Accuracy evaluation of the optically pumped Cs frequency standard at NRLM

Accuracy evaluation of the optically pumped Cs frequency standard at NRLM

The optically pumped cesium (Cs) frequency standard at the National Research Laboratory of Metrology, Ibaraki, Japan (NRLM), NRLM-4, was modified in various ways in order to improve frequency stability and accuracy, We determined the frequency stability by comparing the phase with that of a hydrogen...

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Veröffentlicht in:IEEE transactions on instrumentation and measurement 1999-04, Vol.48 (2), p.496-499
Hauptverfasser: Hagimoto, K., Ohshima, S., Nakadan, Y., Koga, Y.
Format: Artikel
Sprache:eng
Schlagworte:
Atomic measurements
Cesium
Deviation
Frequency estimation
Frequency measurement
Frequency stability
Frequency standards
Hydrogen
Hydrogen masers
Instrumentation
Laboratories
Masers
Metrology
Optical pumping
Stability
Time measurement
Uncertainty
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Zusammenfassung:The optically pumped cesium (Cs) frequency standard at the National Research Laboratory of Metrology, Ibaraki, Japan (NRLM), NRLM-4, was modified in various ways in order to improve frequency stability and accuracy, We determined the frequency stability by comparing the phase with that of a hydrogen maser: the Allan deviation was /spl sigma//sub y/(/spl tau/)=5/spl times/10/sup -13///spl radic//spl tau/. We estimated the frequency corrections and uncertainties due to various sources, and the total uncertainty was found to be 2.9/spl times/10/sup -14/. The frequency difference between NRLM-4 and the international atomic time (TAI) was also measured.
ISSN:0018-9456
1557-9662
DOI:10.1109/19.769640