非平衡电桥测量热敏电阻值的分析研究  

Analysis and Study on Measurement of Thermal Resistance of Unbalanced Bridge

作　　者：孙凡 SUN Fan(Physics Experiment Center,College of Science,Nanjing University of Aeronautics&Astronautics,Nanjing 211106,China)

机构地区：[1]南京航空航天大学理学院物理实验中心

出　　处：《价值工程》2019年第36期195-196,共2页Value Engineering

摘　　要：电桥是测量定值电阻的常用仪器,它是在电桥平衡的条件下将标准电阻与待测电阻相比较以确定待测电阻的数值。用电桥测热敏电阻值随温度变化,由于加热时热敏电阻周围环境温度升高,来不及调节电桥平衡,记录热敏电阻周围环境温度变化时电桥中电流的变化情况,用可调可读的电阻替换掉热敏电阻,调节此电阻到电桥中相同电流变化时,测出某一温度时热敏电阻的阻值。The bridge is a common instrument for measuring the fixed value resistance,which is to compare the standard resistance with the measured resistance under the condition of the balance of the bridge.When we measure the value of the thermal resistor changing with the temperature by the bridge,due to the temperature around the thermal resistor is rising when the thermal resistor is heated,there is no time to adjust the balance of the bridge,write down the current in the bridge at a certain temperature,replace the thermal resistor with an adjustable and readable resistor,adjust this resistance to the same current change in the bridge,and then the value of thermal resistor at a certain temperature is measured.

关 键 词：非平衡电桥 热敏电阻 检流计 温度传感器 

分 类 号：O514[理学—低温物理]