基于ADS1248高精度测温装置的设计

摘要

Due to the strict requirement of environment temperature on the transportation and storage of vaccine,a temperature measuring device with high precision is introduced.Pt100 is selected as temperature sensor,the interference of transmission line is removed by using four-lines measuring method.And a ratio measurement method is designed so that the precision of the system depends only on a high precision resistor.The using chip of ADS1248 contains a PGA amplifier and a 24 bit ADC chip,which reduces the complexity of the device and provides high resolution.The measurement precision reaches 0.1 ℃,meeting the vaccine delivery and storage requirement.%针对疫苗的运送及仓储过程中对环境温度的严格要求,设计了高精度的测温装置.选用了Pt100作为温度传感器,采用四线制测量方法去除了传输线上的干扰,设计了比例测量法使系统的精度仅依赖于一个高精度电阻.选用的ADS1248芯片内部包含了PGA放大器及24位ADC芯片,降低了装置的复杂性,同时具有较高的分辨率.经测试,本装置的测温精确达到0.1℃,能够满足疫苗的运送及仓储的要求.