NEW DENSIMETER FOR CRYOGENIC FLUIDS BY MAGNETIC LEVITATION OF A HIGH-TRANSITION TEMPERATURE SUPERCONDUCTOR.

Author(s) : FUJII K., TAKENAKA M., NARA K.

Type of article: Article

Summary

A SUPERCONDUCTING MATERIAL MADE OF YBACUO IS SEALED IN A HOLLOW GLASS BUOY, AND A STABLE LEVITATION OF THE BUOY IS CARRIED OUT WITH THE MEISSNER EFFECT OF THE SUPERCONDUCTOR SIMPLY BY PLACING THE BUOY IN THE FLUID ABOVE A RING-SHAPED PERMANENT MAGNET. THE FLUID DENSITY IS OBTAINED FROM THE MAGNETIC FORCE REQUIRED TO LEVITATE THE BUOY IN THE FLUID. TO MEASURE THIS FORCE, THE MAGNET IS SUSPENDED FROM AN ELECTRONIC BALANCE AND THE REACTION FORCE ACTING ON THE MAGNET IS DETERMINED DIRECTLY AS A CHANGE OF THE APPARENT WEIGHT OF THE MAGNET.

Details

Original title: NEW DENSIMETER FOR CRYOGENIC FLUIDS BY MAGNETIC LEVITATION OF A HIGH-TRANSITION TEMPERATURE SUPERCONDUCTOR.
Record ID : 1989-2141
Languages: English
Source: Rev. sci. Instrum. - vol. 59 - n. 12
Publication date: 1988
Document available for consultation in the library of the IIR headquarters only.

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Indexing

Themes: Cryogenics safety, instrumentation and metrology;
Applications of liquified gases;
Superconduction
Keywords: Yttrium; Superconduction; Oxide; Copper; Ceramics; Measurement; Liquid nitrogen; Barium; Density; Superconductor; Levitation; Measuring instrument; High temperature; Meissner effect; Cryogenics