Abstract

Aiming at the requirement of low-power dissipation,fast-response and high precision temperature measurement for hydrogeology and environmental geology survey,the high precision thermistor temperature measurement system was developed based on voltage-controlled constant current source. The MSP430F5438 was used as the main control chip. The thermistor was drived by the voltage-controlled constant current source with the low power dissipation single-supply,and the output signal was collected by the 12 bits high resolution analog-to-digital converter module on the MSP430F5438 processor. Meanwhile,the least square method was used to deal with nonlinear correction of thermistor,so that the temperature was measured accurately. The results indicate that high accuracy of ± 0. 02 ℃ in the range of- 10 to 50 ℃ can be achieved and the measurement system has the advantages of low-power dissipation,high integration degree and strong reliability.

Authors and Affiliations