基于鉑電阻的溫度高精度測量研究

易先軍 文小玲 劉翠梅武漢工程大學電氣信息學院,湖北武漢430073摘　要:針對采用鉑電阻對溫度進行高精度測量，從硬件電路和曲線擬合2個方面進行了研究。電路上采用同一個電壓給傳感器恒電流驅動電路和A／D轉換電路作參考電壓，保證了溫度檢測的精度，并用最小二乘法直接擬合了描述采樣值一溫度關系的曲線，彌補了Pt100測溫時信號從鉑電阻到A／D轉換的過程中各個中間環節所產生的偏差。該方法可使測量偏差優于0．05℃，并已在研制的高精度溫度溫差控制系統中得到應用。[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

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