Collaborative Research: Oceanic Applications of Laser Induced Breakdown Spectroscopy: Laboratory Validation

项目概述P.I.Care，Alan(WHOI)提案#：0527927P.I.Angel，Stanley(南卡罗来纳州)提案#：0527910PROJECT标题：激光诱导击穿光谱的海洋应用：实验室验证项目摘要拟议工作的目标是在实验室调查、表征和量化LIBS系统，用于典型的高压海洋的散装水溶液，重点放在未来在大洋中脊的热液喷口系统的应用上。拟议工作的主要成果将是重要的仪器参数、现场校准标准以及关于高压下LIBS等离子体的基本新信息。这项工作将对LIBS系统在海洋原位应用的未来发展至关重要。正如最近海洋科学讲习班的报告所确认的那样，开发就地化学和生物传感器是海洋科学的一个高度优先事项。特别是，不需要样品制备的实时、非侵入性、多元素化学传感能力将是对当前海洋学技术的重大进步。拟议的工作将支持实施这种传感器所需的基本实验室调查。在过去的二十年里，一种名为激光诱导击穿光谱(LIBS)的新光谱技术得到了发展，并在恶劣环境下的现场测量中迅速获得了青睐。LIBS技术利用聚焦在样品上的高功率激光来产生等离子体或“激光火花”。使用覆盖部分或全部近红外紫外线的选通光谱仪来捕获等离子体光谱。等离子体既辐射衰减相对较快的连续介质分量，又辐射衰减较慢的发射线分量。从等离子体消融获得的谱线波长和强度可以与标准原子线参考相比较，和/或对照已知组成的样品进行校准，以确定样品的化学成分。这种相对简单的仪器对固体、液体、气体和气溶胶中几乎所有百万分之一或更好范围内的元素都能产生同时的灵敏度。由于采样区域非常小，该方法是有效的非侵入性的，并且不需要样品制备。它也很快，本质上是一种实时测量。

Project SummaryP.I. Chave, Alan (WHOI) Proposal #: 0527927P.I. Angel, Stanley (South Carolina) Proposal #: 0527910PROJECT TITLE: Oceanic Applications of Laser Induced Breakdown Spectroscopy: Laboratory ValidationProject SummaryThe goal of the proposed work is to investigate, characterize, and quantify a LIBS system in the laboratory for bulk aqueous solutions typical of the oceans at high pressure with some emphasis being placed on future applications at hydrothermal vent systems at mid-ocean ridges. The major products of the proposed work will be important instrumental parameters, in situ calibration standards, and fundamental, new information about LIBS plasmas at high pressure. This work will be critical to the future development of LIBS systems for in situ oceanic applications. The development of in situ chemical and biological sensors is a high priority in the ocean sciences, as is recognized in the reports from recent ocean sciences workshops. In particular, a realtime, non-invasive, multi-element chemical sensing capability which does not require sample preparation would be a significant advance over current oceanographic technology. The proposed work will support essential laboratory investigations required to implement such a sensor. Over the past two decades, a new spectroscopic technique called laser induced breakdown spectroscopy (LIBS) has been developed and is rapidly gaining favor for in situ field measurements in hostile environments. The LIBS technique utilizes a high power laser focused on a sample to create a plasma or "laser spark". A gated spectrometer covering part or all of the ultraviolet through near infrared range is used to capture the plasma spectrum. The plasma radiates both a continuum component which decays relatively rapidly and an emission line component which decays more slowly. The spectral line wavelengths and intensities obtained from plasma ablation can be compared with a standard atomic line reference and/or calibrated against samples of known makeup to determine the chemical composition of the sample. This relatively simple apparatus yields simultaneous sensitivity to virtually all elements in the parts-per-million or better range in solids, liquids, gases and aerosols. The approach is effectively non-invasive due to very small sampling regions and requires no sample preparation. It is also fast and is essentially a real-time measurement.