caa a22 4500 445366265 CHVBK 20180317142931.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10909-010-0246-8 doi (NATIONALLICENCE)springer-10.1007/s10909-010-0246-8 Acoustic Resonances in Helium Fluids Excited byQuartz Tuning Forks [Elektronische Daten] [A. Salmela, J. Tuoriniemi, J. Rysti] Ordinary quartz tuning fork resonators, operated at about 30 or 200kHz frequency, couple to acoustic first and second sound resonances in helium fluids under certain conditions. We have studied acoustic resonances in supercritical 4He, normal and superfluid 4He, and in isotopic mixtures of helium. Suggestive temperature, pressure, and concentration dependences are given. Furthermore, we propose a thermometric reference point device based on second sound resonances in helium mixtures, and indicate possible differences in the nature of second sound resonances in superfluid 4He and helium mixtures. Springer Science+Business Media, LLC, 2010 Quartz tuning fork nationallicence Normal 4He nationallicence Superfluid 4He nationallicence Helium mixtures nationallicence First sound nationallicence Second sound nationallicence Salmela A. Low Temperature Laboratory, Aalto University, P.O. Box 15100, 00076, Aalto, Finland aut Tuoriniemi J. Low Temperature Laboratory, Aalto University, P.O. Box 15100, 00076, Aalto, Finland aut Rysti J. Low Temperature Laboratory, Aalto University, P.O. Box 15100, 00076, Aalto, Finland aut Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/5-6(2011-03-01), 678-685 0022-2291 162:5-6<678 2011 162 10909 https://doi.org/10.1007/s10909-010-0246-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10909-010-0246-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Salmela A. Low Temperature Laboratory, Aalto University, P.O. Box 15100, 00076, Aalto, Finland aut NATIONALLICENCE 700 1- Tuoriniemi J. Low Temperature Laboratory, Aalto University, P.O. Box 15100, 00076, Aalto, Finland aut NATIONALLICENCE 700 1- Rysti J. Low Temperature Laboratory, Aalto University, P.O. Box 15100, 00076, Aalto, Finland aut NATIONALLICENCE 773 0- Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/5-6(2011-03-01), 678-685 0022-2291 162:5-6<678 2011 162 10909 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer