基于Cu50的精确温度测量系统

System of Precision Temperature Measurement Based on Cu50

在基于热电阻的温度测量过程中,由于元器件差异和漂移的影响,会大大降低温度测量准确度;针对这一问题,提出了一种自校正技术的4电阻测量法,通过比较4组测量信号的相对大小来求得被测热电阻的电阻值,进而计算出温度值;该方法的优点是可以抵消测量电路中漂移和元器件差异的影响,从而实现在不同的温度环境下的高精度的温度测量;通过计量炉的实测的数据比较,测量误差小于0.063℃,表明了该方法的有效性和正确性。

In the thermal resistance based temperature measurement, the measure accuracy will greatly decreased due to component difference and drift. To solve this problem, a four resistances self calibration technique is proposed. The resistance value of the thermal re- sistance is obtained by comparing the relative amplitude of the four gauged signals, and then the temperature is calculated. The advantage of the proposed method lles in the drift in the circuit and the component difference will be offset, thereby realizing high--precision temperature measurement in different temperature environment. By comparing the measured data Metrology, measurement error is less than 0. 063 ~C, demonstrate the effectiveness and accuracy of the method.