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Robust far-field imaging by spatial coherence engineering

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Opto-Electronic Advances 2021年第12期4卷 15-24页

作者： Yonglei Liu Yahong Chen Fei Wang Yangjian Cai chunhao liang Olga Korotkova Shandong Provincial Engineering and Technical Center of Light Manipulations&Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250014China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China School of Physical Science and Technology Soochow UniversitySuzhou 215006China Department of Physics University of MiamiCoral GablesFlorida 33146USA.

The degree of coherence(DOC)function that characterizes the second-order correlations at any two points in a light field is shown to provide a new degree of freedom for carrying *** a rule,the DOC varies along the beam propagation path,preventing from the efficient information *** this paper,we report that when a partially coher-ent beam carrying a cross phase propagates in free space,in a paraxial optical system or in a turbulent medium,the modulus of the far-field(focal plane)DOC acquires the same value as it has in the source *** unique propaga-tion feature is employed in a novel protocol for far-field imaging via the DOC,applicable to transmission in both free-space and *** advantages of the proposed approach are the confidentiality and resistance to turbulence,as well as the weaker requirement for the beam alignment *** demonstrate the feasibility and the robustness of the far-field imaging via the DOC in the turbulent media through both the experiment and the numerical *** findings have potential applications in optical imaging and remote sensing in natural environments,in the presence of op-tical turbulence.

关键词： degree of coherence cross phase optical imaging

Measurement of optical coherence structures of random optical fields using generalized Arago spot experiment

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Opto-Electronic Science 2023年第2期2卷 27-35页

作者： Xin Liu Qian Chen Jun Zeng Yangjian Cai chunhao liang Shandong Provincial Engineering and Technical Center of Light Manipulation&Shandong Provincial Key Laboratory of Optics and Photonic Devices School of Physics and ElectronicsShandong Normal UniversityJinan 250014China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

The optical coherence structures of random optical fields can determine beam propagation behavior,light–matter interactions,*** performance makes a light beam robust against turbulence,scattering,and ***,we proposed optical coherence encryption and robust far-field optical imaging *** related applications place a high demand on precision in the experimental measurements of complex optical coherence structures,including their real and imaginary *** studies on these measurements have mainly adopted theoretical mathematical approximations,limited to Gaussian statistic involving speckle statistic(time-consuming),or used complicated and delicate optical systems in the *** this study,we provide:a robust,convenient,and fast protocol to measure the optical coherence structures of random optical fields via generalized Arago(or Poisson)spot experiments with rigorous mathematical *** proposal only requires to capture the intensity thrice,and is applicable to any optical coherence structures,regardless of their type or optical *** theoretical and experimental results demonstrated that the real and imaginary parts of the structures could be simultaneously recovered with high *** believe that such a protocol can be widely employed in phase measurement,optical imaging,and image transfer.

关键词： optical coherence statistical optics Arago spot optical encryption optical imaging

东曲矿28202工作面高抽巷抽放瓦斯技术试验研究

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中国煤炭 2013年第12期39卷 115-119页

作者：梁春豪山西焦煤(集团)有限责任公司山西省太原市030053

针对西山煤电集团东曲矿工作面绝对瓦斯涌出量不断增大、瓦斯经常达到临界报警范围,而现有的通风方法和钻孔抽放方式已不能有效解决瓦斯超限问题,以东曲矿+860 m水平高瓦斯工作面为研究对象,采用高抽巷抽放瓦斯技术在28202工作面进行了... 详细信息

针对西山煤电集团东曲矿工作面绝对瓦斯涌出量不断增大、瓦斯经常达到临界报警范围,而现有的通风方法和钻孔抽放方式已不能有效解决瓦斯超限问题,以东曲矿+860 m水平高瓦斯工作面为研究对象,采用高抽巷抽放瓦斯技术在28202工作面进行了现场试验研究,对其抽放效果和经济效益进行了分析,为最终确定合理的高抽巷位置提供了依据。

关键词：瓦斯高抽巷布置瓦斯超限抽放量瓦斯浓度

Optimizing illumination's complex coherence state for overcoming Rayleigh's resolution limit

