期刊
METROLOGIA
卷 52, 期 5, 页码 628-634出版社
IOP PUBLISHING LTD
DOI: 10.1088/0026-1394/52/5/628
关键词
clock comparison; optical frequency ratio; absolute frequency; secondary representation of the second
资金
- EMRP participating countries within EURAMET
- European Union
A method is presented for analysing over-determined sets of clock frequency comparison data involving standards based on a number of different reference transitions. This leastsquares adjustment procedure, which is based on the method used by CODATA to derive a self-consistent set of values for the fundamental physical constants, can be used to derive optimized values for the frequency ratios of all possible pairs of reference transitions. It is demonstrated to reproduce the frequency values recommended by the International Committee for Weights and Measures, when using the same input data used to derive those values. The effects of including more recently published data in the evaluation is discussed and the importance of accounting for correlations between the input data is emphasised.
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