A phase-error immune approach for measuring transport AC loss by determination of minimum compensated voltage

Alternating current (AC) loss measurement is crucial for the theoretical evaluation and optimization in the fabrication of superconducting AC devices. Lock-in amplifier based on the lock-in phase is commonly adopted and inevitably involves with phase error. In this work, a novel approach for measuri...

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Veröffentlicht in:Journal of applied physics 2024-05, Vol.135 (19)
Hauptverfasser: Wei, Liangyu, Liu, Cong, Wang, Zeji, Zhou, Jun, Zhang, Xingyi
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creator Wei, Liangyu
Liu, Cong
Wang, Zeji
Zhou, Jun
Zhang, Xingyi
description Alternating current (AC) loss measurement is crucial for the theoretical evaluation and optimization in the fabrication of superconducting AC devices. Lock-in amplifier based on the lock-in phase is commonly adopted and inevitably involves with phase error. In this work, a novel approach for measuring transport AC loss by determining the minimum compensated voltage (MCV) was developed, in which the lock-in amplifier was removed. Since it just uses the voltage signal from an AC voltmeter, it is phase-error immune. Experimental results demonstrated that when using the lock-in amplifier, there existed a system error as the initial phase difference between the sampled (reference) and real current phases, which required careful compensation. In contrast, the phase error no longer needed to be considered by the MCV method, and the AC loss results were obtained much more conveniently with the relative error between the theoretical and the experimental of less than 5%. Finally, the AC loss of a coated conductor spiral wound on an epoxy bar was obtained using the presented approach, demonstrating its low cost, ease of operation, and high accuracy.
doi_str_mv 10.1063/5.0201888
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subjects Alternating current
Electric potential
Error analysis
Lock in amplifiers
Phase error
Voltage
title A phase-error immune approach for measuring transport AC loss by determination of minimum compensated voltage
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