Cryogenic temperature measurement for large applications

Abstract

We have developed a resistance thermometry system for the acquisition, control and monitoring of temperature in large-scale cryogenic applications. The resistance of the sensor is converted to a voltage using a self-balancing AC bridge circuit featuring square-wave excitation currents down to 1 nA. The system is easily scalable and includes intelligent features to treat special situations such as magnet quenches differently from normal operation.

Superconducting NbN microstrip detectors

“…The voltage drop over the strip during the I-V characterisation was limited by a series of two diodes connected in parallel with the strip under study. The temperature was measured using a calibrated germanium thermometer and silicon diode sensors using a multichannel self-balancing bridge circuit [26].…”

Mixed-Lanthanoid Metal–Organic Framework for Ratiometric Cryogenic Temperature Sensing

“…The electronic probes currently used have well-known drawbacks due to contact measurements. 25 Herein, we report a new metal−organic framework LnHL (H 4 L = 5-hydroxy-1,2,4-benzenetricarboxylic acid) containing high concentrations of Ln III ions within 1-D zigzag chains. Notably, on the basis of a mechanism combining both phononassisted energy migration and phonon-assisted energy transfer, Tb 0.95 Eu 0.05 HL can be used as a ratiometric thermometer even down to 4 K and has remarkable temperature sensitivity up to 31% K −1 at 4 K. It is the first time that phonon-assisted energy migration between Ln ions forms the basis of the mechanism of a cryogenic MOF thermometer.…”

“…Extending the sensing temperature range to below 50 K is of great value for both cryogenic research and industrial applications, e.g., energy and space exploration. The electronic probes currently used have well-known drawbacks due to contact measurements …”

Implementation of RuO2-glass based thick film resistors in cryogenic thermometry

“…Also, because their resistance starts to rise quickly at liquid helium temperature, they could serve as stable, sensitive and cheap temperature sensors in the subkelvin temperature range [1,2]. Additionally, benefitting from good immunity to magnetic fields and radiation, they find some interesting applications like such as critical temperature control of the superconducting magnets in CERN's Large Hadron Collider [3], or in cosmicspace investigations in the ARCADE experiment (detection of the cosmic microwave background) [4].…”