Development of High-precision Temperature Measurement System Based on ARM
The high-precision temperature measurement system which adopts ARM processor LM3S1138 as controlling core was introduced in this paper. In the temperature measuring circuits,the current driving circuit of sensor Ptl00A and A/D converting circuit adopt the same reference voltage,which makes AID conversion results are only dependent on the changing value of platinum resistance with the temperature change △Rr,and will not be affected by the stability of sensor constant current drive current and the reference voltage accuracy of AID converter,the design method has improved the sampling accuracy of the system hardware effectively. In the software calibration of measurement error,Least Squares Method was used to fit the sampling value-temperature curve in connection with the measured data of various temperature sections,it offsets the deviation which occurred in various intermediate links of the signal from platinum resistance to the AID conversion in the temperature measurement of PtlOOA. In the temperature measurement process,ARM processor do real-time computing to get final temperature measurement results according to the A/D sample value and combined with the polynomial of Sub-fitting. Actual measurement results show that,the system temperature deviation is less than 0.05℃.
ARM high-precision measurement temperature detection circuit least squares method curve fitting.
Yi Xianjun Liu Cuimei
School of Electrical and Information Engineering,Wuhan Institute of Technology 693 Xiongchu Avenue.Wuhan,430073 P.R.China
国际会议
2009 9th International Conference on Electronic Measurement & Instruments(第九届电子测量与仪器国际会议 ICEMI2009)
北京
英文
795-799
2009-08-16（万方平台首次上网日期，不代表论文的发表时间）