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  • 1
    Electronic Resource
    Electronic Resource
    Fraunhofer holography of small particles (1991)
    Springer
    Applied physics 52 (1991), S. 305-310 
    Details
    ISSN: 1432-0649
    Keywords: 42.40 ; 42.30 ; 06.30C
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The reconstruction of an in-line Fraunhofer (far-field) hologram is re-examined, and an analytical solution of the intensity distribution throughout the entire reconstructed image is presented. The solution bridges the gap between previously documented solutions which are limited to the plane-of-focus image and distant out-of-focus images. The analysis is motivated by a particle velocity measurement technique which attempts to distinguish the focussed image by photographic thresholding. The general methodology is presented for objects of one- and two-dimensional cross-section. Specific results are presented for the single exposure holograms of a long wire and a small particle of circular cross-section. The one-dimensional solution is verified experimentally. The results show precisely how the Fresnel diffraction term creates peaks in the intensity distribution, both upstream and downstream of the focussed image. This characteristic limits the resolution of methods which use thresholding as a means of distinguishing focussed images from their out-of-focus neighbors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325410
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    Paper (German National Licenses)
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  • 2
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    Fraunhofer holography of small particles (1991)
    Springer
    Details
    Publication Date: 1991-04-01
    Print ISSN: 0946-2171
    Electronic ISSN: 1432-0649
    Topics: Physics
    Published by Springer
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  • 3
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    Temperature and Heat Flow Measurements From an Insulated Concrete Bermed Wall and Adjacent Floor (1982)
    American Society of Mechanical Engineers
    Details
    Publication Date: 1982-02-01
    Description: Temperature distributions and heat flows in a bermed concrete wall and concrete floor have been recorded for two years at the Iowa State University Energy Research House. Annual variations are correlated using a third-order Fourier technique. The results for the wall show the importance of interior insulation, exterior insulation near the top, and vertical heat conduction. Seasonal heat transfer through the wall is comparable to that for a well-insulated frame wall of the same surface area above grade. Floor heat-loss is nearly constant but is larger in summer than in winter. Diurnal variation in bermed wall heat flux is caused primarily by changes of indoor air temperature and shows negligible correlation with ambient temperature fluctuations. An analytical model has been developed to predict the soil temperatures adjacent to the bermed wall and floor. Results from the model agree well with the data correlations.
    Print ISSN: 0199-6231
    Electronic ISSN: 1528-8986
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by American Society of Mechanical Engineers
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  • 4
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    An experimental and theoretical study of natural convection in the annulus between horizontal concentric cylinders (1976)
    Cambridge University Press
    Details
    Publication Date: 1976-04-22
    Description: An experimental and theoretical-numerical investigation has been carried out to extend existing knowledge of velocity and temperature distributions and local heat-transfer coefficients for naturel convection within a horizontal annulus. A Mach—Zehnder interferometer was used to determine temperature distributions and local heat-transfer coefficients experimentally. Results were obtained using water and air at atmospheric pressure with a ratio of gap width to inner-cylinder diameter of 0·8. The Rayleigh number based on the gap width varied from 2·11 × 104to 9·76 × 105. A finite-difference method was used to solve the governing constant-property equations numerically. The Rayleigh number was changed from 102 to 105 with the influence of Prandtl number and diameter ratio obtained near a Rayleigh number of 104. Comparisons between the present experimental and numerical results under similar conditions show good agreement. © 1976, Cambridge University Press. All rights reserved.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Cambridge University Press
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