固体基底辅助增强水下原位LIBS探测技术研究及试验验证  

Research and Experimental Validation of Solid Substrate-Assisted Enhanced Underwater In-Situ LIBS Detection Technology

作　　者：郭金家[1] 秦云鹏[1] 隋明达 张泽迎 韩建文 卢渊[1] 程凯[1] 田野[1] 叶旺全 Guo Jinjia;Qin Yunpeng;Sui Mingda;Zhang Zeying;Han Jianwen;Lu Yuan;Cheng Kai;Tian Ye;Ye Wangquan(Faculty of Information Science and Engineering,Ocean University of China,Qingdao 266100,Shandong,China)

机构地区：[1]中国海洋大学信息科学与工程学部,山东青岛266100

出　　处：《光学学报》2024年第24期72-77,共6页Acta Optica Sinica

基　　金：国家重点研发计划项目(2023YFC2811700,2021YFB3203004);国家自然科学基金(62205170,62205320);崂山实验室“十四五”重大项目课题(LSKJ202203603)。

摘　　要：激光诱导击穿光谱(LIBS)技术在水下原位探测过程中受水体影响,特别是在深海环境受到水体压力影响,存在连续背景强、特征谱线展宽严重、信号较弱的问题,亟需简单方便且能够适应于水下原位的增强方法。针对此需求,对基于固体基底辅助增强方法在实际应用的可行性进行了试验验证。本工作研制了一套固体基底辅助增强模块,并将该模块与水下LIBS系统相结合,先后开展了实验室、浅海和深海测试。实验对不同基底的增强效果进行了比较,选择硅基底作为增强材料,并进一步对连续工作条件下的增强效果进行了验证。浅海和深海测试都证明了该方法在水下原位测量中的有效性,在浅海条件下,硅基底辅助原位探测可以获得6倍以上的增强效果,单个基底靶的增强效果能持续30 min以上。1503 m深海条件下,铁基底辅助原位探测可以获得5倍的增强效果。海试试验,特别是深海试验的成功,为深海LIBS水体探测原位增强提供了一种方便、高效的方法。Objective Laserinduced breakdown spectroscopy(LIBS)has such as no sample pretreatment,simultaneous multielement detection,and rapid analysis.It is currently the only technique capable of direct insitu detection of solid metal elements underwater.Although LIBS has been successfully applied underwater,it encounters challenges like weak characteristic radiation,severe spectral line broadening,and short signal lifetime due to the properties of water.Therefore,it is necessary to develop enhancement methods tailored for insitu underwater LIBS detection.Previous studies have confirmed in the laboratory that solid substrateassisted LIBS can effectively enhance spectral intensity.Based on this,we verify the feasibility of this enhancement method for underwater insitu applications using a selfdeveloped deepsea LIBS system,tested in both shallow-and deepsea environments.Methods Using the LIBSeaⅡsystem developed by Ocean University of China(OUC),we incorporate a solid substrateassisted enhancement module.The system structure is shown in Figure 1.The module consists of an underwater stepper motor and a solid substrate target.The solid substrate target is placed on a substrate carrier device designed as a quartercircle for ease of operation by robotic systems.Six solid targets are positioned equidistantly on the carrier device and secured with adhesive.In practice,the underwater stepper motor drives the substrate carrier in a reciprocating motion,rotating 90°each time,with the laser sequentially acting on the diagonal of the six square substrates.We test the system in a laboratory pool,in the shallow waters off Jiaozhou Bay,Qingdao,and in the South China Sea at a depth of 1503 m to validate the method.Results and Discussions In the laboratory validation,comparing the enhancement effects of silicon,zinc,copper and nickel substrates,silicon demonstrates the best performance and is thus used as the substrate material in subsequent tests.Six identical silicon substrates are fixed in the substrate carrier,and rotation is control

关 键 词：海洋光学 激光诱导击穿光谱技术 基底辅助增强 水下原位 深海海试 

分 类 号：O436[机械工程—光学工程]