Metrology at the frontiers of physics and technology
The spectroscopy of trapped ions or laser-cooled atoms offers the prospect of visible frequency standards to match or even exceed the accuracy of the caesium standard. The development of satellite methods for time comparisons has improved by more than an order of magnitude the accuracy with which national laboratories can routinely compare their clocks. Mechanical metrology has not been left behind. Driven by the need to improve manufacturing technology, major advances have taken place in computer control machining and mechanical measuring systems. These, and many other fascinating developments in the field of metrology are presented in this book.
What people are saying - Write a review
We haven't found any reviews in the usual places.
Gruppo fotografico dei partecipanti al Corso fuori testo
The standards of electriccurrent intensity tension and resistance
B W Petley The continuing evolution in the definitions and real
31 other sections not shown
Other editions - View all
accuracy array atomic atomic clocks beam BIPM black-body calculated calibration cavity CGPM clocks components constant cryogenic cryogenic radiometer defined definition density detector determined diode distribution electrical electron emission energy Eotvos equation error experiment experimental fine-structure constant gravitational HCN laser heat sink HIPPARCOS International inverse square law Josephson Josephson effect Josephson junction junction kilogram Klitzing klystron laboratory laser frequency length Lett limits magnetic field Meas measurements metre Metrologia microwave noise observed obtained oscillator parameters phase Phys physical possible precision pressure pulsar quantities quantized Hall resistance quantum Hall effect radiation radiometer range ratio realization reference relative resistor resonance rotation sample scale series-array shown in fig signal stability standard step superconducting test mass thermal thermodynamic temperature thermometer thermometry tion torsion balance transducer transition triple point uncertainty units velocity voltage zero