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Chinese Optics Letters 2021年第5期19卷 65-70页

作者： chunhao liang Yashar E.Monfared Xin Liu Baoxin Qi Fei Wang Olga Korotkova Yangjian Cai Shandong Provincial Engineering and Technical Center of Light Manipulations&Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250014China Department of Chemistry Dalhousie UniversityHalifaxNS B3H 4R2Canada School of Physical Science and Technology&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow UniversitySuzhou 215006China Department of Physics University of MiamiCoral GablesFlorida 33146USA

We suggest tailoring of the illumination's complex degree of coherence for imaging specific two-and three-point objects with resolution far exceeding the Rayleigh *** first derive a formula for the image intensity via the pseudo-mode decomposition and the fast Fourier transform valid for any partially coherent illumination(Schell-like,non-uniformly correlated,twisted)and then show how it can be used for numerical image ***,for Schell-model sources,we show the improvement of the two-and three-point resolution to 20%and 40%of the classic Rayleigh distance,respectively.

关键词： optical coherence imaging light manipulation

Robust measurement of orbital angular momentum of a partially coherent vortex beam under amplitude and phase perturbations

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Opto-Electronic Science 2024年第1期3卷 1-12页

作者： Zhao Zhang Gaoyuan Li Yonglei Liu Haiyun Wang Bernhard J.Hoenders chunhao liang Yangjian Cai Jun Zeng Shandong Provincial Engineering and Technical Center of Light Manipulations&Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250358China Collaborative Innovation Center of Light Manipulation and Applications Shandong Normal UniversityJinan 250358China School of Physical Science and Technology Soochow UniversitySuzhou 215006China School of Physical Science and Technology Suzhou University of Science and TechnologySuzhou 215009China Zernike Institute for Advanced Materials University of GroningenNijenborgh 4NL-9747 AG GroningenThe Netherlands Joint Research Center of Light Manipulation Science and Photonic Integrated Chip of East China Normal University and Shandong Normal University East China Normal UniversityShanghai 200241China

The ability to overcome the negative effects,induced by obstacles and turbulent atmosphere,is a core challenge of long-distance information transmission,and it is of great significance in free-space optical *** spatial-coherence structure,that characterizes partially coherent fields,provides a new degree of freedom for carrying ***,due to the influence of the complex transmission environment,the spatial-coherence structure is severely damaged during the propagation path,which undoubtedly limits its ability to transmit ***,we realize the robust far-field orbital angular momentum(OAM)transmission and detection by modulating the spatial-coherence structure of a partially coherent vortex beam with the help of the *** cross-phase enables the OAM information,quantified by the topological charge,hidden in the spatial-coherence structure can be stably transmitted to the far field and can resist the influence of obstructions and turbulence within the communication *** is due to the self-reconstruction property of the spatial-coherence structure embedded with the *** demonstrate experimentally that the topological charge information can be recognized well by measuring the spatial-coherence structure in the far field,exhibiting a set of distinct and separated dark rings even under amplitude and phase *** findings open a door for robust optical signal transmission through the complex environment and may find application in optical communication through a turbulent atmosphere.

关键词： degree of coherence orbital angular momentum cross-phase topological charge information transmission

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桥梁施工期桩顶轴力实测分析

铁道建筑 2016年第4期56卷 38-40页

作者：梁纯皓陈志坚河海大学地球科学与工程学院江苏南京211100

对于桥梁桩基础,桩顶的受力情况会影响桩身的受力,关系到桩基础的安全性和稳定性。本文以苏通大桥桩基础为例,基于施工期的实测数据,对桥梁桩基础桩顶轴力进行分析。分析结果表明,施工过程对桩顶轴力影响非常大,由于受到群桩效应的影响... 详细信息

对于桥梁桩基础,桩顶的受力情况会影响桩身的受力,关系到桩基础的安全性和稳定性。本文以苏通大桥桩基础为例,基于施工期的实测数据,对桥梁桩基础桩顶轴力进行分析。分析结果表明,施工过程对桩顶轴力影响非常大,由于受到群桩效应的影响,桥梁桩基础在施工期受力并不均匀。分析结果可为今后桥梁施工期的桩基础设计提供参考。

