft. The results obtained suggest that the distance between the electrodes and the surface of the rotating object is a key factor affecting the performance of the measurement system. The system performs better in terms of accuracy and repeatability at a higher rotational speed (>1000 r/min) as more electrostatic charge is produced on the rotating surface. High and stable correlation coefficients acquired during the tests suggest that the measurement system is capable of providing reliable measurement of rotational speed under realistic industrial conditions.

Original languageEnglish
Article number6680702
Pages (from-to)1190-1199
Number of pages10
JournalIEEE Transactions on Instrumentation and Measurement
Issue number5
Publication statusPublished - 1 Jan 2014


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