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Wearable ultrasensitive and rapid human physiological monitoring based on microfiber Sagnac interferometer

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Science China(Information Sciences) 2024年第3期67卷 281-290页

作者： Xin WANG Hongyou ZHOU Meihua CHEN Yongcheng HE Zhishen ZHANG Jiulin GAN zhongmin yang State Key Laboratory Luminescent Materials and Devices Institute of Optical Communication MaterialsSpecial Glass Fiber and Device Engineering Technology Research and Development Center of Guangdong ProvinceGuangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of Technology Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology Foshan University

High-sensitive and fast-responding flexible strain sensors are essential for the smart wearable devices that precisely and dynamically perceive the weak deformations induced by human physiological signals. Here, a flexible strain sensor via polydimethylsiloxane(PDMS)-encapsulated microfiber Sagnac interferometer was designed and prepared for monitoring the human pulse signals and sound vibrations. The sensor achieved a record-breaking sensitivity(gauge factor, GF = 9977) and an extremely low detection limit(0.00025%) due to the strong polarization-dependent coupling effect in the microfiber coupler and the polarization-mixing effect in the Sagnac loop. The relative intensity demodulation method also enabled a fast response time of 10 μs. The wearable pulse measurements were implemented by attaching this flexible strain sensor directly to human skin at various locations and the waveform details were accurately captured. Taking advantage of the ultra-high sensitivity and fast response performance of the prepared sensor, the real-time dynamic acquisition of the underwater weak signal, such as the hydro-acoustic waves with a wide range of 20 Hz–16.86 k Hz, has been demonstrated. These initial results pave the way for a new and innovative category of underwater wearable devices with rapid detection of human physiological signals and weak environmental vibrations.

关键词： flexible strain sensor microfiber Sagnac interferometer underwater detection

Transparent nanocrystal-in-glass composite fibers for multifunctional temperature and pressure sensing

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Fundamental Research 2024年第3期4卷 624-634页

作者： Qinpeng Chen Qiwen Pan Shiliang Kang Zhenlu Cai Shengda Ye Puxian Xiong zhongmin yang Jianrong Qiu Guoping Donga State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSchool of Materials Science and EngineeringSchool of Physics and OptoelectronicsSouth China University of TechnologyWushan Road 381Tianhe DistrictGuangzhou 510640China Laboratory of Infrared Materials and Devices the Research Institute of Advanced TechnologiesNingbo UniversityFenghua Road 818NingboJiangbei 315211China College of Optical Science and Engineering State Key Laboratory of Modern Optical InstrumentationZhejiang UniversityHangzhou 310027China

The pursuit of compact and integrated devices has stimulated a growing demand for multifunctional sensors with rapid and accurate responses to various physical parameters,either separately or *** fiber sensors have the advantages of robust stability,light weight,and compact geometry,enabling real-time and noninvasive signal detection by monitoring the fluorescence *** substantial progress in fluorescence sensors,achieving multifunctional sensing in a single optical fiber remains *** solve this problem,in this study,we present a bottom-up strategy to design and fabricate thermally drawn multifunctional fiber sensors by incorporating functional nanocrystals with temperature and pressure fluorescence responses into a transparent glass *** generate the desired nanocrystal-in-glass composite(NGC)fiber,the fluorescent activators,incorporated nanocrystals,glassy core materials,and cladding matrix are rationally *** the fluorescence intensity ratio technique,a self-calibrated fiber sensor is demonstrated,with a bi-functional response to temperature and *** temperature sensing,the NGC fiber exhibits temperature-dependent near-infrared emission at temperatures up to 573 K with a maximum absolute sensitivity of 0.019 K−1.A pressure-dependent upconversion emission is also realized in the visible spectral region,with a linear slope *** successful demonstration of multifunctional NGC fiber sensors provides an efficient pathway for new paradigms of multifunctional sensors as well as a versatile strategy for future hybrid fibers with novel combinations of magnetic,optical,and mechanical properties.

关键词： Fiber Nanocrystal-in-glass composite Nanocrystals Fluorescence detection Temperature-pressuresensing

窄谱被动锁模光纤激光中心波长高速调谐及其脉冲重建过程

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光学学报 2024年第5期44卷 120-127页

作者：朱喆王麓屹陈学文林巍杨洋张静刘涛韦小明杨中民华南理工大学物理与光电学院广东广州510640 华南理工大学发光材料与器件国家重点实验室广东广州510640 浙江机电职业技术学院国际教育学院浙江杭州310051 华南理工大学广东省特种光纤材料与器件工程技术研究开发中心广东广州510640 华南理工大学广东省光纤激光材料及应用技术重点实验室广东广州510640 华南师范大学未来技术研究院广东广州510006

