基于数字图像识别和光纤传感器的直流大电流在线校准装置  

DC High Current On-Line Calibration Devicebased on Digital Image Recognition and Optical Fiber Sensor

作　　者：梅国健 王家福[3] 李传生[3] 林飞鹏[3] 董平 邵海明[3] 蔡晋辉[1] MEI Guo-jian;WANG Jia-fu;LI Chuan-sheng;LIN Fei-peng;DONG Ping;SHAO Hai-ming;CAI Jin-hui(China Jiliang University,Hangzhou,Zhejiang 310018,China;Zhejiang Institute of Metrology,Hangzhou,Zhejiang 310018,China;National Institute of Metrology,Beijing 100029,China;Shanxi Institute of Metrology,Taiyuan,Shanxi 030021,China)

机构地区：[1]中国计量大学,浙江杭州310018 [2]浙江省计量科学研究院,浙江杭州310018 [3]中国计量科学研究院,北京100029 [4]山西省计量科学研究院,山西太原030021

出　　处：《计量学报》2021年第5期623-628,共6页Acta Metrologica Sinica

基　　金：国家重点研发计划(2016YFF0201202,2016YFF0102404)。

摘　　要：在电解冶金和电化学工业领域,大量霍尔直流超大电流传感器无预留校准接口。针对这一实际问题,设计了一种基于数字图像识别和光纤电流传感器的直流大电流在线校准装置。该在线校准装置以光纤电流传感器为标准,利用图像传感器实时采集霍尔电流传感器二次显示仪表的示数图像,对采集到的图像进行灰度化、中值滤波、二值化、闭运算、字符分割等预处理,并采用穿线法进行图像识别,获取霍尔电流传感器的采样值,并与光纤电流传感器的标准测量值进行实时比较,计算被校霍尔电流传感器的测量误差。现场校准的实验结果验证了校准方法及装置的可行性。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.

关 键 词：计量学 直流大电流 光纤电流传感器 数字图像识别 霍尔大电流传感器 在线校准 

分 类 号：TB971[一般工业技术—计量学]