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File:NISTvoltChip.jpg

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    Original file (1,421 × 878 pixels, file size: 207 KB, MIME type: image/jpeg)

    Summary

    Description
    English: One-volt en:voltage standard developed by en:NIST (formerly en:National Bureau of Standards (NBS) until 1988) based on an array of 3020 superconducting en:Josephson junctions, operating at liquid-helium temperatures. Microwave energy fed into the finguide structure on the left generates a voltage across the 4 chains of junctions on the right.
    Date apparently 1985-1988
    Source NIST paper A Practical Josephson Voltage Standard at One Volt, Figure 1
    Author NBS

    Licensing

    Public domain
    This image is in the public domain in the United States because it is a work of the United States Federal Government, specifically an employee of the National Institute of Standards and Technology, under the terms of Title 17, Chapter 1, Section 105 of the US Code.
    Warning: this does not include Standard Reference Data, as per Standard Reference Data Act (P.L. 90-396; 15 U.S.C. 290-290f) which may be copyrighted by the NIST.

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    Captions

    Voltage standard based on Josephson junctions

    Items portrayed in this file

    depicts

    voltage

    media type

    image/jpeg

    File history

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    Date/TimeThumbnailDimensionsUserComment
    current11:22, 31 March 2017Thumbnail for version as of 11:22, 31 March 20171,421 × 878 (207 KB)Materialscientistcontrast
    06:20, 16 July 2009Thumbnail for version as of 06:20, 16 July 20091,421 × 878 (86 KB)RNLionHigher-resolution view from same NIST source paper to show greater detail.
    13:10, 11 September 2005Thumbnail for version as of 13:10, 11 September 2005472 × 293 (123 KB)ArnoldReinholdSuperconduction chip used by w:NIST to define the w:volt. The chip contains an array of 3020 w:Josephson junctions and operates at liquid w:Helium temperatures. Microwave energy is fed to the junctions through the finguide on the left. Fr

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