冷轧带钢原始波形信号零点误差补偿方法  

Original waveform signal zero error compensation method of cold rolling strip

作　　者：杨利坡[1] 于丙强[1] 付强[1] 

机构地区：[1]燕山大学国家冷轧板带装备及工艺工程技术研究中心亚稳材料制备技术与科学国家重点实验室,秦皇岛066004

出　　处：《仪器仪表学报》2013年第4期927-934,共8页Chinese Journal of Scientific Instrument

基　　金：国家科技支撑计划(2011BAF15B03);河北省高等学校自然科学研究青年基金(Q2012104)资助项目

摘　　要：板形检测辊是在线检测冷轧带钢板形缺陷的关键仪器。在中试过程中,各检测通道的原始波形信号总存在或大或小的零点漂移,一定程度上影响板形检测辊的检测精度。基于压磁传感器特性、差动补偿回路及调制解调过程等,推导冷轧带钢原始波形信号的数学表达式,深入研究板形检测辊板形信号零点漂移的产生机理,建立了相应的工艺误差补偿模型。结合板形机理和实测数据,精细调整电路结构,对原始波形信号进行综合误差补偿,显著降低零点残存电压,提高原始波形信号的信噪比,零点残存电压从200～500 mV降低到了10 mV以下,A/D零点值降低到了50以内,为提高板形检测辊标定精度和冷轧带钢在线板形检测精度,奠定了坚实的理论基础。Shape detection roll is the key instrument for online detecting shape defects of the cold rolling strip. In the intermediate productive process,large or small zero drifts exist in the original waveform signals of the detection chan- nels, which affect the detection accuracy of the strip shape detecting roll to some extent. Based on the characteristics of piezomagnetic sensor, differential compensation circuit, modulation and demodulation method and etc. , the mathe- matical expression of original shape signal is derived. The mechanism of shape signal zero drift of the strip shape de- tecting roll is studied in detail, the corresponding technological error compensation model is established. Based on the shape detection mechanism and the test data, the circuit structure is adjusted carefully to comprehensively compensate the error of the original shape signal, which obviously decreases the zero residual error of the signal and improve the signal-to-noise ratio of the original shape signal. The zero residual voltages of the shape detecting roll are reduced from 200 ~ 500 mV down to below 10 mV,the AD zero values are reduced down to below 50 after comprehensive compensation. So the proposed compensation method lays a solid foundation for improving the strip shape detecting roll calibration accuracy and the online strip shape detection precision.

关 键 词：板形信号 零点补偿 板形检测 板形仪 冷轧带钢 

分 类 号：TP211.32[自动化与计算机技术—检测技术与自动化装置]