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Research on Miniaturization of Atomic Clock Based on Coherence Population Trapping

Author: ZhangTingKai
Tutor: ZhangHongHai;GanZhiYin
School: Huazhong University of Science and Technology
Course: Mechanical Manufacturing and Automation
Keywords: Number of imprisoned coherent layout Miniature MEMS-based atomic clock Package Anodic bonding Valence bond theory
CLC: TH714.14
Type: PhD thesis
Year: 2009
Downloads: 216
Quote: 0
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Abstract


Atomic clocks are accurate timing tool, astronomy, aerospace, satellite navigation and physical sciences play an important role, but because of its large size, is largely limited its scope of application. To achieve the miniaturization of atomic clocks can extend the application of atomic clocks in different industries, expanding atomic clock applications, will bring positive social and economic benefits. Therefore, in recent years become miniaturized atomic clocks of a national research hotspot. This paper focuses on miniature atomic clocks, atomic clocks carried out on the micro-physical mechanism, design methods and production technology research. Number of coherent layout imprisoned (CPT: Coherent Population Trapping) based on the physical mechanism, research CPT atomic clock frequency control system. From the physical mechanism to build atomic clock frequency control system model atomic clock timing performance can be achieved for a deeper understanding of design practice for guiding the atomic clock has an important significance, based on the physical mechanism modeling difficulty is to establish the mathematical model of atomic physics systems. Firstly, the CPT resonance equations, based on the research of laser modulation under CPT resonance mechanism, you can get with the modulation frequency (ie, timing output frequency) described CPT resonance equation; further research lines based CPT atomic clock locked mathematical process to achieve , and through the physical process of the laser modulation frequency discriminator system signal flow analysis model of the physical system frequency discriminator. Finally, according to the atomic clock atomic clock system components system frequency control system model. Further research on the basis of the frequency control system design and implementation of various programs, and atomic model of the frequency control and short-term stability of stability of approach. Miniaturized atomic clocks is one of the key physical components - alkali metal vapor chamber - the miniaturization, this paper describes the chip level, based on atomic clocks, atomic clocks discussed further miniaturization common basic aspects of the production process, including material selection, processing , encapsulation methods. Studied the physical system to achieve miniaturization of the various characteristics and the feasibility of process methods. Finally, the process method based on MEMS technology, design miniaturized atomic physics system. In order to improve the production of alkali metal vapor chamber level, in-depth study of the implementation based on glass - silicon - glass structure of the alkali metal vapor cavity packages produced MEMS bonding process - anodic bonding. According to the conductivity properties of the glass to study bonding process current characteristics were obtained under different bonding analysis and comparison of current mathematical models. Based on valence bond theory, the anodic bonding mechanism model, further bonding process and the electrical properties of the outer circuit of the intrinsic relationship bonding quality. Based on these two points, the establishment of different bonding conditions bonding quality comparative analysis model. Combined into bond theory is discussed in detail anodic bonding of new methods of operation - two electrode layers anodic bonding - bonding mechanism, and explains the special bonding process phenomena - current pulse - generation mechanism. Carry out the relevant experimental study. Finally, a miniature atomic physics systems to produce practical issues involved in the process and provide the appropriate solution strategies; brief introduction to the production of small MEMS-based CPT atomic clock prototype.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Measuring instruments > Time - measuring instruments > Benchmark ( standard ) timing equipment > Atomic clock
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