为获得样品多点数据，光谱共焦位移传感系统在移动测量时会产生抖动效应，引起测量数据发生漂移，文中基于已实现的光谱共焦厚度测量系统，研究抖动的影响并探究抖动补偿算法。首先，基于光谱共焦厚度测量模型及抖动存在时探头相对于光轴发生一定倾斜，推导了抖动对厚度测量影响的关系模型，并采用蒙特卡洛法分析了4种样品在不同程度随机抖动下的厚度概率密度函数，将解析结果与蒙特卡洛仿真结果进行比较，验证了厚度概率密度函数表达式的正确性。结果表明：抖动效应导致测量性能下降，尤其在样品厚度较大时；而抖动标准差较大时，较薄的样品具有更好的抗抖动性能；为补偿抖动的影响，提出采用Savitzky-Golay滤波及高斯拟合实现滤波和光谱信号峰值波长的提取，并建立了抖动误差补偿算法；最后，对厚度为(1.0±0.1) mm的样品进行实验测量，测得平均厚度为1.0640 mm，补偿后的相对标准偏差为0.29%，验证了抖动补偿算法的有效性。文中的研究内容对提高系统测量稳定性及测量精度有一定的指导意义。

研究了基于里德堡原子电磁诱导透明效应的耦合光一维驻波场增强的微波电场传感。利用模式匹配反射光场，在高增透镀膜的铯原子气室中形成了里德堡原子三能级体系中耦合光的一维驻波场，并在此基础上进行了幅度调制微波电场测量。实验结果表明，在不额外增加耦合光激光器输出功率的情况下，一维耦合光驻波场导致了耦合光功率的相干增强，电磁诱导透明光谱强度和线宽都显著增加。详细比较了一维驻波场增强与直接增加耦合光功率在测量不同功率微波时的表现，结果表明在较低微波功率下一维驻波场增强测量微波频率信噪比提升约4 dB，瞬时带宽增加1.38倍，同时频率响应曲线更为平坦；在较高微波功率条件下，无驻波场存在的微波响应曲线呈现出明显的双峰形态，而一维驻波场的形成可有效消除双峰特征，表现为平坦响应特征。研究结果对实现低功耗、频率响应曲线平坦、自校准微波电场测量传感器具有重要的参考价值。

与白光X射线动态显微CT（Micro Computed Tomography）相比，单色光X射线动态显微CT具有较低的辐射损伤和较高的密度分辨率，但是更难以平衡其空间和时间分辨率。目前，单色光X射线动态显微CT的最高时间分辨率可达到13.3 Hz，探测器有效像素尺寸为5 μm。为了构建具有更高时空分辨率的单色光X射线动态显微CT系统，基于上海光源快速X光成像线站（BL16U2）的高通量密度单色光，将高速转台与三镜头大数值孔径快速X射线成像探测器相结合，构建了实验系统。以速发型聚氨酯材料为研究对象进行了验证实验，在15 keV单色光下动态显微CT的时间分辨率达到了20 Hz，探测器有效像素尺寸为2.2 μm。对气泡运动进行相关定量分析，证明该系统具有高时空分辨率和高对比度分辨率，可以对复杂运动系统进行四维时空定量分析，为BL16U2线站用户进行高时空分辨率的复杂原位研究提供了强大的实验平台。

At present, reconstruction of megapixel and high-fidelity images with few measurements is a major challenge for X-ray ghost imaging (XGI). The available strategies require massive measurements and reconstruct low-fidelity images of less than 300×300 pixels. Inspired by the concept of synthetic aperture radar, synthetic aperture XGI (SAXGI) integrated with compressive sensing is proposed to solve this problem with a binned detector in the object arm. Experimental results demonstrated that SAXGI can accurately reconstruct the 1200×1200 pixels image of a binary sample of tangled strands of tungsten fiber from 660 measurements. Accordingly, SAXGI is a promising solution for the practical application of XGI.

Carbon fiber (CF)/pyrolytic graphite (PG) composites are promising structural materials for molten salt reactors because of their superior performance. Due to the minor density difference between CF and PG, existing methods are impractical for efficient three-dimensional characterization of CF/PG composites. Therefore, in this study, a method based on in-line phase-contrast X-ray microtomography was developed to solve the aforementioned problem. Experimental results demonstrate that the method is suitable for comprehensive characterization of CF/PG composites. The relationship between the microporous defects and fiber orientations of such composites was also elucidated. The findings can be useful for improving the manufacturing process of CF/PG composites.