High-Accuracy Calibration Based on Linearity Adjustment for Eddy Current Displacement Sensor
| Autor: | Zhou Mengde, Zhenyuan Jia, Liang Bing, Wei Liu, Jiang Xintong, Feng Di, Xiao Li |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Accuracy and precision
weighted support vector machine 02 engineering and technology lcsh:Chemical technology 01 natural sciences Biochemistry Displacement (vector) Article Analytical Chemistry law.invention law Control theory 0202 electrical engineering electronic engineering information engineering Eddy current Calibration lcsh:TP1-1185 Sensitivity (control systems) Electrical and Electronic Engineering Instrumentation Mathematics linearity adjustment 020208 electrical & electronic engineering 010401 analytical chemistry Linearity calibration Atomic and Molecular Physics and Optics 0104 chemical sciences Nonlinear system eddy current displacement sensor Voltage |
| Zdroj: | Sensors Volume 18 Issue 9 Sensors (Basel, Switzerland) Sensors, Vol 18, Iss 9, p 2842 (2018) |
| ISSN: | 1424-8220 |
| DOI: | 10.3390/s18092842 |
| Popis: | High precision position control is essential in the process of parts manufacturing and assembling, where eddy current displacement sensors (ECDSs) are widely used owing to the advantages of non-contact sensing, compact volume, and resistance to harsh conditions. To solve the nonlinear characteristics of the sensors, a high-accuracy calibration method based on linearity adjustment is proposed for ECDSs in this paper, which markedly improves the calibration accuracy and then the measurement accuracy. After matching the displacement value and the output voltage of the sensors, firstly, the sensitivity is adjusted according to the specified output range. Then, the weighted support vector adjustment models with the optimal weight of the zero-scale, mid-scale and full-scale are established respectively to cyclically adjust the linearity of the output characteristic curve. Finally, the final linearity adjustment model is obtained, and both the calibration accuracy and precision are verified by the established calibration system. Experimental results show that the linearity of the output characteristic curve of ECDS adjusted by the calibration method reaches over 99.9%, increasing by 1.9&ndash 5.0% more than the one of the original. In addition, the measurement accuracy improves from 11&ndash 25 &mu m to 1&ndash 10 &mu m in the range of 6mm, which provides a reliable guarantee for high accuracy displacement measurement. |
| Databáze: | OpenAIRE |
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