Practical system for the direct measurement of magneto-caloric effect by micro-thermocouples

0385924 - FZÚ 2013 RIV US eng J - Článek v odborném periodiku
Kamarád, Jiří - Kaštil, J. - Arnold, Zdeněk
Practical system for the direct measurement of magneto-caloric effect by micro-thermocouples.
Review of Scientific Instruments. Roč. 83, č. 8 (2012), "083902-1"-"083902-7". ISSN 0034-6748. E-ISSN 1089-7623
Grant CEP: GA ČR GAP204/12/0692
Výzkumný záměr: CEZ:AV0Z10100521
Klíčová slova: copper * cryostats * magnetic transition * magnetic variables measurement * magnetocaloric effects * microsensors * permanent magnets * refrigeration
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 1.602, rok: 2012

A system for direct measurements of the magneto-caloric effect (MCE) exploits a rapid transport of a sample into or from magnetic field in permanent Halbach-type (1 T) or superconducting (4.7 T)magnets. Time dependence of induced changes of the sample temperature, ∆ T(t), is detected directly by the differential Cu-Constantan-Cu micro-thermocouples with time steps of 300 ms. A sample placed inside an evacuated simple LN2 cryostat is either totally isolated (adiabatic conditions) or partly connected with the copper sample holder (non-adiabatic conditions). The last arrangement (a model of the Brayton cycle) is used to simulate an application of MCE in refrigeration techniques.
Trvalý link: http://hdl.handle.net/11104/0215088