基于单片机的RC震荡R/F多路测温系统设计  

Design of the RC Oscillator R/F Multi-channel Temperature Measurement System Based on the Microcontroller

作　　者：海涛[1] 李昭勇[1] 廖炜斌 林波 

机构地区：[1]广西大学电气工程学院,南宁530004 [2]广西公安厅交警总队科研所,南宁530001 [3]广西比迪光电科技工程有限责任公司,南宁530031

出　　处：《自动化与仪表》2013年第1期51-55,共5页Automation & Instrumentation

摘　　要：由热敏电阻与非门构成RC震荡电路,将热敏电阻阻值转化为频率信号。单片机通过测到的震荡频率,采用拟合法计算出相应的温度值。利用单片机间歇控制非门电源,实现多路快速测温。在实际使用过程中表明,该装置廉价实用,能实现远距离和较高精度的温度测量。The RC oscillator circuit which constitute by the thermistor and the NAND gate,turn the thermistor resis- tance into a frequency signal. Microcontroller take the fitting method by measuring the oscillation frequency to calcu- lated the corresponding temperature values,By controlling the NOT gate power intermittently,the system achieve mul- tiple rapid temperature measurement.The actual use show that the system was cheap and practical,and can achieve Long-distance and high precision temperature measurement.

关 键 词：热敏电阻 RC振荡电路 频率 多路测温 线性分段拟合 精度 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置]