报道基于快速声光滤波技术的窄谱被动锁模掺镱光纤激光中心波长快速调谐研究。窄谱锁模光纤激光器系统的输出功率可达200 mW,脉冲宽度为5.87 ps,重复频率为40.874 MHz,光谱带宽为0.15 nm。通过编程声光可调谐滤波器的射频信号,可以获得... 详细信息

报道基于快速声光滤波技术的窄谱被动锁模掺镱光纤激光中心波长快速调谐研究。窄谱锁模光纤激光器系统的输出功率可达200 mW,脉冲宽度为5.87 ps,重复频率为40.874 MHz,光谱带宽为0.15 nm。通过编程声光可调谐滤波器的射频信号,可以获得中心波长在1016~1042 nm范围内可调谐的稳定锁模脉冲。为了掌握腔内滤波时激光脉冲的重建过程,利用色散傅里叶变换技术观测波长调谐时激光脉冲的实时重建过程,并确定激光器的最高中心波长调谐频率约为5 kHz。

关键词：激光器光纤激光器波长可调谐色散傅里叶变换脉冲重建

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防渗漏施工技术在房屋建筑工程中的应用

中国厨卫 2024年第7期23卷 142-144页

作者：杨中民青岛建设监理研究有限公司山东青岛266000

在现代社会中,建筑物的安全性和耐久性已经成为人们关注的重要问题。为了解决这些问题,施工单位需要采取有效的措施来确保建筑物的质量和性能。因此,房屋建筑工程中防渗漏施工技术的应用变得尤为重要。文章从房屋建筑工程防渗漏技术的... 详细信息

在现代社会中,建筑物的安全性和耐久性已经成为人们关注的重要问题。为了解决这些问题,施工单位需要采取有效的措施来确保建筑物的质量和性能。因此,房屋建筑工程中防渗漏施工技术的应用变得尤为重要。文章从房屋建筑工程防渗漏技术的概述出发,并结合实际案例,对防渗漏技术的应用进行分析,以期为房屋建筑工程提供更好的保障。

关键词：房屋建筑防渗漏施工技术渗漏

回火工艺对BJ890钢组织和力学性能的影响

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钢铁研究学报 2024年第1期36卷 95-107页

作者：杨睿杨忠民刘静于勇李昭东陈颖武汉科技大学省部共建耐火材料与冶金国家重点实验室湖北武汉430081 钢铁研究总院有限公司工程用钢研究院北京100081 黑龙江建龙钢铁有限公司黑龙江双鸭山155126

以BJ890臂架用无缝钢管为实验对象,利用光学显微镜、扫描电子显微镜,电子背散射衍射、透射电子显微镜、万能试验机以及冲击试验机等测试手段,研究了不同调质工艺对钢的微观组织与力学性能的影响规律。结果表明:随回火温度升高,钢中马氏... 详细信息

以BJ890臂架用无缝钢管为实验对象,利用光学显微镜、扫描电子显微镜,电子背散射衍射、透射电子显微镜、万能试验机以及冲击试验机等测试手段,研究了不同调质工艺对钢的微观组织与力学性能的影响规律。结果表明:随回火温度升高,钢中马氏体组织分解,碳化物析出,强度降低,韧性升高。BJ890钢的最佳调质工艺为920℃淬火+620℃回火。在620℃回火温度下,60min内晶粒尺寸基本不变;120min回火时,晶粒显著增大。随回火时间延长,碳化物析出长大,从“短棒状”逐渐转变为“球形”。同时钢强度降低,冲击韧性升高,但回火60min以上冲击韧性变化不明显。最佳热处理工艺为920℃+14min淬火,620℃+60min回火。钢材抗拉强度为1025MPa,屈服强度为983MPa,伸长率为19.56%,-20℃冲击功为110J,-40℃冲击功为69J,ETT韧脆转变温度为-30.1℃,AFTT韧脆转变温度为-43.4℃。

关键词： BJ890钢回火工艺渗碳体冲击韧性韧脆转变温度

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我国关键有源光纤材料发展战略研究

中国工程科学 2024年第3期26卷 42-52页

作者：宋向阳唐国武董国平杨中民华南理工大学物理与光电学院广州510640 华南理工大学发光材料与器件国家重点实验室广州510640 广东省光纤激光材料与应用技术重点实验室广州510640 广东工业大学物理与光电工程学院广州510006

光纤激光器及放大器广泛应用于智能制造、生命健康、新一代信息技术以及国防军事等领域,而有源光纤是光纤激光器和放大器的关键材料。本文综述了红外波段(近红外1.0μm、近中红外1.3~1.5μm、中红外2.0~3.0μm)关键有源光纤材料的研究进... 详细信息

