液体质量流量计放大电路温度漂移补偿方案
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摘要
为了满足液体质量的准确测量,提出了一种新的小信号温度补偿设计方案。采用高精度的差分输入信号电桥电路,选用AD8429超低噪声、低温漂、高共模抑制比仪表放大器,设计带有温度补偿的温差小信号两级放大电路,通过对芯片温度和环境温度的双重温度考虑,采用铂电阻Pt100,对其进行特殊处理,将其附着在主芯片AD8429上,能够及时感应芯片以及环境温度的变化。测试结果表明,该方案可行,提高了液体质量测量精度,具有一定的实用性。
In order to meet the quality of liquid measurement accurately,this paper proposed a new design of small signal temperature compensation. By using differential input signal of a bridge circuit with high precision and choosing AD8429 instrument amplifier with ultra- low noise,low temperature drift,high common mode rejection ratio,temperature difference with temperature compensation was designed for small signal two- stage amplifier circuit. Taking into account the dual temperature of chip temperature and environmental temperature offered,and by attaching special processed Pt100 platinum resistance to the main chip AD8429,the chip and the change of environmental temperature could be timely sensed. Test results show that the scheme is feasible,can improve the quality of liquid measurement accuracy and has certain practicality.
In order to meet the quality of liquid measurement accurately,this paper proposed a new design of small signal temperature compensation. By using differential input signal of a bridge circuit with high precision and choosing AD8429 instrument amplifier with ultra- low noise,low temperature drift,high common mode rejection ratio,temperature difference with temperature compensation was designed for small signal two- stage amplifier circuit. Taking into account the dual temperature of chip temperature and environmental temperature offered,and by attaching special processed Pt100 platinum resistance to the main chip AD8429,the chip and the change of environmental temperature could be timely sensed. Test results show that the scheme is feasible,can improve the quality of liquid measurement accuracy and has certain practicality.
引文
[1]夏伯雄,杨均青.温度补偿系统使测量仪器更精确.国外电子测量技术,2005,24(9):6-7.
[2]郭天怀.基于电阻应变式称重传感器的电子天平的研制:[学位论文].长春:吉林大学,2006.
[3]刘让周.智能化应变式称重传感器的设计:[学位论文].长沙:湖南大学,2012.
[4]毕满清,王黎明,高文华,等.模拟电子技术基础.北京:电子工业出版社,2008:231-240.
[5]李玲玲,赵全明.压力传感器的温度补偿.传感器世界,2000,8:16-17.
[6]徐桂华.硅压阻式压力传感器的温度补偿.数据采集与处理,1994,3:229-232.
[7]孙凤玲,于海超,王金文,等.硅压阻式压力传感器温度补偿建模与算法研究.微纳电子技术,2007,(增刊1):263-264.
[8]LEE Y T,HEE-DON,KAWAMURA A.Compensation Method of Offset and Its Temperature Drift in Silicon Piezoresistive Pressure Sensor Using Double Wheatstone-bridge Configuration.The 8th international conference on solid-state sensors and actuators,1995:570-573.
[9]江孝国,杨兴林.高精密、高稳定度的应变计测量差动放大电路.信息与电子工程,2010,8(5):575.
[2]郭天怀.基于电阻应变式称重传感器的电子天平的研制:[学位论文].长春:吉林大学,2006.
[3]刘让周.智能化应变式称重传感器的设计:[学位论文].长沙:湖南大学,2012.
[4]毕满清,王黎明,高文华,等.模拟电子技术基础.北京:电子工业出版社,2008:231-240.
[5]李玲玲,赵全明.压力传感器的温度补偿.传感器世界,2000,8:16-17.
[6]徐桂华.硅压阻式压力传感器的温度补偿.数据采集与处理,1994,3:229-232.
[7]孙凤玲,于海超,王金文,等.硅压阻式压力传感器温度补偿建模与算法研究.微纳电子技术,2007,(增刊1):263-264.
[8]LEE Y T,HEE-DON,KAWAMURA A.Compensation Method of Offset and Its Temperature Drift in Silicon Piezoresistive Pressure Sensor Using Double Wheatstone-bridge Configuration.The 8th international conference on solid-state sensors and actuators,1995:570-573.
[9]江孝国,杨兴林.高精密、高稳定度的应变计测量差动放大电路.信息与电子工程,2010,8(5):575.