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Rubidium atomic frequency standard physical system miniaturization and a frequency stability test technology

Author: LiJianHua
Tutor: ZhongDa
School: Wuhan Institute of Physics and Institute of Mathematics
Course: Atomic and Molecular Physics
Keywords: rubidium frequency standard physical package magnetic shield SRD multiplier frequency stability test
CLC: O562
Type: Master's thesis
Year: 2004
Downloads: 142
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Abstract


With the development of science and technology, the rubidium frequencystandards (RFS) have been widely used in many fields. At the same time, someapplication fields put forward a lot of requests for it, such as decreasing the volume andweight of RFS, reducing cost and so on .It is very important to test frequency stabilityof the atomic frequency standards (AFS) during the process of development, productionand use of the AFS .Upon those problems, this dissertation has made some relatedresearch.In the first instance, we summarize the development history and the researchadvance of AFS, in addition to some basic principles of the rubidium atomic frequencystandard.In order to simplify the structure of RFS, we redesign the coupling loop of RFSmicrowave cavity. The experiment has proved that our design is successful. On thebasis of experiment, we improved the microwave cavity to reduce the cubage of it. Inaddition, through redesigning other parts of physical package, the whole physicalpackage has become more convenient to assemble, more miniaturized.We have improved the design of magnet shield of the physical package, and haveanalyzed the efficiency of this ameliorative magnetic shield in theory. According to thetest results of magnetic sensitivity, this ameliorative magnetic shield can meet ourdesign request.We have analyzed and calculated the parameter of Step-Recovery-Diode (SRD)multiplier, and got the reckoning formula about some related component. Those will beuseful for the design of multiplier.we have designed and finished a suit of miniaturized RFS cavity and cell system(including SRD multiplier).Then we have assembled it with miniaturized Rb lamptogether, and achieved close loop lock with GS-301 circuit system. As a result, we havegot the stability: 1.5~2×10-111/2 (1s~100s). The frequency stability test is always important in the process of RFSdevelopment. Regarding the high performance HP53132A counter as hard-core, we setup a suit of frequency stability test system. In additon, we design and develop two testsoftware for the interface of RS-232 and IEEE-488.This frequency stability testsystem has been applied in our RFS research and development.

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