单总线温控和电解质溶液加热技术在水浴系统中的应用

Application of Single-bus Temperature Control and Electrolyte Solution Heating Technology in the Water-bath System

水浴系统设计主要考虑两个问题,即系统的精度与灵敏度。系统的精度主要由温度传感器的精度决定,系统的灵敏度主要与加热源及传热介质有关。传统热电偶精度较低,使得水浴系统的精度不高;传统加热源和导热介质使热量的时空分布不均匀,严重影响了水浴系统的灵敏度。利用单总线温控传感器DS18B20,通过硬件电路与软件程序相结合的温控设计,提高了水浴系统的温控精度;同时,利用电解质溶液加热技术提高了水浴系统的温控灵敏度。设计实验对该水浴系统温控精度进行测试,结果表明其温控精度可达0.05℃;通过电化学理论与实验对该系统的温控灵敏度进行测试,结果证明加热介质的温度变化与传感器指示的温度值能基本保持时间与空间上的同步。

Two issues should be considered in designing a water-bath system,namely,the accuracy and sensitivity of temperature control.The sensor＇s accuracy directly determines the system＇s accuracy.The system＇s sensitivity is largely related with the heat source and the thermal medium.The low accuracy of traditional thermocouples leads to low accuracy of the system.The traditional heat source and thermal medium make the heat distribution uneven in the temporal and spatial domains,resulting in a low sensitivity of the system.In this paper,a system is designed with the hardware and the software combined.First of all,the single-bus temperature sensor DS18B20 is used to improve the system＇s accuracy.Secondly,the system＇s sensitivity is enhanced through utilizing the electrolyte solution heating technique.Some experiments are designed to test the system＇s accuracy.The results show that the system＇s accuracy is up to 0.05℃.Other experiments are used to test the system＇s sensitivity according to the electrochemical theory.The results show that the system can maintain the temperature synchronization in space and time.That is to say,the sensor can capture the system＇s temperature in real time.