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Open AccessArticle

An Online Calibration Method for a Galvanometric System Based on Wavelet Kernel ELM

School of Mechanical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
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Sensors 2019, 19(6), 1353; https://doi.org/10.3390/s19061353
Received: 26 January 2019 / Revised: 9 March 2019 / Accepted: 13 March 2019 / Published: 18 March 2019
(This article belongs to the Section Physical Sensors)
The online calibration method of a two-dimensional (2D) galvanometer requires both high precision and better real-time performance to meet the needs of moving target position measurement, which presents some challenges for traditional calibration methods. In this paper, a new online calibration method is proposed using the wavelet kernel extreme learning machine (KELM). Firstly, a system structure is created and its experiment setup is established. The online calibration method is then analyzed based on a wavelet KELM algorithm. Finally, the acquisition methods of the training data are set, two groups of testing data sets are presented, and the verification method is described. The calibration effects of the existing methods and wavelet KELM methods are compared in terms of both accuracy and speed. The results show that, for the two testing data sets, the root mean square errors (RMSE) of the Mexican Hat wavelet KELM are reduced by 16.4% and 38.6%, respectively, which are smaller than that of the original ELM, and the standard deviations (Sd) are reduced by 19.2% and 36.6%, respectively, indicating the proposed method has better generalization and noise suppression performance for the nonlinear samples of the 2D galvanometer. Although the online operation time of KELM is longer than ELM, due to the complexity of the wavelet kernel, it still has better real-time performance. View Full-Text
Keywords: two-dimensional galvanometer; online calibration; wavelet kernel extreme learning machine two-dimensional galvanometer; online calibration; wavelet kernel extreme learning machine
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MDPI and ACS Style

Zhang, W.; Guo, W.; Zhang, C.; Zhao, S. An Online Calibration Method for a Galvanometric System Based on Wavelet Kernel ELM. Sensors 2019, 19, 1353.

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