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Improving long-term temperature bias stability of an integrated optical gyroscope employing a Si_(3)N_(4)resonator

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Photonics Research 2022年第7期10卷 1661-1668页

作者： CHANGKUN feng YONGGUI ZHANG HONGHAO MA HUI LI lishuang feng School of Instrumentation and Optoelectronics Engineering Beihang UniversityBeijing 100191China

The presence of polarization noise generated by the waveguide resonator limits the performance of a resonant integrated optical gyroscope(RIOG).Using silicon nitride(Si_(3)N_(4))to fabricate a waveguide with an ultralowaspect-ratio can result in a resonator that only supports light transmission in a single-polarization state,suppressing polarization *** successfully fabricated a Si_(3)N_(4)resonator with a bending radius of 17.5 mm,a finesse(F)of 150,a quality factor(Q)of 1.54×10^(7),and a propagation loss of 1.2 d B/*** Si_(3)N_(4)resonator was used to construct a double closed-loop RIOG that showed long-term bias stability(3600 s)of 13.2°/h at room temperature,14.8°/h at 40℃,21.2°/h at 50℃,and 23.6°/h at 60℃.We believe this to be the best performance reported to date for a Si_(3)N_(4)resonator-based *** advancement paves the way for the wider application of RIOGs.

关键词： resonator polarization waveguide

Three-Dimensional Planar Metallic Lenses Based on Concentric Rings with Modulated Subwavelength Width

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Journal of Electromagnetic Analysis and Applications 2012年第12期4卷 485-491页

作者： Di feng Chunxi Zhang lishuang feng Yuanhong Yang School of Instrumentation Science and Optoelectronics Engineering Beihang University Beijing China

A kind of Subwavelength Planar Metallic Lenses (SPMLs) is proposed to realize far-field optical focusing in the visible range based on concentric rings with modulated width in a silver film. The width of each metallic ring is mutative so that the radiation fields of surface plasmon polaritons can be controlled and the relevant phase retardations can be modulated to make a beam focus at the desired position. For comparison, the Subwavelength Planar Dielectric Lenses (SPDLs) structured on silica glass with the same concentric ring shapes as SPMLs are analyzed, although without opaque metal coating on SPDLs, the computational results show that SPMLs can support higher intensity focal spot, narrower full-width half-maximum beam width, and longer depth of focus at the focal region under certain lens thickness due to the coupling of surface plasomon polaritons, diffracted evanescent waves and propagated electromagnetic waves.

关键词： Subwavelength Structures Focus Surface Plasmons Diffractive Lenses

Silica-modified Pt/TiO_(2) catalysts with tunable suppression of strong metal-support interaction for cinnamaldehyde hydrogenation

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Chinese Journal of Chemical Engineering 2024年第6期70卷 189-198页

作者： Zhengjian Hou Yuanyuan Zhu Hua Chi Li Zhao Huijie Wei Yanyan Xi lishuang Ma Xiang feng Xufeng Lin College of Chemistry and Chemical Engineering China University of Petroleum(East China)Qingdao 266580China Advanced Chemical Engineering and Energy Materials Research Center China University of Petroleum(East China)Qingdao 266580China State Key Laboratory of Heavy Oil Processing China University of Petroleum(East China)Qingdao 266580China

Tuning Strong Metal-support Interactions(SMSI)is a key strategy to obtain highly active catalysts,but conventional methods usually enable TiO_(x) encapsulation of noble metal components to minimize the exposure of noble *** study demonstrates a catalyst preparation method to modulate a weak encapsulation of Pt metal nanoparticles(NPs)with the supported TiO_(2),achieving the moderate suppression of SMSI *** introduction of silica inhibits this encapsulation,as reflected in the characterization results such as XPS and HRTEM,while the Ti^(4+) to Ti^(3+) conversion due to SMSI can still be found on the support ***,the hydrogenation of cinnamaldehyde(CAL)as a probe reaction revealed that once this encapsulation behavior was suppressed,the adsorption capacity of the catalyst for small molecules like H_(2) and CO was enhanced,which thereby improved the catalytic activity and facilitated the hydrogenation of ***,the introduction of SiO_(2) also changed the surface structure of the catalyst,which inhibited the occurrence of the acetal reaction and improved the conversion efficiency of C=O and C=C *** manipulation of SMSI formation and its consequence on the performance in catalytic hydrogenation reactions are discussed.

