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设计并实现了基于恒流源驱动四线制PT1000的高精度温度测试系统,分析了温度测试系统中恒流源电路、信号调理电路、A/D转换等单元电路的设计依据和工作原理,给出了电路结构和相关参数.系统引入分段线性化算法,采用最小二乘法对实测数据进行线性拟合,并利用误差评估原理对拟合结果进行评估来确定适用于PT1000的最佳校正方程.实验表明,该系统的精度在0~90℃范围内优于±0.1℃,适用于高精度温度测试,相关技术已应用于福建师范大学新能源工程中心的太阳能光热实验教学系统中.
A high precision temperature test system based on constant current source driving four-wire PT1000 is designed and implemented. The design basis and working principle of constant current source circuit, signal conditioning circuit and A / D converter circuit in temperature test system are analyzed. The circuit structure and the related parameters are introduced.The system introduces the piecewise linearization algorithm, uses the least squares method to fit the measured data linearly, and evaluates the fitting results by using the error evaluation principle to determine the optimal correction equation for the PT1000. Experiments show that the accuracy of the system is better than ± 0.1 ℃ in the range of 0 ~ 90 ℃, which is suitable for high-precision temperature testing. The related technology has been applied in solar thermal experiment system of New Energy Engineering Center of Fujian Normal University.