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  • 1
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    A fiber‐optic probe for particle sizing in concentrated suspensions (1991)
    American Institute of Physics
    Details
    Publication Date: 1991-12-01
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 2
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    Laser Light Scattering with Multiple Scattering Suppression Used to Measure Particle Sizes (1999)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: Laser light scattering is the technique of choice for noninvasively sizing particles in a fluid. The members of the Advanced Technology Development (ATD) project in laser light scattering at the NASA Lewis Research Center have invented, tested, and recently enhanced a simple and elegant way to extend the concentration range of this standard laboratory particle-sizing technique by several orders of magnitude. With this technique, particles from 3 nm to 3 mm can be measured in a solution. Recently, laser light scattering evolved to successfully size particles in both clear solutions and concentrated milky-white solutions. The enhanced technique uses the property of light that causes it to form tall interference patterns at right angles to the scattering plane (perpendicular to the laser beam) when it is scattered from a narrow laser beam. Such multiple-scattered light forms a broad fuzzy halo around the focused beam, which, in turn, forms short interference patterns. By placing two fiber optics on top of each other and perpendicular to the laser beam (see the drawing), and then cross-correlating the signals they produce, only the tall interference patterns formed by singly scattered light are detected. To restate this, unless the two fiber optics see the same interference pattern, the scattered light is not incorporated into the signal. With this technique, only singly scattered light is seen (multiple-scattered light is rejected) because only singly scattered light has an interference pattern tall enough to span both of the fiber-optic pickups. This technique is simple to use, easy to align, and works at any angle. Placing a vertical slit in front of the signal collection fibers enhanced this approach. The slit serves as an optical mask, and it significantly shortens the time needed to collect good data by selectively masking out much of the unwanted light before cross-correlation is applied.
    Keywords: Lasers and Masers
    Type: Research and Technology 1998; NASA/TM-1999-208815
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Development of a versatile laser light scattering instrument (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A versatile laser light scattering (LLS) instrument is developed for use in microgravity to measure microscopic particles of 30 A to above 3 microns. Since it is an optical technique, LLS does not affect the sample being studied. A LLS instrument built from modules allows several configurations, each optimized for a particular experiment. The multiangle LLS instrument can be mounted in the rack in the Space Shuttle and on Space Station Freedom. It is possible that a Space Shuttle glove-box and a lap-top computer containing a correlator card can be used to perform a number of experiments and to demonstrate the technology needed for more elaborate investigations. This offers simple means of flying a great number of experiments without the additional requirements of full-scale flight hardware experiments.
    Keywords: LASERS AND MASERS
    Type: NASA-CR-182474 , NAS 1.26:182474
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Development of a versatile laser light scattering instrument (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: NASA Lewis Research Center is providing and coordinating the technology for placing a compact Laser Light Scattering (LLS) instrument in a microgravity environment. This will be accomplished by defining and assessing user requirements for microgravity experiments, coordinating needed technological developments, and filling technical gaps. This effort is striving to brassboard and evaluate a miniature multi-angle LLS instrument. The progress of the program is reported.
    Keywords: LASERS AND MASERS
    Type: NASA-CR-190739 , NAS 1.26:190739
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Binary Colloidal Alloy Test-3 (BCAT-3) Tabletop Space Station Experiment Continues (2005)
    In:  CASI
    Details
    Publication Date: 2018-06-02
    Description: "As above, so below," thus begins the Emerald Tablet that was inscribed in 300 B.C., long before we could look into the heavens and see a space station that might serve as a platform for exploring other worlds and for exploring the natural ways that order arises out of chaos. To raze the ancient intent of this quote (and lift it out of context), we note that the effects of gravity would be balanced (removed) at the center of the Earth (below) and that this is also the case aboard the International Space Station (above). Yet, those of us on Earth are caught in the middle, where the effects of gravity are profound and disturbing for observers wanting to study nature s self-organizing tendencies, tendencies that are masked by sedimentation and convection on Earth.
