New temperature measuring methods for improving accuracy and dynamic behavior of sensors
Hans Volker · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1993
High accuracy measuring technique presupposes a high standard of quality of all components of a system. The first and most significant component in a measuring system is the sensor. Longtime experiences have shown that thermistors are well suited resistance sensors for high precision ternperature measurements. The first essential is that the characteristic of the sensor must be known of course. The method of the determination of this characteristic will be described. As the signal processing requires a high resolution and high rejection of parameter influences multislope analog to digital converters are used in connection with compensation methods. The paper describes the measuring method for accuracies of absolute temperatures of some Milli-Kelvin. The second part deals with the improvement of the dynamic behaviour of slow temperature sensors. The acceleration bases upon the self-heating process of the sensor by a feeding current which is controlled by fuzzy control technique.