基于最小二乘法的热量表温度采集模块设计  

Design of Heat Meter Temperature Acquisition Module Based on Least Squares Method

作　　者：张华强[1] 李玉峰[1] 

机构地区：[1]哈尔滨工业大学(威海)电气工程系,山东威海264209

出　　处：《仪表技术与传感器》2011年第2期16-18,共3页Instrument Technique and Sensor

摘　　要：针对热量表的温度采集模块提出了一种新的硬件电路设计方法和软件控制方案。根据最小二乘法的有关理论建立了温度采集模块的数学模型,采用分布图法剔除采集数据中的疏忽误差,由A/D转换器采集的电压值直接转换成对应的温度值,采用分时供电技术,实现了温度采集模块的低功耗、高精度和高效率。理论分析和实际测试表明:该电路工作稳定,计算简便,理论误差小于0.000 8℃,实测误差小于0.04℃,满足普通热量表误差小于0.1℃的要求,因而具有很大的实用价值。A new design method of hardware circuit and software control scheme of heat meter temperature acquisition module was proposed.According to the theory of least square method,the mathematical model of the temperature acquisition module was established.It used the distribution curve method to eliminate the missing error of the data acquisition.The collected voltage data from the A/D converter can be changed into the corresponding temperature value directly.The low power,high precision and high efficiency of the temperature module was achieved by using the time-sharing power supply technology.Theoretical analysis and practical tests show that the circuit operation is stable,the method of temperature calculation is simple,the theoretical error is less than 0.000 8 ℃,and its measured error is less than 0.04 ℃.It＇s less than 0.1 ℃ ordinary heat meter error requirement and has great practical value.

关 键 词：热量表 最小二乘法 分布图法 分时供电 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置]