We predicted the attenuated, undesired secondary scattered, and undesired harmonic components of measured X-ray intensities from synchrotron X-ray radiographic visualizations of liquid water in an operating polymer electrolyte membrane (PEM) fuel cell. The undesired secondary scattered component of the measured intensity increased as a function of the liquid water thickness (traversed by the X-ray beam). This increase in the secondary scattered component led to a decrease in the calibrated attenuation coefficient for liquid water, decreasing the accuracy of water quantification. We recommend calibrating the attenuated coefficient with a range of water thicknesses defined by the maximum expected water thickness present in the PEM fuel cell. The undesired harmonic component of the measured intensity also increased as a function of liquid water thickness, which led to a decrease in the accuracy of the measured liquid water thickness.

中文翻译：

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考虑光子散射和谐波的聚合物电解质膜燃料电池的同步加速器X射线射线照相成像

我们从运行中的聚合物电解质膜（PEM）燃料电池中液态水的同步X射线射线照相可视化效果预测了测量X射线强度的衰减，不需要的二次散射和不需要的谐波分量。测量强度的不希望的二次散射分量随液态水厚度（由X射线束穿过）的增加而增加。次级散射成分的增加导致液态水的校准衰减系数降低，从而降低了水定量的准确性。我们建议使用PEM燃料电池中存在的最大预期水厚度定义的水厚度范围来校准衰减系数。