High-Accuracy Calibration Based on Linearity Adjustment for Eddy Current Displacement Sensor
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 characteristic...
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MDPI AG
2018-08-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/18/9/2842 |
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| author | Wei Liu Bing Liang Zhenyuan Jia Di Feng Xintong Jiang Xiao Li Mengde Zhou |
| author_facet | Wei Liu Bing Liang Zhenyuan Jia Di Feng Xintong Jiang Xiao Li Mengde Zhou |
| author_sort | Wei Liu |
| collection | DOAJ |
| description | 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 1.9–5.0% more than the one of the original. In addition, the measurement accuracy improves from 11–25 μ m to 1–10 μ m in the range of 6mm, which provides a reliable guarantee for high accuracy displacement measurement. |
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| id | doaj.art-bf65012623d7429fbc5bec346656c776 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T21:45:12Z |
| publishDate | 2018-08-01 |
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| spelling | doaj.art-bf65012623d7429fbc5bec346656c7762022-12-22T04:01:26ZengMDPI AGSensors1424-82202018-08-01189284210.3390/s18092842s18092842High-Accuracy Calibration Based on Linearity Adjustment for Eddy Current Displacement SensorWei Liu0Bing Liang1Zhenyuan Jia2Di Feng3Xintong Jiang4Xiao Li5Mengde Zhou6Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education, Dalian University of Technology, Dalian 116024, ChinaHigh 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 1.9–5.0% more than the one of the original. In addition, the measurement accuracy improves from 11–25 μ m to 1–10 μ m in the range of 6mm, which provides a reliable guarantee for high accuracy displacement measurement.http://www.mdpi.com/1424-8220/18/9/2842eddy current displacement sensorcalibrationlinearity adjustmentweighted support vector machine |
| spellingShingle | Wei Liu Bing Liang Zhenyuan Jia Di Feng Xintong Jiang Xiao Li Mengde Zhou High-Accuracy Calibration Based on Linearity Adjustment for Eddy Current Displacement Sensor Sensors eddy current displacement sensor calibration linearity adjustment weighted support vector machine |
| title | High-Accuracy Calibration Based on Linearity Adjustment for Eddy Current Displacement Sensor |
| title_full | High-Accuracy Calibration Based on Linearity Adjustment for Eddy Current Displacement Sensor |
| title_fullStr | High-Accuracy Calibration Based on Linearity Adjustment for Eddy Current Displacement Sensor |
| title_full_unstemmed | High-Accuracy Calibration Based on Linearity Adjustment for Eddy Current Displacement Sensor |
| title_short | High-Accuracy Calibration Based on Linearity Adjustment for Eddy Current Displacement Sensor |
| title_sort | high accuracy calibration based on linearity adjustment for eddy current displacement sensor |
| topic | eddy current displacement sensor calibration linearity adjustment weighted support vector machine |
| url | http://www.mdpi.com/1424-8220/18/9/2842 |
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