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THE STUDY OF AGING frequency drift MECHANISM FOR QUARTZ CRYSTAL RESONATORS

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THE STUDY OF AGING FREQUENCY DRIFT MECHANISM FOR QUARTZ CRYS...

2013全国压电和声波理论及器件技术研讨会

作者： Xiao-san YIN Chun-nan SHEN TXC（Ningbo） Corporation

Aging as long-term stability is one of the most important characteristics of quartz crystal resonators,and stress and out-gas make major *** this paper,aging frequency drift mechanisms under different conditions of mounting types and aging temperatures are *** results show that the frequency drift under 85℃aging of both two-point and four-point mounted quartz chip are similar;however,the stability performance under 150℃aging of two-point mounted resonator is much better than that of four-point mounted *** main reason is the aging curve of two-point mounted resonator is a comprehensive aging curve,since effects of out-gas and stress are balanced well,which is supported by the IVA test.

关键词： Aging frequency drift Stress Out-gas Mounting type

Precise calibration of zero-crossing temperature and drift of an ultralow expansion cavity with a clock transition spectrum

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Chinese Physics B 2018年第5期27卷 150-154页

作者： Hui Liu Kun-Liang Jiang Jin-Qi Wang Zhuan-Xian Xiong Ling-Xiang He Bao-Long Lu State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071China Key Laboratory of Atomic frequency Standards Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China

We report a clock transition spectrum approach,which is used to calibrate the zero-crossing temperature and frequency drift of an ultralow expansion(ULE)cavity with a Hertz level *** this approach,the linear and nonlinear drifts of the ULE cavity along a variety of controlled temperatures are clearly *** the controlled temperature of ULE cavity is tuned away from the zero-crossing temperature of the ULE cavity,the cavity shows larger and larger nonlinear *** to our theoretical analysis and experimental results,we investigate more details of the drift property of the ULE cavity around the zero-crossing temperature,which has seldom been explored *** can definitely conclude that the zero-crossing temperature of our ULE cavity used in an ytterbium(Yb)lattice clock is around 31.7℃.

关键词： clock transition spectra ULE cavity frequency drift zero-crossing temperature

Thermal analysis of DTL in the SSC-LINAC

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Chinese Physics C 2011年第10期35卷 952-954页

作者：吴锡袁平何源马力祯张小奇吴巍杨雅青 Institute of Modern Physics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

A linear accelerator as a new injector for the Separated Sector Cyclotron at the Heavy Ion Research Facility of LAN Zhou is being designed. The drift-Tube-Linac （DTL） has been designed to accelerate ^238U^34＋ from 0.140 MeV/u to 0.97 MeV/u [1]. The 3D finite element analysis of thermal behavior is presented in this paper. During operation, the cavity will produce Joule heat. The cavity will not work normally due to the high temperature and thermal deformation will lead to frequency drift, So it is necessary to perform thermal analysis to ensure the correct working temperature is used. The result of the analysis shows that after the water cooling system is put into the cavity the temperature rise is about 20 degrees and the frequency drift is about 0.15%.

关键词： finite element method coupling field frequency drift ANSYS code

Analysis of error sources on orbital atomic clocks’stability

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Geo-Spatial Information Science 2012年第3期15卷 207-211页

作者： MAO Yue CHEN Jianpeng DAI Wei JIA Xiaolin State Key Laboratory of Geo-Information Engineering Xi’an 710054China Xi’an Research Institute of Surveying and Mapping Xi’an 710054China State Bureau of Surveying and Mapping Key Laboratory for Polar Surveying and Mapping Science Wuhan 430079China

As a rule,stability calculation of atomic clock requires observations with equivalent sampling *** from atomic clocks in laboratory,orbital atomic clock stability calculations are impacted of raw data sampling intervals,noncontinuous time series,non-data segment,frequency drift,and other ***,the calculated stability results are not so *** this article,the impacts of kinds of error sources on Allan and Hadamard variances are analyzed using global positioning system satellite precise clock offset *** the laws of variety are summarized.

关键词： atomic clocks Allan variance Hadamard variance frequency drift

The effect of parasitic charge on the output stability of MEMS gyroscopes

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Journal of Semiconductors 2018年第8期39卷 47-52页

作者： Nan Liu Yan Su Xin Tong Guowei Han Chaowei Si Zhaofeng Li Jin Ning The Research Center of Engineering for Semiconductor Integration Technology Institute of Semiconductors Chinese Academy of Sciences College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences School of Microelectronics University of Chinese Academy of Sciences School of Electronic Electrical and Communication Engineering University of Chinese Academy of Sciences State Key Laboratory of Transducer Technology Chinese Academy of Sciences

Output voltage drifting was observed in MEMS gyroscopes. Other than the quadrature error, frequency mismatch and quality factor, the dielectric parasitic charge was thought to be a major determinant. We studied the mechanism and variation of the parasitic charge in the MEMS gyroscopes, and analyzed the effect of the parasitic charge on the output stability. This phenomenon was extremely obvious in the Pyrex encapsulated MEMS gyroscopes. Due to the DC voltage required for the electrostatic actuation, the parasitic charge in the dielectric layer would accumulate and induce a residual voltage. This voltage had an impact on the resonant frequency of the gyroscopes, so as to affect the output stability. The theoretical studies were also confirmed by our experimental results. It was shown that the parasitic charge was harmful to the output stability of MEMS gyroscopes.

关键词： dielectric parasitic charge micro-electro-mechanical system(MEMS) gyroscopes frequency drift DC voltage

BDS-3 Onboard Atomic Clock Performance Evaluation

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BDS-3 Onboard Atomic Clock Performance Evaluation

第十一届中国卫星导航年会

作者： Wei Zhou Rengui Ruan Xiaolin Jia Rong Jin Beijing Institute of Tracking and Telecommunications Technology Xi’an Research Institute of Surveying and Mapping Beijing Space Information Relay Transmission Technology Research Center

In order to evaluate the performance of the onboard atomic clock of BDS-3,mult-GNSS observation of the global distributed iGMAS and IGS/MGEX stations are collected,and the BDS/GPS combined precise orb

关键词： BDS-3 satellite clocks iGMAS IGS Allan deviation frequency drift

Performance Analysis of the On-board Atomic Clocks for BeiDou-3 Satellites

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Performance Analysis of the On-board Atomic Clocks for BeiDo...

第十一届中国卫星导航年会

作者： Yunfeng Sun YansongMeng Erwang Du Guanwen Huang Wei Xie Xi’an Branch China Academy of Space Technology(CAST) Chang’an University

15 BeiDou-3 MEO satellite clocks have been chosen to be studied by using the MGEX(Multi-GNSS Experiment) final clock offsets product provided by the IGS(International GNSS Service) MGEX Analysis Centr

关键词： Bei Dou-3 On-board atomic clock frequency stability frequency drift

Performance evaluation and analysis of Beidou-3 on-orbit atomic clock

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Performance evaluation and analysis of Beidou-3 on-orbit ato...

第十一届中国卫星导航年会

作者： Yangyin Xu Anming Zeng Yueyuan Mu College of Geo-Informatics Information Engineering University Xi’an Research Institute of Surveying and Mapping

With the accomplishment of the BDS3 basic system on December 27, 2018 and its beginning to provide initial services, the performance of BDS3 onorbit new hydrogen and rubidium atomic clock which is an

关键词： Beidou global satellite navigation system clock model on-orbit atomic clock frequency drift frequency stability