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| DC High Current On-Line Calibration Devicebased on Digital Image Recognition and Optical Fiber Sensor |
| MEI Guo-jian1,2,WANG Jia-fu3,LI Chuan-sheng3,LIN Fei-peng3,DONG Ping4,SHAO Hai-ming3,CAI Jin-hui1 |
1. China Jiliang University, Hangzhou, Zhejiang 310018, China
2.Zhejiang Institute of Metrology,Hangzhou,Zhejiang 310018,China
3. National Institute of Metrology, Beijing 100029, China
4. Shanxi Institute of Metrology, Taiyuan, Shanxi 030021,China
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Abstract In the field of electrolytic metallurgy and electrochemical industry, a large number of Hall DC high current sensor have no reservation calibration interface. Aimed at the practical problem, a DC large current online calibration device based on digital image recognition and fiber current sensor was designed. The system used the optical-fiber current sensor as the standard and collects the display image of the Hall current sensor secondary display instrument in real time by the image sensor. Besides, it performed some pre-processors, such as grayscale, median filtering,binarization, closing operation, character segmentation, etc. on the collected image. By adopting the threading method for image recognition, the sampling value of the Hall current sensor was obtained. Then, after compared with the standard measurement value of the fiber-optic current sensor in real time, the measurement error of the controlled Hall current sensor was calculated. The results of field calibration experiments verified the feasibility of the calibration method and device.
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Received: 15 October 2019
Published: 24 May 2021
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2021, Vol. 42 
