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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.

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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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