论文信息 - NIST-7, The U.S. Primary Frequency Standard: New Evaluation Techniques

NIST-7, The U.S. Primary Frequency Standard: New Evaluation Techniques

Abstract : Primary frequency standards achieve their accuracy by direct reference to the definition of the second and evaluation of all known sources of systematic terror that may perturb the measured resonance in the atom. NIST-7, the U.S. primary frequency standard, is a thermal, atomic-beam machine that uses optical pumping for atomic state preparation and detection, and digital frequency control. This technology enables the new evaluation techniques described here. All known systematic effects are determined by means of experiments not involving, or limited by, precision frequency measurements. This both speeds the evaluation and reduces the combined standard uncertainty. Its present value is 5-10(-13) for NIST-7.

[1] G. D. Rovera,et al. Rabi pedestal shifts as a diagnostic tool for primary frequency standards , 1994 .

[2] A.G. Mungall,et al. Frequency and time—National standards , 1986, Proceedings of the IEEE.

[3] Jon H. Shirley,et al. Microwave Leakage as a Source of Systematic Error and Long-Term Instability in Cesium Atomic Beam Frequency Standards , 1994 .

[4] E. Iso,et al. Measurement Uncertainty and Probability: Guide to the Expression of Uncertainty in Measurement , 1995 .

[5] J. Vanier,et al. The quantum physics of atomic frequency standards , 1989 .

[6] R. Drullinger. Optically pumped primary frequency standards , 1990, 44th Annual Symposium on Frequency Control.

[8] M. Arditi. A Caesium Beam Atomic Clock with Laser Optical Pumping, as a Potential Frequency Standard , 1982 .

[9] Robert E. Drullinger,et al. Systematic errors in cesium beam frequency standards introduced by digital control of the microwave excitation , 1995, Proceedings of the 1995 IEEE International Frequency Control Symposium (49th Annual Symposium).