Particle Field Holography PDF Download
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Author: Chandra S. Vikram
Publisher: Cambridge University Press
ISBN: 0521411270
Category : Science
Languages : en
Pages : 287
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Book Description
This is the first book to provide a thorough and systematic description of the entire subject of particle field holography. The use of holography to study very small objects in a dynamic volume is a technique of importance for scientists and engineers across a variety of disciplines for obtaining information about the size, shape and velocity of small objects, such as dust particles, fuel droplets, raindrops, pollen, and bubbles. Professor Vikram has made major contributions to the field, and here provides a coherent, comprehensive and self-contained treatment of the theory, practice and applications. The volume is written to satisfy the needs of researchers in the technique, practicing engineers dealing with applications, and advanced students in science or engineering departments. All the necessary mathematical formulations, figures and photographs, experimental procedures and results, and literature citations are therefore included.
Author: Chandra S. Vikram
Publisher: Cambridge University Press
ISBN: 0521411270
Category : Science
Languages : en
Pages : 287
Get Book Here
Book Description
This is the first book to provide a thorough and systematic description of the entire subject of particle field holography. The use of holography to study very small objects in a dynamic volume is a technique of importance for scientists and engineers across a variety of disciplines for obtaining information about the size, shape and velocity of small objects, such as dust particles, fuel droplets, raindrops, pollen, and bubbles. Professor Vikram has made major contributions to the field, and here provides a coherent, comprehensive and self-contained treatment of the theory, practice and applications. The volume is written to satisfy the needs of researchers in the technique, practicing engineers dealing with applications, and advanced students in science or engineering departments. All the necessary mathematical formulations, figures and photographs, experimental procedures and results, and literature citations are therefore included.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
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Book Description
An in-line holographic imaging system has been developed for hydrodynamic experiments at the Pegasus facility located at Los Alamos National Laboratory. Holography offers the unique capability to record distributions of particles over a three dimensional volume. The system to be discussed is used to measure particle distributions of ejecta emitted after a cylindrical aluminum liner (5.0 cm in diameter, 2.0 cm high) impacts a target (3.0 cm in diameter). The ejecta emerges from the target traveling up to 7mm/[mu]s and moves toward the axial center of the system where the holographic imaging is performed. In-line holography is particularly suited for the Pegasus pulsed power facility where the geometry restrictions make off axis holography impractical. In order to record the fast moving particles a frequency-doubled Nd:-YAG laser system has been implemented which produces a 80 ps 20 millijoule pulse at 532 nm. An optical relay system composed of a Fourier optical lens pair has been developed which is placed 4.0 cm from the center of the region of interest. This relay lens pair forms an intermediate image 32 cm from the object plane and the hologram is placed 4cm downstream of the intermediate image. The holographic system and resolution capability are discussed.
Author: Robert L. Kurtz
Publisher:
ISBN:
Category : Holography
Languages : en
Pages : 28
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Book Description
Depending on the mechanism of particle production, the resultant particle size and velocity distribution may range over several orders of magnitude. In general, if particle size information is desired from a given type generator, one must resort to some form of experimental determination of the distribution. If the source of particle production is a dynamic one involving a reasonable volume, holography provides a tailor-made particle size and velocity distribution detector. This is evidenced by the fact that holography allows the entire volume to be recorded on one exposure without any interference with the volume of interest. Herein lies a very important characteristic of the holographic particle detection technique: It provides a holographic nondestructive testing technique in the fullest sense of the definition of nondestructive testing. This report provides a description of three different systems useful in this technique and includes the experimental results from one of the holographic systems which was used to detect particle size and velocity distribution from the Skylab waste tank.
Author: Melde, Kai
Publisher: KIT Scientific Publishing
ISBN: 3731509466
Category : Technology & Engineering
Languages : en
Pages : 152
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Book Description
Author: Jeremy Christopher De Jong
Publisher:
ISBN:
Category :
Languages : en
Pages : 174
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Book Description
?Pub Inc Collision and coagulation processes of inertial particles suspended in turbulence are of considerable significance in a wide variety of both natural and industrial flows. Due to the complex nature of these processes, they are typically studied through the use of direct numerical simulations (DNS). However, these exists a pressing need to experimentally validate the DNS results. In this regard, we utilize digital particle holography to study a dynamic particle field in a stationary, homogenous and isotropic turbulent flow and evaluate important collision parameters such as the radial distribution function (RDF) and the radial relative velocity probability density function (PDF). We compare the experimental results with those obtain by DNS under similar flow and particle conditions and define correction factors that must be applied to the DNS to account for limitations and uncertainties inherent in experimental measurements. These factors include correction for the limited experimental volume, a polydisperse particle size distribution, lower dimensional measurements and uncertainties in the measured particle locations. Additionally, we defined a particle signature function that enhances the ability to distinguish real particles from noise in numerically reconstructed digital holograms and developed a method the uses inertial range fitting of the second order velocity structure function determine the dissipation rate inside a stationary turbulence chamber that allows complete characterization of the flow.
Author: Robert L. Kurtz
Publisher:
ISBN:
Category : Holography
Languages : en
Pages : 16
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Book Description
Author: Chandra S. Vikram
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 636
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Book Description
Author: Robert L. Kurtz
Publisher:
ISBN:
Category : Cloud physics
Languages : en
Pages : 84
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Book Description
A complete description of holography is provided, both for the time-dependent case of moving scene holography and for the time-independent case of stationary holography. Further, a specific holographic arrangement is proposed for application to the detection of particle size distribution in an atmospheric simulation cloud chamber. In this chamber particle growth rate is investigated; therefore, the proposed holographic system must capture continuous particle motion in real time. Such a system is described.
Author: J. D. Trolinger
Publisher:
ISBN:
Category :
Languages : en
Pages : 96
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Book Description
The purpose of this work is to establish the feasibility of using a Fourier transform analysis to automatically extract size distribution from particle field off-axis holograms. Both experimental and theoretical studies were conducted to show that this technique is feasible. A holographic system was designed and built compatible for use with a commercially available Fourier transform analyzer and software. Holograms of a standard particle field were obtained, and scattered light of both the particle field and its hologram were Fourier transform analyzed. The Sauter mean diameter determined by the two methods agreed to within 5%. The experimental and theoretical studies show that the prediction of the size distribution could be improved by increasing the diffraction efficiency of the hologram. This can be accomplished by producing phase holograms. Spray holograms were also Fourier transform analyzed at various locations of the spray. Photographs of the spray are provided for comparison. The results of this phase show that this method will yield very fast analysis of large amounts of holographic data.
Author: J. D. Trolinger
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
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Book Description
A brief review of the techniques of small-particle holography is presented. These results are extended in an elementary way to show that multiple-exposure holography can be used to study the dynamic properties of particle fields. Experimental techniques for performing such a study are then described. Finally, as a typical example, a multiple-exposure hologram of an aerosol is presented with a portion of the data extracted from it. The hologram exhibits a vast amount of information including the determination of the velocity field, density field, size distribution, flow structure, and diffusion rate. (Author).
