Recent Advances in Metrology and Fundamental Constants

Recent Advances in Metrology and Fundamental Constants

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Over the last decade of the 20th century, many improvements took place in the field of metrology and fundamental constants. These developments and improvements are discussed in this book. The old caesium SI second definition has found a new realization with the fountain approach, replacing the classical thermal atomic beam. The use of cold atom techniques, slowed down and cooled, has opened a number of unexpected avenues for metrology and fundamental constants, one of these possibilities being the atom interferometry. Another development was the demonstration of the possiblility of performing a direct frequency division in the visible, using short femtosecond pulses. Many other developments are also discussed.The voltage drop Vh across Rh is compared against a closely adjusted voltage Vp generated by an auxiliary circuit using a ... The sequence of current reversals and change of measurement positions is chosen is such a way that linear drifts of the current ... Schematic circuit diagram for a potentiometric resistance bridge.

Title:Recent Advances in Metrology and Fundamental Constants
Author: Società italiana di fisica
Publisher:IOS Press - 2001-01-01

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