一种数字温度计的设计和校准

Design and calibration of a digital thermometer

设计了一种数字温度计,由单片机STC89C52、温度传感器DS18B20、四位一体共阳极数码管、按键、报警模块、升(降)温模块及电源模块组成.提出了由单片机与温度传感器组成的硬件设计方案,软件系统包括主函数、LED驱动子程序、温度设置子程序、报警处理子程序以及DS18B20温度采集子程序等部分.利用恒温槽和二等标准铂电阻温度计对数字温度计做了静态校准.最后评定了温度示值校准结果的不确定度.

We designed a digital thermometer which consisted of an MCU STC89C52,a temperature sensor DS18B20,a four-in-one common-anode LED digital display,buttons,an alarm module,a warm（cool）module and a power supply.The hardware design scheme included MCU and temperature sensors.The software design scheme included the main program design,the temperature collection subroutine,and the implementation process of the main function module.The digital thermometer was static calibrated with a thermostatic bath and a standard platinum resistance thermometer（Grade Ⅱ）.Finally,the results of temperature uncertainty were assessed.