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2015 International Conference on Fluid Power and Mechatronics

作者： Yunxiao Hao Jiahai Huang Wenyong Li Long Quan Bin Zhao Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Educationand Shanxi ProvinceTaiyuan University of Technology

Cartridge flow valves, widely applied in heavy machine and equipment, have the advantages of low leakage, large flow capacity, and simple structure. However, in the existence technologies, in order to reduce the influence of load variety on valve flow, a pressure differential compensator or a cartridge type flow sensor should be added to proportional throttle valve. This method reduces valve flow capacity and increases system throttling loss. In large flow occasion, flow only can be indirectly controlled by changing valve opening area for the limitation of the structure. So a low energy consumption, high controllable electro-hydraulic proportional valve which is structured by a hydraulic transistor(Valvistor) and a small displacement hydraulic pump driven by a servo motor is introduced. Based on the Valvistor valve flow amplification principle, main valve flow is controlled by pilot pump flow which is controlled by changing rotation speed without the influence of load variety. In the research, it's known from the analysis of the new principle valve steady flow characteristics that feedback throttle slot pre-opening will cause the decrease of the main valve flow as pressure drop increases. Soa method of pressure differential-pilot pump rotation speed compensation is put forward and it can obtain ideal flow characteristic. Then the dynamic mathematical model is established and the main valve stability criterion is derived. The influence of the valve parameters on main valve performance is analyzed and simulated. The results provide a new method forthe large flow electro-hydraulic proportional control system.

关键词： Valvistor Proportional flow control valve Pressure differential-rotation speed compensation Steady state characteristics

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Large-range Dynamic Strain Measurement Using Chaotic BOCDA

Large-range Dynamic Strain Measurement Using Chaotic BOCDA

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International Conference on Optical Communications and Networks (ICOCN)

作者： Yahui Wang Le Zhao Mingjiang Zhang Jianzhong Zhang Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan China

We propose and demonstrate a wide-range dynamic strain measurement system using single-slope assisted chaotic BOCDA. In SBS-based chaotic sensors, the linewidth of chaotic BGS is naturally broaden due to the multi-frequency pump wave. Thus, the linear section is provided a large dynamic range. This experiment is the first that a dynamic strain of 1200 με can be accurately identified using the single-slope assisted method, which is a significant improvement. The proposed method has a great demand potential in large-scale dynamic strain measurement.

关键词： Strain Strain measurement Frequency measurement Probes Scattering Optical fibers Chaotic communication

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Distributed sensor diagnosis for wire fault of complex topology wired networks based on chaos-TDR

Distributed sensor diagnosis for wire fault of complex topol...

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Progress in Electromagnetic Research Symposium (PIERS)

作者： Bingjie Wang Hang Xu Yuncai Wang Guanghui Wu Li Liu Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province Taiyuan 030024 China

ISBN: (纸本)9781509060948

The growing need for wiring in avionics, automotive, telecommunications, nuclear plants, buildings, etc., has caused the increase of the complexity of wired networks. This also leads to the increase of the difficulty of their maintenance that becomes not only problematic but also expensive. The need of embedded diagnosis to perform continuous monitoring was identified. Although reflectometry is an efficient method to diagnose simple topologies, it remains limited in the case of complex branched networks due to multipath fading of the test signal during its propagation. In practice, a distributed diagnosis strategry is necessary when multiple reflectometers (referred as diagnosis sensors) at several points of a complex network at the same time, thus allowing to solve ambiguities due to the existence of multiple paths and to guarantee a reliable and continuous diagnosis in complex wiring system. In this paper, the use of chaotic signals for distributed diagnosis and the detection of defects in the complex wiring network is presented experimentally. Chaos time-domain reflectometry (chaos-TDR) using low auto-correlation sidelobes signals, shows high performances in very noisy environment and is a suitable candidate for on-line diagnosis. Low cross-correlation chaotic signals enable several reflectometers (sensors) to simultaneously inject their signals in the cables, without any interference. Experimental results show that the proposed method performs well in a branched wiring network as it permits to detect and locate faults accurately even when the target system is operating. Also, the inference of wired network topology is realized by using sensor measurements at multiple cable ends.

