RamaCam - In situ holographic imaging and chemical spectroscopy for long term scalable analysis of marine particles in deep-sea environments

RamaCam - 原位全息成像和化学光谱，用于深海环境中海洋颗粒的长期可扩展分析

• 批准号: NE/R012288/1
• 负责人: Thangavel Thevar
• 金额: $ 10.35万
• 依托单位: University of Aberdeen
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FR012288%2F1
• 关键词: RamaCam; situ; holographic; imaging; chemical

While modern day ocean sensors are capable of measuring the concentration of chemicals dissolved in seawater to such high sensitivities that we rarely need to sample them, many chemicals form tiny particles in seawater, often with diameters smaller than the width of a human hair, and these act as a blind spot for most of today's sensors. The only way to study these particles in detail, is to recover samples and analyse them in a laboratory. Marine particles include plankton, dead skin shed from whales and fish, faecal pellets as well as micro-plastics and other types of human litter. If you took a bottle of seawater from the surface of the ocean and compared it to seawater from the deep-sea, the number of large particles would be much higher in the surface water, because light from the sun provides energy that can be used by plankton, which form a large proportion of the particles where sunlight can reach within 200 m of the ocean surface. At the same time, we also know that most particles sink, and so it is important for us to understand why there are so few particles in the deep-sea, how much material is sinking to the seafloor, what it is made out of, how fast it sinks, and what proportion of it makes it back up to the sea surface or gets washed on-shore. The reason this is important, is that particles that sink to the seafloor are thought to play an important role in removing carbon from our atmosphere. At the same time, scientists are worried that litter and plastics may accumulate on the seafloor and damage the fragile seafloor ecosystems that exist at an average depth of more than 3800 m below the ocean's surface.The aim of this project, is to demonstrate new ways in which we can improve our ability to study the distribution of different types of particles in the deep-sea. The sensor that will be developed will analyse large volumes of seawater, almost 2/3 of a drinks can a second, in order to gather data in the deep-sea where the relative number of particles is small. The sensor will count the number of particles that pass through it, study their appearance and also perform laser based chemical analysis to identify what these particles are made out of. An important aspect of this work is to achieve this in a compact, low power way. The last point is important to allow large numbers of this new type of sensor to be used to study vast regions of the ocean for several years at a time. This innovative work will be carried out by researchers based in the UK and in Japan, both island nations with a long history of marine research, who will combine their expertise to overcome the difficult challenges that are involved in achieving our goal. By helping researchers in the future achieve a better understanding how particles in the ocean behave, and this can in turn help our governments decide what kinds of policies need to be put in place to preserve our ocean and our atmosphere.

虽然现代海洋传感器能够测量溶解在海水中的化学物质的浓度，而我们很少需要对它们进行采样的高敏感性，但许多化学物质在海水中形成微小的颗粒，通常比人毛的宽度小于人毛的宽度，而对于当今大多数传感器来说，这些化学物质是盲人的。详细研究这些颗粒的唯一方法是在实验室中恢复样品并分析样品。海洋颗粒包括浮游生物，鲸鱼和鱼的死皮，粪便颗粒以及微型塑料和其他类型的人类垃圾。如果您从海面取一瓶海水并将其与深海的海水进行了比较，那么地表水中的大颗粒数量会更高，因为来自太阳的光提供了浮游生物可以使用的能量，浮游生物可以使用，这些颗粒形成很大比例的颗粒，其中阳光可以在200 m内到达海洋表面200 m。同时，我们还知道大多数颗粒都会下沉，因此，重要的是要了解为什么深海中的颗粒很少，材料沉入了海底多少，它的制成的东西，下沉的速度以及它的比例使它备份到海面上的比例又备份到海面或在岸上洗涤。这很重要的是，沉入海底的颗粒被认为在从我们的大气中去除碳中起着重要作用。同时，科学家担心垃圾和塑料可能会积聚在海底上，并损害脆弱的海底生态系统，而海底生态系统的平均深度超过海洋表面的3800 m以上。该项目的目的是展示我们可以改善深层研究不同类型粒子分布的新方式。将要开发的传感器将分析大量海水，几乎2/3饮料可以一秒钟，以便在颗粒相对数量很小的深海中收集数据。传感器将计算通过它的颗粒数量，研究其外观并进行基于激光的化学分析，以识别这些颗粒由什么制成的。这项工作的一个重要方面是以紧凑的低功率方式实现这一目标。最后一点对于允许大量这种新型传感器一次用于研究海洋地区几年。这项创新的工作将由英国和日本的研究人员进行，这两个岛国都有悠久的海洋研究历史，他们将结合他们的专业知识，以克服实现我们目标所涉及的艰难挑战。通过帮助未来的研究人员可以更好地了解海洋中的颗粒方式，这可以帮助我们的政府确定需要制定哪种政策来保护我们的海洋和气氛。

项目成果

Identification of microplastics in a large water volume by integrated holography and Raman spectroscopy

• DOI: 10.1364/ao.393643
• 发表时间: 2020-06-10
• 期刊: APPLIED OPTICS
• 影响因子: 1.9
• 作者: Takahashi, Tomoko;Liu, Zonghua;Thornton, Blair
• 通讯作者: Thornton, Blair

Digital In-Line Holography for Large-Volume Analysis of Vertical Motion of Microscale Marine Plankton and Other Particles

• DOI: 10.1109/joe.2021.3066788
• 发表时间: 2021-10-01
• 期刊: IEEE JOURNAL OF OCEANIC ENGINEERING
• 影响因子: 4.1
• 作者: Liu, Zonghua;Takahashi, Tomoko;Thornton, Blair
• 通讯作者: Thornton, Blair

Multimodal image and spectral feature learning for efficient analysis of water-suspended particles.

• DOI: 10.1364/oe.470878
• 发表时间: 2023-01
• 期刊: Optics express
• 影响因子: 3.8
• 作者: Tomoko Takahashi;Zonghua Liu;T. Thevar;N. Burns;D. Lindsay;John Watson;Sumeet Mahajan;Satoru Yukioka;Shuhei Tanaka;Yukiko Nagai;B. Thornton