The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents the progress made to improve and develop the Bureau International des Poids et Mesures (BIPM) watt balance during the last two years. A reduction by a factor of five of the type A uncertainty was achieved by refining the velocity measurement. The BIPM simultaneous weighing and moving approach was experimentally compared to a bifilar coil technique. The relative difference to the...
This paper presents progress on the BIPM watt balance project. After a first measurement of the Planck constant in air at the 10−5 level, an improvement of a factor of five of the type A uncertainty has been obtained by refining the velocity measurement, now based on a three-axis interferometer system. Currently, the experiment is being transferred inside a vacuum enclosure located in a dedicated...
This paper summarizes the various improvements to and new developments for the BIPM watt balance which have been implemented over the past two years. The main distinctive feature of the BIPM apparatus is its capability for simultaneous force and velocity measurements. The fact that all the major components of the apparatus are now available (although not yet necessarily in final form) has enabled...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.