Preliminary Assessment of an Ultrasonic Level Sensor for the Calorimetric Measurement of AC Losses in Superconducting Devices

Ricardo Walker, Diogo Durao, Diogo Dias, Isabel Catarino, Joao Murta-Pina, Roberto Oliveira

Research output: Chapter in Book/Report/Conference proceedingChapter in a published conference proceeding

Abstract

Superconducting materials show no resistivity under DC regimes and can generate extremely high magnetic flux densities, allowing for the development of disruptive or improved power grid applications. Yet, under AC, they experience losses that must be removed by the respective cryogenic system, which is responsible for maintaining the superconducting state. Measuring these losses is of utmost importance, e.g., for monitoring the condition of superconducting devices. In this paper, a new calorimetric method for measuring AC losses in superconducting systems is investigated. The proposed concept infers the level of the cryogenic fluid in a cryostat by measuring the echo time from sound waves reflected on it. The thermal energy (losses) that leads to fluid evaporation is then calculated. Using this method may lead to a faster and more direct approach to measuring losses when compared to other concepts, even if the sensor shows some error factors, as well as strict environmental requirements for its operation. A prototype of the sensor is tested in liquid nitrogen, and a preliminary assessment of its performance is carried out.

Original languageEnglish
Title of host publicationProceedings - 2022 International Young Engineers Forum in Electrical and Computer Engineering, YEF-ECE 2022
Place of PublicationU. S. A.
PublisherIEEE
Pages112-116
Number of pages5
ISBN (Electronic)9781665467315
DOIs
Publication statusPublished - 11 Aug 2022
Externally publishedYes
Event2022 International Young Engineers Forum in Electrical and Computer Engineering, YEF-ECE 2022 - Lisbon, Portugal
Duration: 1 Jul 2022 → …

Conference

Conference2022 International Young Engineers Forum in Electrical and Computer Engineering, YEF-ECE 2022
Country/TerritoryPortugal
CityLisbon
Period1/07/22 → …

Keywords

  • AC loss
  • calorimetric method
  • high-temperature superconductor (HTS)
  • ultrasonic sensor
  • ultrasound

ASJC Scopus subject areas

  • Artificial Intelligence
  • Hardware and Architecture
  • Computer Science Applications
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Instrumentation

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