基于铂电阻的温度高精度测量研究

易先军 文小玲 刘翠梅武汉工程大学电气信息学院,湖北武汉430073摘　要:针对采用铂电阻对温度进行高精度测量，从硬件电路和曲线拟合2个方面进行了研究。电路上采用同一个电压给传感器恒电流驱动电路和A／D转换电路作参考电压，保证了温度检测的精度，并用最小二乘法直接拟合了描述采样值一温度关系的曲线，弥补了Pt100测温时信号从铂电阻到A／D转换的过程中各个中间环节所产生的偏差。该方法可使测量偏差优于0．05℃，并已在研制的高精度温度温差控制系统中得到应用。[著者文摘]
Study of high-precision temperature measurement based on platinum resistanceYI Xian-jun, WEN Xiao-ling, LIU Cui-mei School of Electrical and Information Engineering, Wuhan Institute of Technology, Wuhan 430073, ChinaAbstract:The high-precision t of temperature in platinum resistance is introduced,its research covers two aspects, such as the hardware circuit and curve fitting. In hardware circuits sensor constant current drive circuit and A/D converter circuit use the same voltage as a reference voltage, so it guarantees the temperature measurement accuracy. In curve fitting, it fits the curve which describes the relations of sampling value-temperature by using least squares method, It compensates the deviation which occurs in each middle part of the signal from platinum resistance to the A/D conversion in the temperature measurement of Ptl00. This method can make measurement error superior to 0.05 ℃, and now it applies to the development of high-precision temperature thermal control system.[著者文摘]

Key words:platinum resistance; temperature detection circuit; least squares method; curve fitting

讲得太深了，俺初学，看不董，收藏了，以后学习。谢谢

办法比较笨，直接用工业铂电阻的算法公式就可以了，另外搞这么多运放和滤波，简直是没法说，直接给一个激励电流给参考电阻和铂电阻同时检测就可以了，在这等精度中无需考虑共模电压的误差。