高精度铂电阻温度测量新方法  

A Novel High Precision Temperature Measurement Approach using Platinum Resistance

作　　者：沈峘[1] 李舜酩[1] 周华鹏[1] 李芳培[1] 柏芳超[1] 李忠[1] 

机构地区：[1]南京航空航天大学能源与动力学院,江苏南京210016

出　　处：《压电与声光》2010年第5期889-893,共5页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(50675099);南京航空航天大学引进人才科研启动项目基金资助项目(70205845);江苏省自然科学基金资助项目(BK2007197)

摘　　要：铂电阻是工业测控系统中广泛使用的理想测温元件。常规的温度采集方法是通过测量电阻桥的不平衡电压来实现,其性能依赖于选取的模数转换器精度,高精度测量成本过高。提出一种新的高精度,低成本的铂电阻测温方法。先用RC振荡器将铂电阻变化调制为时变频率信号,再用SSP1492芯片测量该频率变化量,最后送入C8051F021单片机,用高阶多项式完成频率变化到温度变化的解算,实现高精度温度测量。实验结果表明,该方法的测量精度等级高于0.03%(F.S.)。Platinum （Pt） resistance is an ideal temperature sensor that is widely used in the industrial measurement and control system.A common temperature measurement approach is to measure the imbalance voltage produced by the resistance bridge.Since the performance is depended on the precision of the selected analog-to-digital converter,the cost of the high precision measurement is not acceptable.A novel high precision and cost-effective temperature measurement approach using Pt resistance has been proposed.First,a RC oscillate circuit is used to modulate Pt resistance variance to the time-variant frequency signal,and then the frequency changes are measured by SSP1492 chip.Finally,the measurement results are sent to a C8051F021 MCU.The solution from the frequency change to the temperature change is carried out by using the high-order polynomial so that the high precision temperature measurement can be realized.Experimental results demonstrated that the accurate level of the proposed method can achieve to 0.03% （F.S.）.

关 键 词：传感器 信号 温度测量 仪表 铂电阻 

分 类 号：TN384[电子电信—物理电子学]