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(xué)電氣信息學(xué)院,湖北武漢430073摘　要:針對采用鉑電阻對溫度進(jìn)行高精度測量，從硬件電路和曲線擬合2個(gè)方面進(jìn)行了研究。電路上采用同一個(gè)電壓給傳感器恒電流驅(qū)動(dòng)電路和A／D轉(zhuǎn)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(guān)系的曲線，彌補(bǔ)了Pt100測溫時(shí)信號(hào)從鉑電阻到A／D轉(zhuǎn)換的過程中各個(gè)中間環(huán)節(jié)所產(chǎn)生的偏差。該方法可使測量偏差優(yōu)于0．05℃，并已在研制的高精度溫度溫差控制系統(tǒng)中得到應(yīng)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

講得太深了，俺初學(xué)，看不董，收藏了，以后學(xué)習(xí)。謝謝

辦法比較笨，直接用工業(yè)鉑電阻的算法公式就可以了，另外搞這么多運(yùn)放和濾波，簡直是沒法說，直接給一個(gè)激勵(lì)電流給參考電阻和鉑電阻同時(shí)檢測就可以了，在這等精度中無需考慮共模電壓的誤差。