关键词： Wiring Network topology Topology Electromagnetics Wires transducers intelligent control

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Lead-free perovskite Cs_(2)AgBiBr_(6)photodetector detecting NIR light driven by titanium nitride plasmonic hot holes

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Photonics Research 2024年第3期12卷 522-533页

作者： ZIJIAN LIU YUYING XI WENBO ZENG TING JI WENYAN WANG SITONG GUO LINLIN SHI RONG WEN YANXIA CUI GUOHUI LI College of Physics College of Electronic Information and Optical EngineeringKey Laboratory of Advanced Transducers and Intelligent Control System of Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032China

Lead-free perovskite Cs_(2)AgBiBr_(6)manifests great potential in developing high-performance,environmentally friendly,solution-processable photodetectors(PDs).However,due to the relatively large energy bandgap,the spectrum responses of Cs_(2)AgBiBr_(6)PDs are limited to the ultraviolet and visible region with wavelengths shorter than 560 *** this work,a broadband Cs_(2)AgBiBr_(6)PD covering the ultraviolet,visible,and near infrared(NIR)range is demonstrated by incorporating titanium nitride(TiN)nanoparticles that are prepared with the assistance of self-assembled polystyrene sphere *** addition,an atomically thick Al2O3layer is introduced at the interface between the Cs_(2)AgBiBr_(6)film and TiN nanoparticles to alleviate the dark current deterioration caused by nanoparticle *** a result,beyond the spectrum range where Cs_(2)AgBiBr_(6)absorbs light,the external quantum efficiency(EQE)of the TiN nanoparticle incorporated Cs_(2)AgBiBr_(6)PD is enhanced significantly compared with that of the control,displaying enhancement factors as high as 2000 over a broadband NIR wavelength *** demonstrated enhancement in EQE arises from the photocurrent contribution of plasmonic hot holes injected from TiN nanoparticles into Cs_(2)AgBiBr_(6).This work promotes the development of broadband solution-processable perovskite PDs,providing a promising strategy for realizing photodetection in the NIR region.

关键词： perovskite titanium ultraviolet

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Coal mine water monitoring system based on CAN bus

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International Journal of Advancements in Computing Technology 2012年第23期4卷 309-318页

作者： Jin, Baoquan Zhao, Yuanpeng Li, Jin Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan China

Aiming at the drawbacks of the existing mine water level monitoring system, a new set of water level monitoring system are developed, this system can cover the entire coal mine working environment. The mine substations are designed with single chip microcomputers MSP430F169 as their core processors. The system uses the CAN bus communication to communicate among devices. After compared the existing CAN controller and transceiver, the chip MCP2515 is selected as CAN controller and the chip TJA1040 is used as CAN transceivers to constitute the CAN bus communication modules, achieving the technical function that sending and receiving messages through the CAN bus. Studies show that the CAN bus communication has greatly improved the accuracy rate of data transmission, has efficiently connected the underlying devices, making the barrier-free transmission of information among monitoring systems has met the requirements of field use.

关键词： Monitoring

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Distributed fiber temperature sensor using a laser diode modulated by a pseudo-random bit sequence

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Chinese Optics Letters 2015年第8期13卷 23-26页

作者：柴晶张明江刘毅李岚许卫鹏王云才 Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceTaiyuan University of Technology Institute of Optoelectronic Engineering College of Physics and OptoelectronicsTaiyuan University of Technology

We propose and demonstrate a scheme to measure the distribution of temperature along an optical fiber based on pseudo-random sequence modulation. In our experimental work, current modulation with a pseudo-random bit sequence （PRBS） is applied to a laser diode that serves as the Brillouin pump light and reference light. Because of the independence of the spatial resolution on the PRBS length~ the measurement range can be extended while maintaining high spatial resolution using a long PRBS length. Temperature-induced changes in a Brillouin frequency shift of 250 m fiber sections are clearly observed with 54 cm spatial resolution by this method.

