TY - JOUR
T1 - Prediction of measurement error due to low gray scale and spatial resolution of an imaging system on quantification of neutron radiographic image
AU - Hibiki, Takashi
AU - Mishima, Kaichiro
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].
PY - 1997/3/21
Y1 - 1997/3/21
N2 - A study on the effects of image gray scale and pixel number on image quantification was performed analytically and experimentally in order to establish a method of measuring multiphase flows using neutron radiography. It was found from a simplified model that the resolution of an object thickness to be measured had a logarithmic characteristic for the object thickness, and there was a possibility that the measured void fraction in high- and low-void-fraction regions might include large error. It was shown from the numerical analysis that the measurement error would be within 5% except for the annular flow region with the void fraction greater than 90%, when void fraction of an air-water two-phase flow in a channel with the local gap smaller than 9 mm was measured under the condition of the image gray scale = 100. It was revealed from a simplified model that the error due to the number of pixels would be within 5% when the number of pixels projecting the object was ten times greater than that projecting the object boundary.
AB - A study on the effects of image gray scale and pixel number on image quantification was performed analytically and experimentally in order to establish a method of measuring multiphase flows using neutron radiography. It was found from a simplified model that the resolution of an object thickness to be measured had a logarithmic characteristic for the object thickness, and there was a possibility that the measured void fraction in high- and low-void-fraction regions might include large error. It was shown from the numerical analysis that the measurement error would be within 5% except for the annular flow region with the void fraction greater than 90%, when void fraction of an air-water two-phase flow in a channel with the local gap smaller than 9 mm was measured under the condition of the image gray scale = 100. It was revealed from a simplified model that the error due to the number of pixels would be within 5% when the number of pixels projecting the object was ten times greater than that projecting the object boundary.
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U2 - 10.1016/S0168-9002(97)00315-X
DO - 10.1016/S0168-9002(97)00315-X
M3 - RGC 21 - Publication in refereed journal
SN - 0168-9002
VL - 388
SP - 204
EP - 211
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 1-2
ER -