プローブとして中性子を用いた金属管内気液二相流の可視化と計測 : 第4報, 画像定量化に及ぼす階調度および計測画素数の影響

概要

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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 logarithmic characteristics for the object thickness, and there is 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 9mm 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 is ten times greater than that projecting the object boundary.
1996-05-25