关键词： Pt catalyst Silica modification Hydrogenation Cinnamaldehyde Strong metal-support interaction

Dynamic Free-Spectral-Range Measurement for Fiber Resonator Based on Digital-Heterodyne Optical Phase-Locked Loop

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Optics and Photonics Journal 2021年第8期11卷 332-340页

作者： Hongchen Jiao Tao Wang Heli Gao lishuang feng Honghao Ma Institute of Remote Sensing Satellite China Academy of Space Technology Beijing China Precision Opto-Mechatronics Technology Key Laboratory of Education Ministry Beihang University Beijing China

We propose a novel scheme, based on digital-heterodyne optical phase-locked loop with whole-fiber circuit, to dynamically measure the free-spectral-range of a fiber resonator. The optical phase-locked loop is established with a differential frequency-modulation module consists of a pair of acousto-optic modulators. The resonance-tracking loop is derived with the Pound-Drever-Hall technique for locking the heterodyne frequency of the OPLL on the frequency difference between adjacent resonance modes. A stable locking accuracy of about 7 × 10?9 and a dynamic locking accuracy of about 5 × 10?8 are achieved with the FSR of 8.155 MHz, indicating a bias stability of the resonator fiber optic gyro of about 0.1?/h with 10 Hz bandwidth. In addition, the thermal drift coefficient of the FSR is measured as 0.1 Hz/?C. This shows remarkable potential for realizing advanced optical measurement systems, such as the resonant fiber optic gyro, and so on.

关键词： Free Spectral Range Fiber Resonator Dynamic Measurement Digital-Heterodyne Optical Phase-Locked Loop Resonant Fiber Optic Gyro

Design of Quasi-planar Ridge SOI Waveguide Resonator for Integrated Optical Gyro

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Design of Quasi-planar Ridge SOI Waveguide Resonator for Int...

双绞式受抑全内反射无源光纤液位传感系统设计（英文）

中国材料大会2012

作者： Kunbo Wang lishuang feng Zhengfang Dong Laboratory on Inertial Science and Technology Beihang University Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education) Beihang University

ISBN: (纸本)9783037856079

In order to realize the opto-electronic integration of optic gyro, the quasi-planar ridge SOI waveguide resonator is proposed due to its low loss and small bend radius. First, the single mode condition and smallest bend radius were simulated by using the 3-dimension finite difference beam propagation method （3-D BPM）. Then the relationship between the sensitivity of gyro and the resonator characteristics, such as radius and coupling coefficient, was analyzed by applying the model of the integrated optical gyro. Based on these simulations, the ridge height and width of the waveguide were 220 nm and 1.2 μmrespectively and the smallest bend radius was 600μm. It is shown that the theoretical detection limit of the gyro was 0.031 °/s when the resonator diameter was 5cm and the coupler’s splitting ratio was 46.7:53.3. This gyro system is suitable for tactical and civil applications.

关键词： Integrated optics Waveguide Resonator Gyroscope SOI Quasi-planar

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红外与激光工程 2017年第12期46卷 171-176页

作者：张会新冯丽爽北京航空航天大学惯性技术重点实验室北京100191 北京航空航天大学精密光机电一体化技术教育部重点实验室北京100191 中北大学仪器科学与动态测试技术教育部重点实验室山西太原030051 中北大学电子测试技术重点实验室山西太原030051

为满足某些国家工程的发展需要,比如说航天领域内,液态燃料液位监测作为飞行指标考核的一个关键参数,检测精度直接影响到各类飞行器的指标实现效率。基于塑料光纤弯曲损耗和受抑全内反原理,设计了一种可实现单点离散与多点连续的液位传... 详细信息

为满足某些国家工程的发展需要,比如说航天领域内,液态燃料液位监测作为飞行指标考核的一个关键参数,检测精度直接影响到各类飞行器的指标实现效率。基于塑料光纤弯曲损耗和受抑全内反原理,设计了一种可实现单点离散与多点连续的液位传感系统。理论分析后,使用实际器材验证理论分析,阐述了操作原则、系统结构和技术优势,分析了进行液位测量的可行性。根据理论分析的结果,基于已有器材搭建了离散和连续式液位传感系统,同时设计了一套实验装置并利用该装置对传感系统进行了验证实验。实验结果表明:所提出的新型液位传感系统不仅可以实现液位的测量,而且具有较好的测量一致性和易实现性。其中连续液位测量系统达到了测试量程450 mm,测试灵敏度为0.808 3μW/mm的液位测量。对工程应用领域的具有较好的参考意义。

关键词：光纤液位传感光纤光学弯曲受抑全内反射

Dynamic Free-Spectral-Range Measurement for Fiber Resonator Based on Digital-Heterodyne Optical Phase-Locked Loop

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Dynamic Free-Spectral-Range Measurement for Fiber Resonator ...

