Signal-to-noise ratio of temperature measurement with Cernox sensors at various supply currents

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Janzen, A.^1 ; Burger, B.^2 ; Ebersoldt, A.^2 ; Heidt, C.^1,3 ; Langhans, O.^3 ; Reiner, A.^3 ; Grohmann, S.^1,3

Institute for Technical Thermodynamics and Refrigeration, Karlsruhe Institute of Technology, Karlsruhe

76131, Germany^1

Institute of Data Processing and Electronics, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen

76344, Germany^2

Institute for Technical Physics, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen

76344, Germany^3

关键词: Calibration temperature;    Cryogenic system;    Current sources;    Digital multimeters;    Supply currents;    Temperature offset;    Temperature range;    Thermal methods;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012117/pdf
DOI  :  10.1088/1757-899X/171/1/012117

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The Karlsruhe Institute of Technology (KIT) has developed a new thermal method for flow measurement, which is particularly suitable for the application in cryogenic systems. In this method, the stability and the resolution of temperature measurement is important, rather than precision. In other words, constant offsets in temperature measurements can be ignored, and the temperature sensors can be operated at supply currents beyond their nominal design value in order to gain resolution. For this application, the performance of two CernoxTMtype CX-1050-SD-HT-1.4L sensors was measured in a temperature range between 300 K and 4 K. The experiments were carried out in the calibration cryostat at the Institute for Technical Physics. Sensors were connected to a Lake Shore Model 121 current source and a Keithley 2701/E digital multimeter for voltage measurements. At constant calibration temperatures, the supply currents were varied such that the resulting voltage drops lay in-between 10 mV and 100 mV. The influence on both the noise and the temperature offset are presented.