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arXiv 2023年

作者： Zheng, Y. Qin, H.R. Miao, S.N. Xin, N.C. Chen, Y.T. Han, J.Z. Zhang, J.W. Wang, L.J. State Key Laboratory of Precision Measurement Technology and Instruments Key Laboratory of Photon Measurement and Control Technology of Ministry of Education Department of Precision Instrument Tsinghua University Beijing100084 China Department of Physics Tsinghua University Beijing100084 China

We reported the realization of a 174Yb+-113Cd+ bi-species Coulomb crystal comprising 174Yb+ ions as coolant and verified its potential for application as a 113Cd+ microwave frequency standard employing sympathetic cooling. The two species of massive ions stably trapped in a Paul trap make up this large two-component crystal. The 113Cd+ ions are trapped in the center, which reduces considerably RF heating and excess micromotion to which the 113Cd+ ions are subjected. Under this scheme, the uncertainty due to the second-order Doppler effect is reduced to 5×10−16, which represents an order of magnitude improvement over sympathetic cooled 40Ca+-113Cd+ crystal. The uncertainty from the second-order Zeeman effect, which contributes the largest uncertainty to the microwave-ion frequency standard, is reduced to 4×10−16. The relevant AC Stark shift uncertainty is estimated to be 4×10−19. These results indicate using 174Yb+ as coolant ions for 113Cd+ is far superior and confirm the feasibility of a sympathetic-cooled cadmium-ion microwave clock system employing a 174Yb+-113Cd+ two-component crystal. Copyright © 2023, The Authors. All rights reserved.

关键词： Uncertainty analysis

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Analysis and Comparison of Optimization Method for Comparator Design

Analysis and Comparison of Optimization Method for Comparato...

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2022 International Conference on Mechanisms and Robotics, ICMAR 2022

作者： Fan, Zhipeng Yang, Zeheng Zhang, Fei School of Electrical Engineering and Computer Science The Pennsylvania State University University Park United States School of Measurement & Control Technology and Instrument Tianjin University Tianjin China Department of Electrical and Electronic Engineering Xi'an Jiaotong-Liverpool University Suzhou China

ISBN: (纸本)9781510657328

The comparator is essential in analog-to-digital converters (ADC). This paper analyzes different improvements in the designs of comparators. In order to improve the energy efficiency, the dynamic bias comparator was developed, and it also reduces the input-referred noise. A floating reservoir design was then adopted to solve some weaknesses of the dynamic bias comparator and further increases energy efficiency. On-chip inductors and charge pumps were also implemented to perfect the performance of the comparator. These two changes improve delay performance, and the first one reduces power consumption simultaneously. The last update was an energy-efficient ring oscillator collapse-based comparator. It adjusts the performance of the comparator without any external control and then makes the energy consumption achieve a minimum value without energy scaling. At the same time, this comparator has a wider resolution tuning capability. © 2022 SPIE.

关键词： Comparators (optical)

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Traffic Vibration Localizing and Analyzing Using Urban Fiber Network

Traffic Vibration Localizing and Analyzing Using Urban Fiber...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Guan Wang Zhongwang Pang Fangmin Wang Yufeng Chen Hongfei Dai Bo Wang Department of Precision Instrument State Key Laboratory of Precision Measurement Technology and Instruments Tsinghua University Beijing China Key Laboratory of Photonic Control Technology (Tsinghua University) Ministry of Education Beijing China

Urban fiber cable is explored as a sensing network to monitor the traffic flow on Beijing Ring Road. Different traffic patterns (including 2022 Winter Olympics) of heavy and light vehicles are observed and analyzed.

ISBN: (纸本)9781957171258

关键词： Cameras Fiber networks Laser interferometry Sensors Vibration

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Particle manipulation behind a turbid medium based on the intensity transmission matrix

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Photonics Research 2022年第10期10卷 2293-2301页

作者： KAIGE LIU HENGKANG ZHANG SHANSHAN DU ZEQI LIU BIN ZHANG XING FU QIANG LIU Key Laboratory of Photonics Control Technology Ministry of EducationTsinghua UniversityBeijing 100084China Department of Precision Instrument State Key Laboratory of Precision Measurement Technology and InstrumentsTsinghua UniversityBeijing 100084China Beijing Institute of Control Engineering Beijing 100190China Beijing Institute of Electronic System Engineering Beijing 100854China

Although optical tweezers can manipulate tiny particles,the distortion caused by the scattering medium restricts their ***-shaping techniques such as the transmission matrix(TM)method are powerful tools to achieve light focusing behind the scattering *** this paper,we propose a method to focus light through a scattering medium in a large area based on the intensity transmission matrix(ITM).Only relying on the intensity distribution,we can calculate the ITM with the number of measurements equal to that of the control *** of the diffraction limit,our method guarantees high energy usage of the light *** on this method,we have implemented particle manipulation with a high degree of freedom on single and multiple *** addition,the manipulation range is enlarged more than 20 times(compared to the memory effect)to 200μm.