关键词： Image resolution Modulation Optical fibers

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Novel distributed fiber Raman sensor and its application

Novel distributed fiber Raman sensor and its application

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2019 International Conference on Optical Instruments and Technology: Optical Sensor and Applications

作者： Zhang, Mingjiang Li, Jian Zhang, Jianzhong Qiao, Lijun Wang, Tao College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan030024 China Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province Taiyuan University of Technology Taiyuan030024 China

ISBN: (纸本)9781510636507

We proposed and experimentally demonstrated a distributed optic-fiber sensor based on the Raman loop configuration and fiber loss characteristic for detecting the temperature and structure's crack. Among them, the Raman loop configuration with reference fiber is proposed to detect the temperature profile along the sensing fiber. It can eliminate the influence of external physical perturbation on the temperature measurement results, and don't require pre-calibration process before measurement. This proposed method improves the engineering applicability of optic-fiber sensors. In addition, the information of crack is detected by using the fiber loss characteristics based on OTDR technology. © 2020 SPIE.

关键词： Temperature measurement

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A novel anti-theft alarm system b ased on detection of magnetic field

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Journal of Measurement Science and Instrumentation 2013年第2期4卷 175-179页

作者：邓丽莉桑胜波张文栋唐晓亮李朋伟胡杰李刚 MircoNano System Research Center Taiyuan Unive rsity of Technology Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of EducationTaiyuan University of Technology

This paper proposes a novel bidirect i o nal anti-theft alarm scheme through detecting the magnetic *** theoretical background and analysis of the approach of anti-theft alarm are pre *** circuit of burglar alarm is designed,fabricated and tested,and C language program is implemented and *** of the de veloped scheme is proved by the experiments.

关键词： anti-theft alarm magnetic field C language

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Ultrafast multi-target control of tightly focused light fields

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Opto-Electronic Advances 2022年第3期5卷 76-87页

作者： Yanxiang Zhang Xiaofei Liu Han Lin Dan Wang Ensi Cao Shaoding Liu Zhongquan Nie Baohua Jia Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceCollege of Physics and OptoelectronicsTaiyuan University of TechnologyTaiyuan 030024China Department of Physics Harbin Institute of TechnologyHarbin 150001China Centre of Translational Atomaterials(CTAM) Faculty of ScienceEngineering and TechnologySwinburne University of TechnologyHawthornVIC 3122Australia

The control of ultrafast optical field is of great interest in developing ultrafast optics as well as the investigation on vari-ous light-matter interactions with ultrashort ***,conventional spatial encoding approaches have only lim-ited steerable targets usually neglecting the temporal effect,thus hindering their broad *** we present a new concept for realizing ultrafast modulation of multi-target focal fields based on the facile combination of time-depend-ent vectorial diffraction theory with fast Fourier *** is achieved by focusing femtosecond pulsed light carrying vectorial-vortex by a single objective lens under tight focusing *** is uncovered that the ultrafast temporal de-gree of freedom within a configurable temporal duration(~400 fs)plays a pivotal role in determining the rich and exotic features of the focused optical field at one time,namely,bright-dark alternation,periodic rotation,and longitudinal/trans-verse polarization *** underlying control mechanisms have been *** being of academic in-terest in diverse ultrafast spectral regimes,these peculiar behaviors of the space-time evolutionary beams may underpin prolific ultrafast-related applications such as multifunctional integrated optical chip,high-efficiency laser trapping,micro-structure rotation,super-resolution optical microscopy,precise optical measurement,and liveness tracking.

关键词： ultrafast optical field vectorial diffraction theory fast Fourier transform vectorial vortex beam space-time shaping

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Experimental investigation of a UWB direct chaotic through-wall imaging radar using colpitts oscillator

Experimental investigation of a UWB direct chaotic through-w...

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IET International Radar Conference 2015

作者： L. Liu R. X. Ma H. Xu W. K. Wang B. J. Wang J. X. Li Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province

ISBN: (纸本)9781510822023

An ultra-wideband direct chaotic through-wall imaging radar is proposed and experimentally demonstrated. The chaotic signal is generated by an improved Colpitts oscillator. Target range information is achieved by the cross-correlation between the time-delayed reflected echo signal and the replica of the transmitted chaotic signal. Two-dimensional image is obtained by synthetic aperture technology and back projection algorithm. Experimental results of single target and double targets show that the proposed chaotic radar system can through 20cm thick wall to detect and locate the target.

关键词： Through-wall radar Chaotic radar UWB Colpitts oscillator Synthetic aperture

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