laser imaging Articles
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Lasernet Fines Q200 – A Solution to Oil Analysis Including Particle Count and Particle Shape Classification
LNF Technology Jointly developed by Lockheed Martin and the Naval Research Laboratory with the Office of Naval Research. LNF is a particle shape classifier that also provides a highly accurate particle count for particles greater than 4 um using laser imaging techniques and advanced image processing software. Silhouette images of all particles larger than 20 um in major dimension are ...
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Dynamic laser speckle and fuzzy mathematical morphology applied to studies of chemotaxis towards hydrocarbons
The movement of the microorganisms towards a higher concentration of the chemical attractant is called positive chemotaxis and is involved in the efficiency of chemical degradation. Several studies are focused in this field related to genomics, and towards demonstrating chemotactic responses by bacteria, but there is little information related to the activity and morphology of their response. In ...
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Instantaneous, two-dimensional, spontaneous Raman measurements of hydrogen number density in a laminar jet using an intra-cavity configuration
In view of the increasing importance of hydrogen as a fuel, we are presenting a novel experimental technique that allows for two-dimensional (2D), spontaneous Raman hydrogen concentration measurements in optically accessible enclosures. The novelty of the technique lies in that the actual experiment takes place in a laser cavity, which significantly enhances the inherently weak hydrogen Raman ...
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How Optical Coatings Impact High-Powered UV Lasers
When thinking of a high powered laser, the image that comes to mind is likely to have some connection to a sci-fi “death ray.” Some planet, some ship, some foe is being instantly reduced to a sub-atomic pile of junk. The truth is there are extremely powerful lasers available in a variety of wavelengths, but they are not used for destructive purposes. High powered lasers, such as those ...
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Transparent exopolymer particles (TEP): A critical factor in aquatic biofilm initiation and fouling on filtration membranes
Transparent exopolymer particles (TEP) are sticky organic microgels, ubiquitous in natural waters, which have been implicated as a potentially important factor in the development of aquatic biofilm. An experimental cross-flow membrane array was used to investigate the relationship between the rate of membrane clogging and levels of TEP and other water quality variables in a lake water source. In ...
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Pilot trial study of a compact macro-filtration membrane bioreactor process for saline wastewater treatment
Conventional membrane bioreactor (MBR) systems have increasingly been studied in recent decades. However, their applications have been limited due to their drawbacks such as low flux, membrane fouling, and high operating cost. In this study, a compact macro-filtration MBR (MfMBR) process was developed by using a large pore size membrane to mitigate the membrane fouling problem. A pilot trial of ...
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Imaging and analysis of chip formation during orthogonal cutting of titanium alloy
Orthogonal cutting of titanium alloy Ti-6Al-4V was investigated in a series of continuous and interrupted turning tests. Direct observation of the chip formation zone was achieved using a high speed imaging system with a long-distance microscope lens. Frame rates from 20,000 to 50,000 frames per second were used to record the chip formation cycle over a range cutting speeds from 4 to 150 m/min ...
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Physico-chemical characterisation versus
in situ micro-structural characterisation of membrane fouling in membrane bioreactorsFouling characteristics of aerobic submerged membrane bioreactors were analysed under two different membrane materials. Polyethersulfone (PES) membranes were found to foul faster at sub-critical flux than polyolefin (PO) membranes. Physico-chemical characterisation, by means of comparison of extracellular polymeric substances (EPS) and soluble microbial products (SMP) concentrations, as well as ...
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Quantitative image analysis of mesoscale biofilm structure with optical coherence tomography. Proceedings WEFTEC.15
Abstract: The metabolic processes supported in a biofilm are often determined by a biofilm’s mesoscale structure (10-4-10-2 meter scale), and mesoscale structure is in turn shaped by the interplay between microbial metabolism and detachment. Despite the widespread adoption of biofilm reactors for water pollution control, much is unknown regarding the relationship between mesoscale biofilm ...
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Laser Diffraction
Particle size measurement using static light scattering The particle size distribution as a parameter to specify a powder or dispersion plays a central role in many applications. Examples are construction material (sands, cements), pharmaceutical development, lime stones, ceramics, colored pigments, fertilizers, emulsions and may more. The range of applications is increasing permanently and hence ...
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Measurement of temperature gradients through local extinction using Raman scattering spectroscopy
Measurements of temperature in laminar flames with localised extinction points were made using line imaging of spectrally resolved laser Raman scattering through the extinction process. A fit to the nitrogen scattering spectrum was used to determine temperature with an accuracy of 30 K. Temperature gradients through the extinction process were measured as the flame strength prior to extinction ...
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On-Site Oil Analysis for Aerospace
When talking about aviation assets one asset stands above the rest - the aircraft. There are approximately thirty thousand airliners in service today, used for both passenger and freight transportation. This number includes hundreds of thousands of individual small aircraft. Today, all of these fleets are growing quickly as the need for air travel continues to increase. Oil analysis is widely ...
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What Is Laser Marking
Laser marking is a high-precision, high-efficiency technology. It has been widely used in various fields. Laser marking can mark various materials permanently and achieve precise pattern, text, and barcode identification. This is important in improving product quality, safety, and brand recognition. This article will explore the principles, application areas, and future laser marking technology ...
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Smart LDAR — more cost-effective?
On December 19, 2008, EPA issued a final rule establishing a voluntary Alternative Work Practice (AWP) to detect leaks of volatile organic compounds (VOC) and hazardous air pollutants (HAP) from process equipment (FR Vol. 73, Number 246), thereby providing the regulated community additional flexibility in complying with leak detection and repair (LDAR) requirements. The AWP allows owners or ...
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