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

Janzen, Andreas; Burger, Birgit; Ebersoldt, Andreas; Heidt, Carolin; Langhans, Oliver; Reiner, Alexander; Grohmann, Steffen

Abstract (englisch): 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 Cernox TM type 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.

Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Institut für Technische Thermodynamik und Kältetechnik (ITTK)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.1088/1757-899X/171/1/012117
ISSN: 1757-8981, 1757-899X
KITopen ID: 1000067037
HGF-Programm 37.06.02; LK 01
Erschienen in IOP conference series / Materials science and engineering
Band 171
Heft conference 1
Seiten 012117/1-7
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