作者： Hongchen Jiao Tao Wang Heli Gao lishuang feng Honghao Ma Institute of Remote Sensing Satellite China Academy of Space Technology Precision Opto-Mechatronics Technology Key Laboratory of Education MinistryBeihang University

We propose a novel scheme,based on digital-heterodyne optical phase-locked loop with whole-fiber circuit,to dynamically measure the free-spectral-range of a fiber *** optical phase-locked loop is established with a differential frequency-modulation module consists of a pair of acousto-optic *** resonance-tracking loop is derived with the Pound-Drever-Hall technique for locking the heterodyne frequency of the OPLL on the frequency difference between adjacent resonance modes.A stable locking accuracy of about 7×10 and a dynamic locking accuracy of about 5×10 are achieved with the FSR of 8.155 MHz,indicating a bias stability of the resonator fiber optic gyro of about 0.1°/h with 10 Hz *** addition,the thermal drift coefficient of the FSR is measured as 0.1 Hz/℃.This shows remarkable potential for realizing advanced optical measurement systems,such as the resonant fiber optic gyro,and so on.

关键词： Free Spectral Range Fiber Resonator Dynamic Measurement Digital-Heterodyne Optical Phase-Locked Loop Resonant Fiber Optic Gyro

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新型石英振梁加速度计机械耦合研究

红外与激光工程 2013年第S2期42卷 426-430页

作者：史杰周震姚保寅冯丽爽北京航空航天大学仪器科学与光电工程学院北京100191

机械耦合效应严重制约了一体差动式振梁加速度的精度提高。为了降低机械耦合效应,提高加速度测量精度,设计了一种新型一体差动式石英振梁加速度计敏感头。首先,介绍了机械耦合效应所引起的"锁频"问题,建立了机械耦合效应数学建模。其次... 详细信息

机械耦合效应严重制约了一体差动式振梁加速度的精度提高。为了降低机械耦合效应,提高加速度测量精度,设计了一种新型一体差动式石英振梁加速度计敏感头。首先,介绍了机械耦合效应所引起的"锁频"问题,建立了机械耦合效应数学建模。其次,依据机械耦合数学模型,对加速度计敏感结构进行优化。最后,通过有限元方法进行仿真,验证了理论设计的合理性。实验证明:新型一体差动式石英振梁加速度计具有低机械耦合效应、高灵敏度、小型化等优点。

关键词：一体差动式加速度计灵敏度机械耦合有限元仿真

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微米光栅加速度计的加工与性能研究(英文)

强激光与粒子束 2015年第2期27卷 251-256页

作者：冯丽爽姚保寅刘惟芳王潇北京航空航天大学精密光机电一体化技术教育部重点实验室北京100191 北京航空航天大学新型惯性仪表与导航系统技术国防重点学科实验室北京100191

介绍了一种以微米衍射光栅为敏感元件的微机电加速度计敏感头的加工和性能。硅质量块底部加工有铝反射膜,透明玻璃基底上制作有金微米光栅,中间为空气腔,经硅玻璃阳极键合,构成敏感头的核心敏感部件。光源透过透明基底,照射在光栅上,在... 详细信息

介绍了一种以微米衍射光栅为敏感元件的微机电加速度计敏感头的加工和性能。硅质量块底部加工有铝反射膜,透明玻璃基底上制作有金微米光栅,中间为空气腔,经硅玻璃阳极键合,构成敏感头的核心敏感部件。光源透过透明基底,照射在光栅上,在反射场内会产生一系列衍射级次,且各级次衍射光强与外界加速度之间呈函数关系。完成了微米光栅加速度计敏感头的加工,搭建了实验测试平台,完成了加速度计的灵敏度以及静电驱动性能测试。为未来新型集成式微米光栅加速度计设计和加工提供参考。

关键词：加速度传感器微米光栅光学干涉静电驱动