摘要
针对差动变压器式位移传感器(LVDT)应用中存在的线性度不够好、智能化程度不够高的问题,从软硬件设计层面,考虑了系统的可靠性、稳定性和灵活性。从应用层面,评估了测量数据的精度、线性度、可溯源性和长期稳定性的需求,设计了一种采用集成化LVDT模拟前端的软硬件一体的数字智能变送器。创新性的设计保证了EEPROM存储的多组标定数据和拟合系数,可对应不同量程或品牌的LVDT,且更换LVDT不影响变送器输出正确的位移值。系统能够在不重新标定的情况下,根据精度需求重新计算拟合系数。实际应用表明,该变送器适用于高精度、高可靠性要求的工业应用场合。
For the linear variable differential transformer(LVDT)application,there is a problem that the linearity is not good enough and the transmitter function is not intelligent enough.Considering the accuracy,stability,traceability and long term stability of the system,a kind of digital intelligent transmitter using integrated LVDT with analog frontend of software and hardware integration is designed.Innovative design ensures that the LVDT with different makes or ranges can be matched by various calibration data and fitting coefficients stored in EEPROM.Replacement of LVDT does not affect the correct displacement value of the transmitter output;the system can recalculate the fitting coefficients according to accuracy requirements without recalibration.The experimental results show that the transmitter is suitable for industrial applications requiring high precision and high reliability.
作者
曹雄恒
李承志
于立
CAO Xiongheng;LI Chengzhi;YU Li(Hunan Institute of Metrology and Test,Changsha 410014,China)
出处
《自动化仪表》
CAS
2020年第2期89-93,共5页
Process Automation Instrumentation
基金
湖南省科技创新计划基金资助项目(2018XK2008)。
关键词
差动变压器式位移传感器
智能变送器
信号调理
线性度
最小二乘法
多项式拟合
数据标定
AD698
Linear variable differential transformer(LVDT)
Smart transmitter
Signal conditioning
Linearity
Least squares method
Polynomial fitting
Data calibration
AD698
