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| Phase Transient Real-time Measurement on Microwave Synthesizer of Cesium Atomic Fountain Clock |
| LIU Kun,FANG Fang,LIU Nian-feng,LI Tian-chu |
| National Institute of Metrology, Beijing 100029, China |
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Abstract To reduce the microwave leakage-induced uncertainty, a Mach-Zehnder interferometric switch was applied in the interrogation microwave synthesizer of NIM5 Cesium fountain clock. The interferometric switch may introduce the phase transient. Meanwhile, other microwave and electronic parts in fountain clock may also introduce phase transient. The phase transient induces frequency shift and uncertainty. To evaluate the frequency shift and uncertainty, the phase transient Realtime measurement was taken on interrogation microwave synthesizer by home made triggered phase transient analyzer. The seven days continuous measurement result shows that the frequency shift and uncertainty are in 10-16 level, and 100Hz periodic phase transient are found. The periodic phase transient may come from the interrogation microwave synthesizer, which need be researched and improved further.
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［2］Zhang Y, Liu K, Fang F, Liu N F, Li T C. Thermal effect of the microwave Mach-Zehnder interferometric switch ［C］//International Frequency Control Symposium, Taipei, 2014.
［3］刘年丰,林平卫,王平,陈伟亮,林弋戈,李天初. NIM铯原子喷泉钟微波频率综合器的研制 ［J］计量学报,2010,31(3):274-277. |
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2015, Vol. 36 
