Abstract
The utmost importance of Quantitative Nondestructive Evaluation (QNDE) has been acknowledged in recent years. Accurate extraction of dimensions from fuel element radiographs is one example. Geometric optics was utilized to obtain an exact mathematical formulation of the relations between radiograph parameters (U, Ug, FWHM (full width half maximum)) and geometrical parameters (gap width, source size, angle of unalignment, location of the film with respect to the No-Umbra point, wall width where the gap is located). The simplifying assumptions are stated explicitly, enabling rapid verification of the limits of the present analysis. In addition, the importance of the total reflection was demonstrated. Within the limits imposed by the assumptions, the effect of total reflection should not be disregarded. It was found that when the gap width is smaller than the source size and the wall thickness can be ignored, the gap width has no influence on the FWHM-based measurement of the gap width (usually used when interpreting radiographs without a microdensitometer). In cases in which the wall thickness cannot be ignored (determined and verified from the formulae) there is no one-to-one correspondence between the gap width and the FWHM. This lack of one-to-one correspondence imposes limitations on the range of applicability
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Citation Formats
Baruch, Karp.
Sub-millimetric gap width measurement by finite x-ray source.
Israel: N. p.,
1993.
Web.
Baruch, Karp.
Sub-millimetric gap width measurement by finite x-ray source.
Israel.
Baruch, Karp.
1993.
"Sub-millimetric gap width measurement by finite x-ray source."
Israel.
@misc{etde_10151861,
title = {Sub-millimetric gap width measurement by finite x-ray source}
author = {Baruch, Karp}
abstractNote = {The utmost importance of Quantitative Nondestructive Evaluation (QNDE) has been acknowledged in recent years. Accurate extraction of dimensions from fuel element radiographs is one example. Geometric optics was utilized to obtain an exact mathematical formulation of the relations between radiograph parameters (U, Ug, FWHM (full width half maximum)) and geometrical parameters (gap width, source size, angle of unalignment, location of the film with respect to the No-Umbra point, wall width where the gap is located). The simplifying assumptions are stated explicitly, enabling rapid verification of the limits of the present analysis. In addition, the importance of the total reflection was demonstrated. Within the limits imposed by the assumptions, the effect of total reflection should not be disregarded. It was found that when the gap width is smaller than the source size and the wall thickness can be ignored, the gap width has no influence on the FWHM-based measurement of the gap width (usually used when interpreting radiographs without a microdensitometer). In cases in which the wall thickness cannot be ignored (determined and verified from the formulae) there is no one-to-one correspondence between the gap width and the FWHM. This lack of one-to-one correspondence imposes limitations on the range of applicability of FWHM-based interpretation. These limitations can be overcome by additional information from the U and Ug parameters, which can be determined only with a microdensitometer. As a general procedure it is advised to use a microdensitometer when interpreting radiographs of sub-millimetric gaps. It also seems useful to refer to the present analysis in the design of gap measurement procedures and arrangements. (authors).}
place = {Israel}
year = {1993}
month = {Feb}
}
title = {Sub-millimetric gap width measurement by finite x-ray source}
author = {Baruch, Karp}
abstractNote = {The utmost importance of Quantitative Nondestructive Evaluation (QNDE) has been acknowledged in recent years. Accurate extraction of dimensions from fuel element radiographs is one example. Geometric optics was utilized to obtain an exact mathematical formulation of the relations between radiograph parameters (U, Ug, FWHM (full width half maximum)) and geometrical parameters (gap width, source size, angle of unalignment, location of the film with respect to the No-Umbra point, wall width where the gap is located). The simplifying assumptions are stated explicitly, enabling rapid verification of the limits of the present analysis. In addition, the importance of the total reflection was demonstrated. Within the limits imposed by the assumptions, the effect of total reflection should not be disregarded. It was found that when the gap width is smaller than the source size and the wall thickness can be ignored, the gap width has no influence on the FWHM-based measurement of the gap width (usually used when interpreting radiographs without a microdensitometer). In cases in which the wall thickness cannot be ignored (determined and verified from the formulae) there is no one-to-one correspondence between the gap width and the FWHM. This lack of one-to-one correspondence imposes limitations on the range of applicability of FWHM-based interpretation. These limitations can be overcome by additional information from the U and Ug parameters, which can be determined only with a microdensitometer. As a general procedure it is advised to use a microdensitometer when interpreting radiographs of sub-millimetric gaps. It also seems useful to refer to the present analysis in the design of gap measurement procedures and arrangements. (authors).}
place = {Israel}
year = {1993}
month = {Feb}
}