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Study of pressure effects on ocean in-situ detection using laser-induced breakdown spectroscopy

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Plasma Science and Technology 2019年第3期21卷 182-187页

作者： Jinjia GUO Nan LI Jiaojian SONG ronger zheng Optics and Optoelectronics Laboratory Ocean University of China

Laser-induced breakdown spectroscopy(LIBS) has attracted extensive attention as a new technique for in-situ marine application. In this work, the influence of deep-sea high pressure environment on LIBS signals was investigated by using a compact LIBS-sea system developed by Ocean University of China for the in-situ chemical analysis of seawater. The results from the field measurements show that the liquid pressure has a significant effect on the LIBS signals. Higher peak intensity and larger line broadening were obtained as the pressure increases. By comparing the variations of the temperature and salinity with the LIBS signals, a weak correlation between them can be observed. Under high pressure conditions, the optimal laser energy was higher than that in air environment. When the laser energy exceeded 17 mJ, the effect of laser energy on the signal intensity weakened. The signal intensity decreases gradually at larger delays. The obtained results verified the feasibility of the LIBS technique for the deep-sea in-situ detection, and we hope this technology can contribute to surveying more deep-sea environments such as the hydrothermal vent regions.

关键词： laser-induced breakdown spectroscopy deep-sea in-situ detection pressure effect plasma emission

Preliminary investigation into feasibility of dissolved methane measurement using cavity ringdown spectroscopy technique

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Frontiers of physics 2016年第6期11卷 159-166页

作者： Zhen-Nan Wang Wang-Quan Ye Xiao-Ning Luan Fu-Jun Qi Kai Cheng ronger zheng Optics and Optoelectronies Laboratory Ocean University of China Qingdao 266100 China

For the exploration of gas hydrate resources by measuring the dissolved methane concentration in seawater, a continuous-wave cavity ringdown spectroscopy (CW-CRDS) experimental setup was constructed for trace methane detection. A current-modulation method, rather than a cavity-modulation method using an optical switch and a piezoelectric transducer, was employed to realize the cavity excitation and shutoff. Such a current-modulation method enabled the improvement of the experimental setup construction and stability, and the system size and stability are critical for a sensor to be deployed underwater. Ringdown data acquisition and processing were performed, followed by an evaluation of the experimental setup stability and sensitivity. The obtained results demonstrate that great errors are introduced when a large fitting window is selected if the analog-to-digital converter has an insufficient resolution. The ringdown spectrum of methane corresponding to the 2 nu(3) band R(4) branch was captured, and the methane concentration in lab air was determined to be 2.06 ppm. Further experiments for evaluating the quantitative ability of this CW-CRDS experimental setup are underway from which a high-sensitivity methane sensor that can be combined with a degassing system is expected.

关键词： gas hydrate methane continuous-wave cavity ringdown spectroscopy current-modulation method

Spectral characteristics of underwater laser-induced breakdown spectroscopy under high-pressure conditions

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Plasma Science and Technology 2020年第7期22卷 28-35页

作者： Lintao WANG Ye TIAN Ying LI Yuan LU Jinjia GUO Wangquan YE ronger zheng Optics and Optoelectronics Laboratory Ocean University of ChinaQingdao 266100People's Republic of China

Laser-induced breakdown spectroscopy(LIBS) has been proven to be an attractive technique for in situ oceanic ***,when applying LIBS into deep-sea,the pressure effect caused by different ocean depths is inescapable and could have great influence on the LIBS *** this work,spectral characteristics of underwater LIBS were investigated as a function of pressure in the range of 0.1-45 MPa.A high-pressure chamber built in the laboratory was used to simulate the high-pressure deep-sea *** laser energy and detection delay were first determined under different pressure conditions and were shown to be independent of the external *** increase in pressure has a significant impact both on the peak intensity and line broadening of the observed *** peak intensity of Na,Li and K lines increases with the increasing pressure until a maximum intensity is reached at 12.5 *** this value,the peak intensity decreases gradually up to 45 *** Ca line,the maximum intensity was observed at 30 *** line broadening keeps constant at low pressures from 0.1-10 MPa,while it increases linearly at higher pressures,indicating a higher electron density caused by the compression effect of the high external *** also compared the spectral data obtained from the high-pressure chamber and from the field sea trials,and the good consistency between the laboratory data and sea-trial data suggested the key role of pressure effect on underwater LIBS signals for practical deep-sea applications.

