Study of Submicron Particle Size Distribution by Laser Doppler Measurement of Brownian Motion PDF Download
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Author: Wai K. Cheng
Publisher:
ISBN:
Category :
Languages : en
Pages : 93
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Book Description
A theoretical and experimental study on the feasibility of determining the size of a single submicron particle by observing its Brownian motion characteristics has been carried out. The method is based on measurement of the particle motion interferometrically using the light scattered from a pair of intersecting laser beams. The particle is assumed to be in thermal equilibrium with a fluid medium. due to the viscous damping of the fluid, the motion of the particle exhibits relaxation behavior. The relaxation time may be obtained from the interference signal. Knowing the temperature and the viscosity of the fluid, the mass, hence the size of the particle may be determined from the relaxation time. Monte Carlo simulation of the Brownian motion detector response has shown that the relaxation time may be obtained from the statistics of the time between extrema of the signal. A proof-of-concept experiment was conducted using latex spheres of known sizes as test particles. The signal to noise ratio of the experimental setup, however, was not adequate for determining the size of the particles.
Author: Wai K. Cheng
Publisher:
ISBN:
Category :
Languages : en
Pages : 93
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Book Description
A theoretical and experimental study on the feasibility of determining the size of a single submicron particle by observing its Brownian motion characteristics has been carried out. The method is based on measurement of the particle motion interferometrically using the light scattered from a pair of intersecting laser beams. The particle is assumed to be in thermal equilibrium with a fluid medium. due to the viscous damping of the fluid, the motion of the particle exhibits relaxation behavior. The relaxation time may be obtained from the interference signal. Knowing the temperature and the viscosity of the fluid, the mass, hence the size of the particle may be determined from the relaxation time. Monte Carlo simulation of the Brownian motion detector response has shown that the relaxation time may be obtained from the statistics of the time between extrema of the signal. A proof-of-concept experiment was conducted using latex spheres of known sizes as test particles. The signal to noise ratio of the experimental setup, however, was not adequate for determining the size of the particles.
Author: A. C. Stanton
Publisher:
ISBN:
Category :
Languages : en
Pages : 51
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Book Description
Few nonintrusive techniques are available for particle measurements in the submicron size range (
Author: James F. Driscoll
Publisher:
ISBN:
Category :
Languages : en
Pages : 31
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Book Description
The one year research program described here was a direct extension of work completed during the 1977 AFOSR/ASEE Summer Faculty Research program at AFRPL. During that program the author and Dr. David Mann, AFRPL, performed the first is situ size measurements of submicron alumina (Al2O3) particles that have been published to date. The new laser diagnostic technique used, Diffusion Broadening Spectroscopy, represents a new advance in the state-of-the-art of submicron particle sizing. The goal of the research described herein was to develop a data reduction procedure to extend the applicability of the technique, so that size distribution half width can be measured, in addition to particle mean diameter. The computer routine was developed to determine particle mean diameter and size distribution half width, given light scattering data obtained at two scattering angles. Sensitivity of the results was investigated and feasibility of future use of the technique in rocket motors and plumes was deduced. (Author).
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 296
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Book Description
Author: Renliang Xu
Publisher: Springer Science & Business Media
ISBN: 0306471248
Category : Science
Languages : en
Pages : 411
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Book Description
Particle characterization is an important component in product research and development, manufacture, and quality control of particulate materials and an important tool in the frontier of sciences, such as in biotechnology and nanotechnology. This book systematically describes one major branch of modern particle characterization technology - the light scattering methods. This is the first monograph in particle science and technology covering the principles, instrumentation, data interpretation, applications, and latest experimental development in laser diffraction, optical particle counting, photon correlation spectroscopy, and electrophoretic light scattering. In addition, a summary of all major particle sizing and other characterization methods, basic statistics and sample preparation techniques used in particle characterization, as well as almost 500 latest references are provided. The book is a must for industrial users of light scattering techniques characterizing a variety of particulate systems and for undergraduate or graduate students who want to learn how to use light scattering to study particular materials, in chemical engineering, material sciences, physical chemistry and other related fields.
Author: Henk G. Merkus
Publisher: Springer Science & Business Media
ISBN: 1402090161
Category : Technology & Engineering
Languages : en
Pages : 535
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Book Description
This book focuses on the practical aspects of particle size measurement: a major difference with existing books, which have a more theoretical approach. Of course, the emphasis still lies on the measurement techniques. For optimum application, their theoretical background is accompanied by quantitative quality aspects, limitations and problem identification. In addition the book covers the phenomena of sampling and dispersion of powders, either of which may be dominant in the overall analysis error. Moreover, there are chapters on the general aspects of quality for particle size analysis, quality management, reference materials and written standards, in- and on-line measurement, definitions and multilingual terminology, and on the statistics required for adequate interpretation of results. Importantly, a relation is made to product performance, both during processing as well as in final application. In view of its set-up, this book is well suited to support particle size measurement courses.
Author: N. Stanley-Wood
Publisher: Royal Society of Chemistry
ISBN: 0851864872
Category : Science
Languages : en
Pages : 573
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Book Description
Particle Size Analysis reviews the development of particle characterization over the past 25 years and also speculates on its future. Interest in the subject has increased enormously over the years and this book highlights the changes and advances made within the field. This book is comprehensive in its coverage of particle size analysis and includes contributions on such characterization techniques as microscopy using fractal analysis, light diffraction, light scattering with the phase doppler technique, light observation, and photon correlation spectroscopy. A number of chapters address the interest in on-line in-stream particle size analysis and illustrate the progress being made in achieving this long sought after ideal of in-situ in-process particle characterization. Applications to other technological fields are detailed by chapters covering biological systems and the pharmaceutical industry. The subject of surface area determination is considered with particular emphasis on the measurements on porosity of powders, the characterization and comparability of reference materials, and the need for standards. Particle Size Analysis should provide stimulating reading for technologists, scientists, and engineers involved in particle characterization and powder technology worldwide.
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 766
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Book Description
Author:
Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 964
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Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 890
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Book Description
