NTC热敏电阻器在高精度温度测量中的应用_于丽丽.pdf

DOI :10.13873/j.1000 12.026 　2004 23 12 　　　　　　　　　　(Journal of Transducer Technology) 75 NTC 1 2 2 于丽丽, 王剑华, 殳伟群 (1. , 200092;2. , 200092) 　:NTC 。 , , : ;;(24 )ADC; ;。 :(0 ～ 60 ℃) ±0.001 ℃。 :;; :TP223　　　:A　　　:1000-9787(2004)12-0075-03 Application of NTC thermistor in high accurate temperature measurement 1 2 2 YU Li-li , WANG Jian-hua , SHU Wei-un (1.Dept of Elct Info, Tongji University, hanghai 200092, China; 2.Dept of China-Germany, Tongji University, hanghai 200092, China) Abstract:A few resolvents of the problems in high accurate temperature measurement using NTC thermistors are intro- duced.The various factors affected measurement accuracy are analyzed, and a few resolvents are advanced.Some mea- sures are used:constant current source offering microampere current, 4 wire temperature measuring circuit, ADCwith ex- cellent resolution, digital filter, instrument recalibration itself, etc.It is indicated that high accuracy of 0.001 ℃in a nar- row range of temperature (0 ～60 ℃)can be achieved by using fit thermistors. Key words:thermistor;high-accurate temperature measurement;calibration 0　　 B C D R=exp(A+ + + ), (1) NTC 、、 T T2 T3 　T , K;R T , 、。 , , , Ψ。 A, B, C, D 4 。 。 , , (4 ) 。 、。 , , 。 、 T R A , B, C, D , (22 ℃±0.01 ℃), 、