关键词： underwater laser-induced breakdown spectroscopy spectral characteristics high-pressure chamber pressure effect deep-sea application

A new stage of the Asian laser-induced breakdown spectroscopy community

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Plasma Science and Technology 2022年第8期24卷 1-4页

作者： Weilun GU Lei ZHANG Meirong DONG Cong LI Ye TIAN Zongyu HOU Zhe WANG ronger zheng State Key Laboratory of Power Systems International Joint Laboratory on Low Carbon Clean Energy InnovationDepartment of Energy and Power EngineeringTsinghua UniversityBeijing 100084People’s Republic of China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006People’s Republic of China School of Electric Power South China University of TechnologyGuangzhou 510640People’s Republic of China Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024People’s Republic of China College of Physics and Optoelectronic Engineering Ocean University of ChinaQingdao 266100People’s Republic of China

Laser-induced breakdown spectroscopy (LIBS) is an atomic emission spectroscopy technique gaining much attention since it was created in 1962[1].In 2021,the 4th Asian Symposium on LIBS (ASLIBS) and the ten-year anniversary of Chinese Symposium on LIBS (CSLIBS) were jointly held in Qingdao,symbolizing the development of the Asian and Chinese LIBS communities into a new *** the initiation of CSLIBS in Qingdao (2011) and ASLIBS in Wuhan[2](2015).

关键词： breakdown laser spectroscopy

Study on compensating methods of transmission system at 40 Gb/s in photonic crystal fiber

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Chinese Optics Letters 2010年第5期8卷 471-473页

作者：王晶苗洪利宋诗艳郑荣儿 College of Information Science and Engineering Ocean University of China

Two compensating methods about solitons transmition systems at 40 Gb/s in a photonic crystal fiber are *** maximum transmission distance of the system is calculated numerically by sliding filters and synchronic modulation *** maximum transmission distance increases evidently which occasionally is three times longer than *** results show that the actions of high order dispersion,polarization mode dispersion,and high order nonlinearity are weakened by the two methods. The compensating effect of synchronic modulation technology is better than that of the other *** capability of the compensated system is ameliorated,which is shown by eye patterns.

关键词： Crystal whiskers Dispersions Modulation Photonic crystal fibers

Spectra-assisted laser focusing in quantitative analysis of laser-induced breakdown spectroscopy for copper alloys

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Plasma Science and Technology 2023年第4期25卷 204-209页

作者：李守杰郑荣儿出口祥啓叶旺全田野郭金家李颖卢渊 College of Physics and Optoelectronic Engineering Ocean University of ChinaQingdao 266100People’s Republic of China Graduate School of Advanced Technology and Science Tokushima UniversityTokushima 770-8501Japan

Laser-induced breakdown spectroscopy(LIBS)is a capable technique for elementary analysis,while LIBS quantitation is still under *** quantitation,precise laser focusing plays an important role because it ensures the distance between the laser and *** the present work,we employed spectral intensity as a direct way to assist laser focusing in LIBS quantitation for copper *** is found that both the air emission and the copper line could be used to determine the position of the sample surface by referencing the intensity ***,the fine quantitation was only realized at the position where the air emission(e.g.O(I)777.4 nm)reached intensity maximum,and also in this way,a repeatable quantitation was successfully achieved even after 120 *** results suggested that the LIBS quantitation was highly dependent on the focusing position of the laser,and spectra-assisted focusing could be a simple way to find the identical condition for different samples’*** the future,this method might be applicable in field measurements for LIBS analysis of solids.