关键词： scattering matrix intensity

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Small-size temperature/high-pressure integrated sensor via flip-chip method

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Microsystems & Nanoengineering 2024年第4期10卷 153-162页

作者： Mimi Huang Xiaoyu Wu Libo Zhao Xiangguang Han Yong Xia Yi Gao Zeyu Cui Cheng Zhang Xiaokai Yang Zhixia Qiao Zhikang Li Feng Han Ping Yang Zhuangde Jiang State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesXi’an Jiaotong UniversityXi’an 710049China Xi’an Jiaotong University(Yantai)Research Institute for Intelligent Sensing Technology and System Xi’an Jiaotong UniversityXi’an 710049China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 265503China School of Mechanical Engineering Xi’an Jiaotong University710049 Xi’anChina School of Instrument Science and Technology Xi’an Jiaotong University710049 Xi’anChina Chongqing Key Laboratory of Micro-Nano Systems and Intelligent Sensing Chongqing Academician WorkstationChongqing 2011 Collaborative Innovation Center of Micro/Nano Sensing and Intelligent Ecological Internet of ThingsChongqing Technology and Business UniversityNan’an DistrictChongqing 400067China Xi’an Aerospace Yuanzheng Fluid Control Co.Ltd. Xi’an 710049China

Hydraulic technology with smaller sizes and higher reliability trends,including fault prediction and intelligent control,requires high-performance temperature and pressure-integrated *** designs rely on planar wafer-or chip-level integration,which is limited by pressure range,chip size,and low *** propose a small-size temperature/high-pressure integrated sensor via the flip-chip *** pressure and temperature units are arranged vertically,and the sensing signals of the two units are integrated into one plane through silicon vias and gold–gold bonding,reducing the lateral size and improving the efficiency of signal *** flip-chip technique ensures a reliable electrical connection.A square diaphragm with rounded corners is designed and optimised with simulation to sense high pressure based on the piezoresistive *** temperature sensing unit with a thin-film platinum resistor measures temperature and provides back-end high-precision compensation,which will improve the precision of the pressure *** integrated chip is fabricated by MEMS technology and packaged to fabricate the extremely small integrated *** integrated sensor is characterised,and the pressure sensor exhibits a sensitivity and sensitivity drift of 7.97mV/MPa and−0.19%FS in the range of 0–20 MPa and−40 to 120℃.The linearity,hysteresis,repeatability,accuracy,basic error,and zero-time drift are 0.16%FS,0.04%FS,0.06%FS,0.18%FS,±0.23%FS and 0.04%FS,*** measurement error of the temperature sensor and temperature coefficient of resistance is less than±1°C and 3142.997 ppm/℃,*** integrated sensor has broad applicability in fault diagnosis and safety monitoring of high-end equipment such as automobile detection,industrial equipment,and oil drilling platforms.

关键词： size corners sizes

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Structured light analogy of quantum squeezed states

Structured light analogy of quantum squeezed states

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Wang, Zhaoyang Zhan, Ziyu Vetlugin, Anton N. Ou, Jun-Yu Liu, Qiang Shen, Yijie Fu, Xing Key Laboratory of Photonic Control Technology Tsinghua University Ministry of Education Beijing100084 China State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua University Beijing100084 China Centre for Disruptive Photonic Technologies SPMS TPI Nanyang Technological University 637371 Singapore Optoelectronics Research Centre University of Southampton SouthamptonSO17 IBJ United Kingdom

We demonstrate novel structured light as an analogy of quantum squeezed states, transferring quantum squeezing concepts to characterize optical spatial modes, providing flexible control of deep-subwavelength features ... 详细信息

ISBN: (纸本)9781957171258

关键词： Diffraction

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Atomic magnetometer with microfabricated vapor cells based on coherent population trapping

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Chinese Physics B 2021年第3期30卷 215-219页

作者： Xiaojie Li Yue Shi Hongbo Xue Yong Ruan Yanying Feng State Key Laboratory of Precision Measurement Technology and Instrument Tsinghua UniversityBeijing 100084China Key Laboratory of Photonic Control Technology(Ministry of Education) Tsinghua UniversityBeijing 100084China Department of Precision Instrument Tsinghua UniversityBeijing 100084China State Key Laboratory of Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China MEMS Institute of Zibo National High-tech Industrial Development Zone Zibo 255086China