    Keywords: Space Processing
    Type: Research and Technology 2004; NASA/TM-2005-213419
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Laser Light Scattering, from an Advanced Technology Development Program to Experiments in a Reduced Gravity Environment (1994)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Recent advancements in laser light scattering hardware are described. These include intelligent single card correlators; active quench/active reset avalanche photodiodes; laser diodes; and fiber optics which were used by or developed for a NASA advanced technology development program. A space shuttle experiment which will employ aspects of these hardware developments is previewed.
    Keywords: LASERS AND MASERS
    Type: NASA-TM-110496 , NAS 1.15:110496 , PAPER-2210-21 , E-9830 , International Symposium on Space Optics; Apr 18, 1994 - Apr 22, 1994; Garmisch-Partenkirchen; Germany
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    A preview of a modular surface light scattering instrument with autotracking optics (1994)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NASA's Advanced Technology Development (ATD) program is sponsoring the development of a new generation of surface light scattering hardware. This instrument is designed to non-invasively measure the surface response function of liquids over a wide range of operating conditions while automatically compensating for a sloshing surface. The surface response function can be used to compute surface tension, properties of monolayers present, viscosity, surface tension gradient and surface temperature. The instrument uses optical and electronic building blocks developed for the laser light scattering program at NASA Lewis along with several unique surface light scattering components. The emphasis of this paper is the compensation for bulk surface motion (slosh). Some data processing background information is also included.
    Keywords: OPTICS
    Type: NASA-TM-110495 , NAS 1.15:110495 , PAPER-2210-29 , International Symposium on Space Optics; Apr 18, 1994 - Apr 22, 1994; Garmisch-Partenkirchen; Germany
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Dynamic Light Scattering With Improved Fiber-Optic Probes (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Improved fiber-optic probes developed for use in dynamic light-scattering measurements. Intended for measuring dynamic backscattering of laser light from concentrated suspensions of particles in liquids, for purpose of determining statistical distributions of sizes of particles. Offers advantages of compactness and ruggedness, and more suitable for industrial environments. Probes immersed in suspensions characterized. Associated lasers, photodetectors, and signal-processing circuits located remotely in safer environments, coupled to probes via optical fibers.
    Keywords: PHYSICAL SCIENCES
    Type: LEW-15461 , NASA Tech Briefs (ISSN 0145-319X); 19; 9; P. 86
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Advanced Colloids Experiment (ACE-H-2) (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Increment 43 - 44 Science Symposium presentation of Advanced Colloids Experiment (ACE-H-2) to RPO. The purpose of this event is for Principal Investigators to present their science objectives, testing approach, and measurement methods to agency scientists, managers, and other investigators.
    Keywords: Nonmetallic Materials; Chemistry and Materials (General)
    Type: GRC-E-DAA-TN20494 , Increment 43 - 44 Science Symposium; Jan 22, 2015; Web Ex; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Structure and Dynamics of Interfaces: Drops and Films (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: We aim to acquire measurements of the structure and dynamics of certain liquid-fluid interfaces using an ensemble of techniques in collaboration: (1) Total internal reflection (TIR) Surface light scattering spectroscopy (SLSS), (2) Brewster angle microscopy (BAM), and (3) Drop-shape analysis. SLSS and BAM can be done on a shared interfacial footprint. Results using a 50-50 mixture of pentane-isohexane, which extends the range of NASA's Confined Vapor Bubble (CVB) experiment, yield surface tension results that differ from the expected Langmuir Fit. These results were confirmed using both the SLSS and drop-shape analysis approaches.
    Keywords: Optics; Instrumentation and Photography; Fluid Mechanics and Thermodynamics
    Type: GRC-E-DAA-TN24608 , International Workshop on Bubble and Drop Interfaces (B&D2015); Jul 06, 2015 - Jul 10, 2015; Potsdam-Golm; Germany
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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