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LC-circuit calorimetry


Bossen, O; Schilling, A (2011). LC-circuit calorimetry. Review of Scientific Instruments, 82(9):094901.

Abstract

We present a new type of calorimeter in which we couple an unknown heat capacity with the aid of Peltier elements to an electrical circuit. The use of an electrical inductance and an amplifier in the circuit allows us to achieve autonomous oscillations, and the measurement of the corresponding resonance frequency makes it possible to accurately measure the heat capacity with an intrinsic statistical uncertainty that decreases as ∼ tm−3/2 with measuring time tm, as opposed to a corresponding uncertainty ∼ tm−1/2 in the conventional alternating current method to measure heat capacities. We have built a demonstration experiment to show the feasibility of the new technique, and we have tested it on a gadolinium sample at its transition to the ferromagnetic state.

We present a new type of calorimeter in which we couple an unknown heat capacity with the aid of Peltier elements to an electrical circuit. The use of an electrical inductance and an amplifier in the circuit allows us to achieve autonomous oscillations, and the measurement of the corresponding resonance frequency makes it possible to accurately measure the heat capacity with an intrinsic statistical uncertainty that decreases as ∼ tm−3/2 with measuring time tm, as opposed to a corresponding uncertainty ∼ tm−1/2 in the conventional alternating current method to measure heat capacities. We have built a demonstration experiment to show the feasibility of the new technique, and we have tested it on a gadolinium sample at its transition to the ferromagnetic state.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2011
Deposited On:30 Nov 2011 16:22
Last Modified:13 May 2016 09:35
Publisher:American Institute of Physics
ISSN:0034-6748
Additional Information:Copyright: American Institute of Physics
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1063/1.3632116
Permanent URL: https://doi.org/10.5167/uzh-51374

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