光纤激光器及放大器广泛应用于智能制造、生命健康、新一代信息技术以及国防军事等领域,而有源光纤是光纤激光器和放大器的关键材料。本文综述了红外波段(近红外1.0μm、近中红外1.3~1.5μm、中红外2.0~3.0μm)关键有源光纤材料的研究进展,从增益系数、增益带宽、特种光纤应用等角度分析了国内外有源光纤材料的发展现状和趋势,指出了我国在该领域所面临的生产设备国产化率不高、高端工业化产品不足等问题,提出了我国关键有源光纤材料未来的重点发展思路、发展方向和发展目标。最后从基本理论自主创新、产业可持续发展、推动政策体系构建、高技术产品引领、全产业链循环发展、领域人才梯队培养等方面提出了对策建议,以期推动我国关键有源光纤材料领域优质、快速发展。

关键词：有源光纤材料红外波段光纤增益光纤带宽

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光波导阵列中拓扑态及其应用的研究进展

科学通报 2024年第15期69卷 2031-2041页

作者：卫睿珊康娟张庆龙邱建荣杨中民董国平华南理工大学材料科学与工程学院发光材料与器件国家重点实验室广州510641 郑州大学物理学院郑州450001 浙江大学光电科学与工程学院杭州310027 华南理工大学物理与光电学院广州510641

近年来,在拓扑绝缘体理论体系的支撑下,拓扑光子学因具有独特的光场调控能力而引起了广泛关注,并发展出具有拓扑特性的拓扑光子器件.基于不同光学平台的拓扑光子器件具有高集成度、抗扰动、抗无序影响等优点,在光传感、光通信、光量子... 详细信息

近年来,在拓扑绝缘体理论体系的支撑下,拓扑光子学因具有独特的光场调控能力而引起了广泛关注,并发展出具有拓扑特性的拓扑光子器件.基于不同光学平台的拓扑光子器件具有高集成度、抗扰动、抗无序影响等优点,在光传感、光通信、光量子计算方面有广泛的应用前景.其中光波导阵列由于制备简单、结构精细,且结构的拓扑特性能通过光动力学可视化,是研究拓扑光子学的理想平台之一.本文主要以拓扑光子学理论为基础,对光波导阵列中不同维度的拓扑光子学模型及其实验进展进行回顾与总结,并对拓扑光波导阵列器件制备的难点、发展趋势等进行展望.

关键词：拓扑光子绝缘体光波导阵列拓扑光子效应拓扑光子器件

Genomics Approaches to Domestication Studies of Horticultural Crops

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Horticultural Plant Journal 2019年第6期5卷 240-246页

作者： zhongmin yang Guixiang Li Denise Tieman Guangtao Zhu Key Lab for Potato Biology in Universities of Yunnan The CAAS-YNNU Joint Academy of Potato SciencesYunnan Normal UniversityKunming 650500China Horticultural Sciences Department Plant Innovation CenterUniversity of FloridaGainesvilleFlorida 32611USA

The majority of crops we eat today are derived from the domestication of their wild progenitors. Crop domestication satisfies the human need for food and nutrition. Characterization of the history and genetic basis of crop domestication is essential for us to conduct modern breeding practices. Genomics provide unprecedented opportunities for us to study domestication. In this review, the typical domestication syndromes of horticultural crops will be introduced. Using the tomato as a typical example, we will discuss how genetic and genomic data were used to decipher the origins, progenitors, and domestication processes of this crop. In the domestication exploration of the genetic basis especially,genome-scaled diversity scanning approaches have gained great popularity. Combining these approaches with QTL(Quantitative trait locus)-mapping, GWAS(Genome wide association study), metabolomics and homology-based searches as well as pan-genomics have demonstrated tremendous advantages and significantly contribute to our understanding of domestication. Genomics studies will accelerate domestication research and further breeding of crops.

关键词： domestication syndrome crop origin genomic scanning domestication genes genetic analysis

Stable ultraviolet ultrafast laser based on all-polarizationmaintaining fiber femtosecond laser

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Chinese Optics Letters 2024年第3期22卷 76-82页

作者：田昊朱喆林巍李子豪温俊鹏修昊范怡衡韦池一韦小明杨中民 School of Physics and Optoelectronics/State Key Laboratory of Luminescent Materials and Devices Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesGuangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of TechnologyGuangzhou 510640China Research Institute of Future Technology South China Normal UniversityGuangzhou 510006China

We report a high-stability ultrafast ultraviolet(UV)laser source at 352 nm by exploring an all-fiber,all-polarizationmaintaining(all-PM),Yb-doped femtosecond fiber laser at 1060 *** output power,pulse width,and optical spectrum width of the fiber laser are 6 W,244 fs,and 17.5 nm,*** UV ultrashort pulses at a repetition rate of 28.9 MHz are generated by leveraging single-pass second-harmonic generation in a 1.3-mm-long BiB_(3)O_(6)(BIBO)and sum frequency generation in a 5.1-mm-long *** maximum UV output power is 596 *** root mean square error of the output power of UV pulses is 0.54%.This laser,with promising stability,is expected to be a nice source for frontier applications in the UV wavelength window.

关键词： all-polarization-maintaining fiber ultrafast fiber laser UV laser