Particle Size Measurement by In-Line Holography PDF Download
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Author: T. W. Chubb
Publisher:
ISBN:
Category :
Languages : en
Pages : 50
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Book Description
The report is concerned with particle sizing by means of holography which provides a method of reproducing images of small particles dispersed in a volume without the severe difficulty of the limited depth of field of conventional photography and without the disturbance to the sample of collection methods. The size and position of particles may be determined by this method and by extension to double exposure techniques the velocity may also be found. In-line Fraunhofer systems are shown to be especially suitable for particle diameters in the 5 to 500 micron range, provided the maximum recording distance (particle to hologram) does not exceed certain limits set by the smallest particles. (Modified author abstract).
Author: T. W. Chubb
Publisher:
ISBN:
Category :
Languages : en
Pages : 50
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Book Description
The report is concerned with particle sizing by means of holography which provides a method of reproducing images of small particles dispersed in a volume without the severe difficulty of the limited depth of field of conventional photography and without the disturbance to the sample of collection methods. The size and position of particles may be determined by this method and by extension to double exposure techniques the velocity may also be found. In-line Fraunhofer systems are shown to be especially suitable for particle diameters in the 5 to 500 micron range, provided the maximum recording distance (particle to hologram) does not exceed certain limits set by the smallest particles. (Modified author abstract).
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: Robert L. Kurtz
Publisher:
ISBN:
Category : Holography
Languages : en
Pages : 16
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
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Book Description
Digital in-line holography is an optical technique which can be applied to measure the size, three-dimensional position, and three-component velocity of disperse particle fields. This work summarizes recent developments at Sandia National Laboratories focused on improvement in measurement accuracy, experimental validation, and applications to multiphase flows. New routines are presented which reduce the uncertainty in measured position along the optical axis to a fraction of the particle diameter. Furthermore, application to liquid atomization highlights the ability to measure complex, three-dimensional structures. Finally, investigation of particles traveling at near sonic conditions prove accuracy despite significant experimental noise due to shock-waves.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
In-line Fraunhofer holography has been developed and implemented at Los Alamos National Laboratory to measure particle distributions of fast moving particles. Holography is a unique diagnostic that gives unambiguous information on the size and shapes of particle distributions over a three dimensional volume. Currently, the capability of measuring particles two microns in size which travel many mm/[mu]sec has been demonstrated in hydrodynamic experiments at the Pegasus Pulsed Power Facility. Normally, for setting up an in- line holography experiment for measuring particles a few microns in size, the holographic film would be placed less than one centimeter from the particles. However, due to the high energy associated with the dynamic experiment, an optical relay system is used to relay the interference pattern 35 cm so that glass hologram will survive. After the hologram has been made the data must be extracted. This is accomplished by using a laser to reconstruct the data in space. This three dimensional image is then digitized via a CCD camera and a three axis actuator system. After the data has been digitized it is then analyzed with intelligent image processing algorithms. Details will be described below.
Author: Anand Asundi
Publisher: John Wiley & Sons
ISBN: 1119972787
Category : Technology & Engineering
Languages : en
Pages : 189
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Book Description
Approaching the topic of digital holography from the practical perspective of industrial inspection, Digital Holography for MEMS and Microsystem Metrology describes the process of digital holography and its growing applications for MEMS characterization, residual stress measurement, design and evaluation, and device testing and inspection. Asundi also provides a thorough theoretical grounding that enables the reader to understand basic concepts and thus identify areas where this technique can be adopted. This combination of both practical and theoretical approach will ensure the book's relevance and appeal to both researchers and engineers keen to evaluate the potential of digital holography for integration into their existing machines and processes. Addresses particle characterization where digital holography has proven capability for dynamic measurement of particles in 3D for sizing and shape characterization, with applications in microfluidics as well as crystallization and aerosol detection studies. Discusses digital reflection holography, digital transmission holography, digital in-line holography, and digital holographic tomography and applications. Covers other applications including micro-optical and diffractive optical systems and the testing of these components, and bio-imaging.
Author: Daniel J. Stigliani
Publisher:
ISBN:
Category : Cloud physics
Languages : en
Pages : 128
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Book Description
Author: Julian M. Tishkoff
Publisher: ASTM International
ISBN: 9780803102279
Category : Technology & Engineering
Languages : en
Pages : 198
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Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 208
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Book Description
Holography and optical filtering techniques for structural analysis, material tests, and astronomical observation - conference.
Author: Scott Jarrett Forbes
Publisher:
ISBN:
Category :
Languages : en
Pages : 344
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Book Description