关键词： LIBS laser focusing spectra assistance quantitative analysis copper alloys

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固体染料激光器的研究进展

激光与光电子学进展 2006年第1期43卷 7-10页

作者：戴琳郑荣儿中国海洋大学光学光电子实验室青岛266071

综述固体染料激光器的发展及研究最新成果。系统地阐述了同体染料激光器的基质、抽运光源、染料光稳定性和新型激光染料合成等方面。

关键词：固体染料激光器活性介质光稳定性基质

基于静止轨道水色卫星数据的渤海总吸收系数遥感反演和逐时变化研究

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光学学报 2016年第4期36卷 21-29页

作者：牟冰崔廷伟秦平刘荣杰郑荣儿中国海洋大学信息科学与工程学院山东青岛266100 国家海洋局第一海洋研究所山东青岛266061

渤海是我国的半封闭内海,受陆源影响显著,水体光学性质复杂多变,静止轨道水色卫星(GOCI)的高时间分辨率数据为研究渤海水体总吸收系数的时空变化特征,特别是逐时变化提供了可能。针对GOCI波段设置,利用实测数据建立了基于遥感反射率波... 详细信息

渤海是我国的半封闭内海,受陆源影响显著,水体光学性质复杂多变,静止轨道水色卫星(GOCI)的高时间分辨率数据为研究渤海水体总吸收系数的时空变化特征,特别是逐时变化提供了可能。针对GOCI波段设置,利用实测数据建立了基于遥感反射率波段比值的412、443、555 nm波段渤海总吸收系数遥感反演模型,经独立实测数据检验,模型反演值与实测值的相关系数大于0.8,平均相对误差(APD)小于13%,中值相对误差小于9%,优于已有典型算法(精度提高约10%);经独立现场-卫星时空匹配数据检验,基于该模型和GOCI卫星数据的总吸收系数遥感反演平均相对误差在35%以内。基于2015年5月4日1天8景的GOCI影像和所建立的模型,研究了渤海总吸收系数的逐时变化特征。结果表明,8:30—15:30期间总吸收系数变幅主要分布范围是0.2~0.3 m^(-1),最大变幅可达到0.8 m^(-1),变幅极大值主要分布在辽东湾、渤海湾和莱州湾近岸海域。结合潮汐数据的分析发现,辽东湾、渤海湾北部总吸收系数与潮高的逐时变化具有较好的一致性,总吸收系数极小值出现时刻滞后于低潮时刻0~1.5 h;莱州湾西部总吸收系数与潮高逐时变化呈明显负相关性;渤海湾南部、莱州湾东部总吸收系数与潮高变化未见显著相关性。

关键词：海洋光学总吸收系数遥感反演静止轨道水色卫星

海底观测网的OUC-Raman节点现场机控制系统

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哈尔滨工程大学学报 2017年第8期38卷 1216-1222页

作者：刘晓瑞亓夫军叶旺全宋智愚郑荣儿中国海洋大学光学光电子实验室山东青岛266100

为满足海底观测网络对仪器节点的技术要求,本文设计实现了一套面向OUC-Raman仪器节点水下现场机的控制系统。该系统由电源管理模块和控制器模块组成,利用观测网提供的电力和通信链路控制现场机内部的光谱探测系统和其他外部设备,以实现... 详细信息

为满足海底观测网络对仪器节点的技术要求,本文设计实现了一套面向OUC-Raman仪器节点水下现场机的控制系统。该系统由电源管理模块和控制器模块组成,利用观测网提供的电力和通信链路控制现场机内部的光谱探测系统和其他外部设备,以实现对海底化学环境的长期观测。电源管理模块能够确保现场机的电气特性满足观测网的要求,控制器模块实现对现场机光谱探测系统和外部设备的有效控制。该控制系统配置了以PC104工控机和MSP430微控制器为核心的控制体系,允许岸基终端在线访问现场机并实现对其工作模式的控制。该系统的相关功能在实验室模拟调试和观测网接驳联调过程中得到了检验,结果表明该系统达到了接驳入网的标准,可望在海底观测网上得到应用。

关键词：海底观测网 OUC-Raman仪器节点电源管理控制器模块系统冗余网络通信电气保护