Application of in-situ digital holography in the study of particles, organisms and bubbles within their natural environment
Application of in-situ digital holography in the study of particles, organisms and bubbles within their natural environment
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原位数字全息术在自然环境中颗粒、生物和气泡研究中的应用
DOI：
10.1117/12.920570
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发表时间：
2012
期刊：
影响因子：
3.2
通讯作者：
Cao Zhang
中科院分区：
文献类型：
--
作者：
S. Talapatra;J. Sullivan;J. Katz;M. Twardowski;H. Czerski;P. Donaghay;Jiarong Hong;J. Rines;M. McFarland;A. R. Nayak;Cao Zhang
由于缺乏充分的技术来充分表征关键参数和相互作用，特别是对于短暂的气泡和聚集体，因此对自然沃茨中悬浮颗粒场、颗粒动力学和整体光学性质之间的联系知之甚少。本文重点介绍了数字全息术的能力，提供非侵入性的，高分辨率的3-D成像的颗粒和气泡在其自然环境。作为原位数字全息显微镜（DHM）商业化的NOPP项目（HOLOCAM）的一部分，在华盛顿州东桑德收集了原型原位DHM（“Holosub”）的现场数据。Holosub是一种基于同轴全息术的潜水平台，以两种配置部署：用于垂直剖面的自由漂移模式和拖曳模式。在自由漂移模式下，垂直剖面的剪切应变和耗散率，未受干扰的大小和空间分布的颗粒和生物体，和硅藻链的取向记录使用全息图像。同时收集了水文和光学数据，以及用于确定浮游植物种类的离散水样。在拖曳模式下，记录表面下方气泡的尺寸和空间分布，以表征另一艘船产生的尾流的消散，并与同时记录的光学和声学散射数据进行比较。开发了从全息数据中提取气泡尺寸分布和浓度的工具。初步数据分析表明，所有三种仪器在相同位置检测到高浓度的气泡，而气泡尺寸分布的比较表明趋势有一些相似之处，也有显著差异。
The link between suspended particle fields, particle dynamics and bulk optical properties in natural waters is poorly known because adequate technology is lacking to fully characterize critical parameters and interactions, especially for ephemeral bubbles and aggregates. This paper highlights the capabilities of digital holography to provide non-intrusive, high-resolution 3-D imaging of particles and bubbles in their natural environment. As part of a NOPP project (HOLOCAM) to commercialize an in-situ digital holographic microscope (DHM), field data with a prototype in-situ DHM (the "Holosub") were collected in East Sound, WA. The Holosub, an in-line holography based submersible platform, was deployed in two configurations: free-drifting mode for vertical profiling, and towed mode. In free-drifting mode, vertical profiles of shear strain and dissipation rates, undisturbed size and spatial distributions of particles and organisms, and the orientation of diatom chains were recorded using the holographic images. Hydrographic and optical data, as well as discrete water samples to identify phytoplankton species were concurrently collected. In towed mode, the size and spatial distributions of bubbles just below the surface were recorded to characterize the dissipation of a wake generated by another ship, and compared to optical and acoustic scattering data recorded simultaneously. Tools to extract the size distribution and concentration of bubbles from the holographic data were developed. A preliminary data analysis indicated high concentrations of bubbles detected by all three instruments at the same locations, while comparison of the bubble size distributions indicated some similarities in trends, as well as significant differences.
DOI：
10.1121/1.3569723
发表时间：
2011-11
期刊：
The Journal of the Acoustical Society of America
影响因子：
--
作者：
H. Czerski;S. Vagle;D. Farmer;N. Hall-Patch
通讯作者：
H. Czerski;S. Vagle;D. Farmer;N. Hall-Patch
影响因子：
3.8
作者：
Fuentes, E.;Coe, H.;McFiggans, G.
通讯作者：
McFiggans, G.