An atomic magnetometer based on coherent population trapping(CPT) resonances in microfabricated vapor cells is demonstrated. Fabricated by the micro-electro-mechanical-system(MEMS) technology, the cells are filled with Rb and Ne at a controlled pressure. An experimental apparatus is built for characterizing properties of microfabricated vapor cells via the CPT effects. The typical CPT linewidth is measured to be about 3 k Hz(1.46 k Hz with approximately zero laser intensity) for the rubidium D1 line at about 90℃. The effects of pressure, temperature and laser intensity on CPT linewidth are studied experimentally. A closed-loop atomic magnetometer is finally finished with a sensitivity of 210.5 p T/Hz1/2 at 1 Hz bandwidth. This work paves the way for developing an integrated chip-scale atomic magnetometer in the future.

关键词： atomic magnetometer MEMS vapor cell coherent population trapping

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Airy Coherent Vortices towards 3D Self-Accelerating Structured Light

Airy Coherent Vortices towards 3D Self-Accelerating Structur...

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2022 Laser Applications Conference, LAC 2022

作者： Pan, Jing Shen, Yijie Wang, Hao Liu, Qiang Key Laboratory of Photonic Control Technology Tsinghua University Ministry of Education Beijing100084 China State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua University Beijing100084 China Optoelectronics Research Centre University of Southampton SouthamptonSO17 1BJ United Kingdom

We propose and generate a new class of structured light whose wavepackets have 3D inhomogeneous angular velocity evolution with self-accelerating upon both its longitudinal propagation and transverse multilayer rotati... 详细信息

ISBN: (纸本)9781957171203

关键词： Kinematics

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Target Tracking Algorithm Based on Occlusion Prediction

SSRN

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SSRN 2023年

作者： Shang, Qing Zhang, Jin Yan, GuangZong Hong, Lu Zhang, Rui Xia, HaoJie School of Instrument Science and Opto-electronics Engineering Hefei University of Technology Hefei230009 China Anhui Province Key Laboratory of Measuring Theory and Precision Instrument Hefei230009 China Engineering Research Center of Safety Critical Industrial Measurement and Control Technology Ministry of Education Hefei230009 China

Occlusion and similar target interference are one of the most challenging scenes in visual target tracking tasks. At present, the target tracking algorithm based on the Siamese network framework often causes partial or complete loss of the target by using the maximum confidence location strategy. Aiming at the above problems, this paper designs a tracking method based on occlusion prediction and multi-peak response information fusion. At the same time, in order to reduce the interference of similar targets, a dynamically adjusted background suppression method is designed. First, the input image is processed by dynamic background suppression. Then, the maximum confidence point and local peak point are obtained by using the classification response map output by the network, and the final target position is obtained by fusing the occlusion prediction information and local peak point position information to correct the target position. The experimental results show that this method has a good effect in dealing with target occlusion interference. In the interference test based on OTB data set, applying this method to SiamBan and SiamGat can achieve a maximum tracking success rate of about 7% and a tracking accuracy improvement of 10%. © 2023, The Authors. All rights reserved.

关键词： Forecasting

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A Method for Improving SLAM Localization Accuracy Based on Point-Line Feature

SSRN

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SSRN 2023年

作者： Pei, Haodong Zhang, Jin Hong, Lu Zhang, Rui Li, Weishi Xia, Haojie School of Instrument Science and Opto-electronics Engineering Hefei University of Technology Hefei230009 China Anhui Province Key Laboratory of Measuring Theory and Precision Instrument Hefei230009 China Engineering Research Center of Safety Critical Industrial Measurement and Control Technology Ministry of Education Hefei230009 China

In this article, we propose a visual SLAM positioning accuracy improvement method based on point and line features. Our method leverages the perspective and photometric invariance of point features and the local gradient adaptability of line features to handle low-texture and repetitive-texture scenarios, where point features alone are not reliable. However, line features may suffer from endpoint uncertainty due to occlusion and other factors, which affects the re-projection error calculation based on their direction vectors. This leads to some line features degrading along the camera direction. To tackle this issue, we analyze the causes of line feature degradation and propose a method to identify and filter out these degraded line features. We evaluate our method on the TUM RGB-D benchmark and a real dataset and show that it can effectively reduce the trajectory error of visual SLAM based on point and line features. © 2023, The Authors. All rights reserved.

关键词： Textures

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