关键词：桩顶轴力实测数据小波理论群桩效应

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薄煤层工作面自动化控制仿真技术研究

煤矿机械 2021年第12期42卷 47-51页

作者：梁椿豪华晋焦煤有限责任公司山西吕梁033099

薄煤层工作面设备稳定性直接关系到整个自动化系统的稳定运行,不仅受外部薄煤层采面煤岩的影响,还与薄煤层三机的协同工作过程密切相关。各设备的稳定运行是保证自动化准确实施的前提,因此以工作面设备自动化控制技术为控制模型,利用Sol... 详细信息

薄煤层工作面设备稳定性直接关系到整个自动化系统的稳定运行,不仅受外部薄煤层采面煤岩的影响,还与薄煤层三机的协同工作过程密切相关。各设备的稳定运行是保证自动化准确实施的前提,因此以工作面设备自动化控制技术为控制模型,利用Solid Works进行建模,将建立好的采煤机、液压支架和刮板输送机三维模型导入ADAMS中进行仿真分析,验证各项控制技术在薄煤层工况下的适应性。研究表明,薄煤层液压支架满足降-移-升控制过程要求的精确度和适应性要求,刮板输送机推移过程碰撞减少、速度稳定,能够满足薄煤层工作面自动化控制要求,有效解决薄煤层工作面自动化水平不高的问题。

关键词：薄煤层自动化控制采煤机液压支架刮板输送机仿真分析

近距离自燃煤层110工法开采防灭火技术研究

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煤炭技术 2022年第3期41卷 144-147页

作者：梁椿豪姜小强刘毅华晋焦煤有限责任公司党委山西吕梁033000 华晋焦煤有限责任公司山西吕梁033000

为解决4303工作面110工法无煤柱开采条件下,受上覆近距离自燃煤层、"Y"通风及多源抽采环境影响,采空区存在自然发火的问题,基于瓦斯与火平衡防控的思想,在煤自燃监测预报为基础上,采取了留巷喷浆、压注水溶性胶体、柔模混凝土充填等多... 详细信息

为解决4303工作面110工法无煤柱开采条件下,受上覆近距离自燃煤层、"Y"通风及多源抽采环境影响,采空区存在自然发火的问题,基于瓦斯与火平衡防控的思想,在煤自燃监测预报为基础上,采取了留巷喷浆、压注水溶性胶体、柔模混凝土充填等多源堵漏措施,并应用了采空区注氮、灌注三(两)相泡沫等综合防灭火技术。现场应用表明:以"堵"与"隔氧"相结合的控制措施,使采空区氧化带宽度缩短了70 m,采空区氧化带内CO控制在0.005%以下,工作面及其回风流的空气中未检测到CO,有效防控了采空区遗煤自然发火隐患。

关键词：自燃煤层 110工法多源堵漏综合防灭火

基于多信息融合的采煤机采运参数协同优化研究

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煤矿机械 2022年第2期43卷 190-192页

作者：梁椿豪华晋焦煤有限责任公司山西吕梁033000

以煤岩的相关材料理论为基础,建立煤岩截割三维模型,利用有限元分软件ANSYS对该模型进行仿真。研究了转速和牵引速度与载荷波动系数、截割比能耗、截齿安全系数的关系,得到载荷波动系数、截割比能耗、截齿安全系数的关系式,通过fmincon... 详细信息

以煤岩的相关材料理论为基础,建立煤岩截割三维模型,利用有限元分软件ANSYS对该模型进行仿真。研究了转速和牵引速度与载荷波动系数、截割比能耗、截齿安全系数的关系,得到载荷波动系数、截割比能耗、截齿安全系数的关系式,通过fmincon函数得出结果:当转速为86.2 r/min、牵引速度为3.85 m/min时,采煤机运动参数达到最佳,此时载荷波动系数为0.271,截能比耗为0.785 kW·h/m^(3),截齿安全系数为2.4。

关键词：煤岩 ANSYS fmincon 多目标优化