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Title: How Measuring the Planck Constant gets to an Electronic Kilogram Standard

The best measurement of the Planck constant is now derived from the watt balance method. This method measures mechanical power, in reference units of the kilogram (artifact mass standard), second (atomore »mic clocks), and meter (lasers), in ratio to electrical power, in reference units of the volt (Josephson effect) and ohm (quantum Hall effect). Of these reference standards, only the kilogram is still an artifact standard. Thus a high precision measurement of the Planck constant is equivalent to monitoring the SI kilogram artifact, and may be used to redefine the kilogram. This talk will summarize the complexity of making a Planck constant measurement, where there are interesting aspects of basic physics that appear when the ultimate precision of the standards laboratory is applied to obtain an uncertainty of 20 parts in a billion.« less
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Title: How Measuring the Planck Constant gets to an Electronic Kilogram Standard
Authors:
Publication Date: 2007-08-01
OSTI Identifier: 1016754
DOE Contract Number: AC02-07CH11359
Other Number(s): TRN: US201204%%475
Resource Type: Multimedia
Resource Relation: Conference: Fermilab Colloquia, Fermi National Accelerator Laboratory (FNAL), Batvia, Illinois (United States), presented on August 01, 2007
Research Org: FNAL (Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States))
Sponsoring Org: USDOE Office of Science (SC)
Subject: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ; ACCURACY ; LASERS ; METERS ; MONITORING ; PHYSICS
Country of Publication: United States
Language: English
Run Time: 1:19:43
System Entry Date: 2016-01-27