A5050089675- Digital Holography and Microscopy
- Image Processing Techniques and Applications
- Underwater Acoustics Research
- Cell Image Analysis Techniques
- Water Quality Monitoring Technologies
- Advanced Vision and Imaging
- Underwater Vehicles and Communication Systems
- Microplastics and Plastic Pollution
- Microfluidic and Bio-sensing Technologies
- Image Enhancement Techniques
- Ion-surface interactions and analysis
- Recycling and Waste Management Techniques
- Spaceflight effects on biology
- Geophysical and Geoelectrical Methods
- Field-Flow Fractionation Techniques
- Scientific Computing and Data Management
- Heat Transfer and Mathematical Modeling
- Distributed and Parallel Computing Systems
University of Aberdeen
2007-2023
A noncontact method to identify sparsely distributed plastic pellets is proposed by integrating holography and Raman spectroscopy in this study. Polystyrene poly(methyl methacrylate) resin with a size of 3 mm located 20 cm water channel were illuminated using collimated continuous wave laser beam diameter 4 wavelength 785 nm. The same was used take holographic image spectrum pellet the shape, size, composition material. Using compact system, morphological chemical analysis large volume...
This article presents the design, development, and testing of an ultracompact underwater pulsed digital holographic camera (named weeHoloCam) that has been successfully deployed in North Sea. With a footprint 9 cm diameter × 60 long weighing just 3.5 kg, to our knowledge, this is lightest most compact system its kind world. It can be easily adapted for mounting on remotely operated vehicles (ROVs) autonomous (AUVs). weeHoloCam record 12 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Digital holography offers a method of high-resolution imaging microscopic particles and organisms in their natural environment. Automated image extraction data processing are essential for rapid interrogation analysis the vast amounts information contained typical hologram. In this work, we describe robust-automated particle focusing approach, which have developed to extract outlines all within sampling volume each hologram constituting “holovideo.” The output consists ordered point-lists...
We have developed a method to combine morphological and chemical information for the accurate identification of different particle types using optical measurement techniques that require no sample preparation. A combined holographic imaging Raman spectroscopy setup is used gather data from six marine particles suspended in large volume seawater. Unsupervised feature learning performed on images spectral convolutional single-layer autoencoders. The learned features are combined, where we...
Measuring the distribution, characteristics and dynamics of marine microscale plankton other particulate matter is essential to understand vertical flux elements in environment. Digital holographic microscopy a powerful approach for measuring these studying their 3-D trajectories relatively large observation volume. This article demonstrates compact, in-line digital microscope that allows large-volume high-resolution recording particles through combining continuous wave laser short exposure...
A digital holographic camera (eHoloCam) has been developed by us for in situ underwater studies of the distribution and dynamics plankton other marine organisms particles. The eHoloCam uses a frequency-doubled Nd-YAG pulsed laser to freeze-frame rapidly moving particles CMOS imaging sensor high-resolution image capture. Digital holograms are recorded at rates from 5 Hz 25 as videos over period several hours. Data is stored on an embedded computer. capable recording all located water volume...
We present a least-squares solution for the inverse problem in in-line digital holography which is based on point source model. demonstrate that by reformulating reconstruction as an and integrating contour gradient auto-focus search algorithm into routine, more fundamental inversion of hologram can be attained. With this approach calculated without any prior knowledge object's shape/size imposing constraints imaging system. In proof-of-concept study we show our method facilitates accurate...
A submersible pulsed digital holographic camera (named weeHoloCam) has been developed for monitoring microparticles in the ocean, mainly microorganisms. It is most compact and lightweight of its kind. We have built two versions, both same dimensions: 9 cm diameter x 60 long. The first version with aluminium housing (500 m depth rating) weighs 3.5 kg while second titanium (2000 4.7 kg. They can be connected to a 50 subsea cable real-time analysis onboard vessel or battery unit autonomous...
In this paper, we describe an electronic holographic camera that has been developed for in situ underwater studies of the distribution and dynamics plankton other marine organisms particles. Holographic data are stored on embedded computer later extraction analysis. We main optical mechanical specifications outline design, development operation <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">eHoloCam</i> . summarise performance four deployments...
Digital holography is a useful tool to image microscopic particles. Reconstructed holograms give high-resolution shape information that can be used identify the types of However, process reconstructing computationally intensive and cannot easily keep up with rate data acquisition on low-power sensor platforms. In this work, we explore possibility performing object clustering have not been reconstructed, i.e., images raw interference patterns, using latent representations deep-learning...
Suspended particles in the ocean play an important role global nutrient cycles. In this paper, a novel technique for non-contact fast identification of marine is reported. An integrated method digital holography and Raman spectroscopy aiming at in-situ continuous monitoring particles, particularly deep sea where density extremely low, proposed. A particle located 20 cm water channel was illuminated using collimated wave laser beam which used to take both hologram spectrum identify shape,...
A novel technique to analyse deep-sea particles using digital holography (DH) and Raman spectroscopy (RS) is currently being developed. Since RS requires long measurement periods provide reliable results in water, a flow control system necessary trap the instrument. One way which this can be achieved based on detected DH images that rapidly acquired. In paper, we explore possibility of region proposal detect possible object regions holographic images. model support vector machine (SVM)...