加速器驱动次临界系统（Accelerator Driven Sub-critical System，ADS）是最具潜力的下一代核能系统选型之一，准确评估ADS散裂靶内产生的长寿命放射性核素含量是应用研究中的重要课题，利用质子活化法可以有效评价质子与散裂靶材料发生相互作用产生长寿命核素的反应截面。4个质子辐照天然铅样品分别被能量为40 MeV、70 MeV、100 MeV和400 MeV的质子照射90 min、75 min、40 min和25 min，在冷却约20 a后，利用中国锦屏地下实验室（China Jinping Underground Laboratory，CJPL）的超低本底γ谱仪GeTHU进行测量，使用SAGE（Simulation and Analysis for Germanium Experiments）模拟框架计算了GeTHU的探测效率，测定了能量为40 MeV、70 MeV、100 MeV和400 MeV质子与天然铅发生^natPb（p，x）²⁰⁷Bi和^natPb（p，x）¹⁹⁴Hg反应的总产生截面，并与其他理论及实验工作的结果进行了比较，基于相同样品的实验测量结果在误差范围内保持一致，^natPb（p，x）²⁰⁷Bi的反应截面与TENDL的评价截面更为接近，^natPb（p，x）¹⁹⁴Hg的截面结果与INCL++/ABLA的理论预期保持一致，这些截面结果为ADS设施的放射性废物评估提供了实验依据。

Optical fiber microresonators have attracted considerable interest for acoustic detection because of their compact size and high optical quality. Here, we have proposed, designed, and fabricated a spring-based Fabry–Pérot cavity microresonator for highly sensitive acoustic detection. We observed two resonator vibration modes: one relating to the spring vibration state and the other determined by the point-clamped circular plate vibration mode. We found that the vibration modes can be coupled and optimized by changing the structure size. The proposed resonator is directly 3D printed on an optical fiber tip through two-photon polymerization and is used for acoustic detection and imaging. The experiments show that the device exhibits a high sensitivity and low noise equivalent acoustic signal level of 2.39mPa/Hz1/2 at 75 kHz that can detect weak acoustic waves, which can be used for underwater object imaging. The results demonstrate that the proposed work has great potential in acoustic detection and biomedical imaging applications.

多视角点云配准是逆向工程中的关键步骤之一，具有重要的研究意义和工程应用价值。而对于狭窄场景(如口腔或机械结构内部)获取的点云数据，多视角配准算法的精度直接影响重建精度的好坏。为了提升狭窄场景多视角点云配准的速度和鲁棒性，提出一种基于位姿图优化的增量式多视角点云配准方法。首先针对相邻视角的点云，结合迭代最近点法(ICP)和基于特征的配准方法，提出一种多策略融合的成对点云配准算法，用于求解相邻视角点云的配准结果；然后在增量式相邻视角点云配准的基础上，进一步提出一种基于距离约束的回环检测方法，并依据相邻视角点云的配准结果和回环检测的结果构建位姿图；最后采用实时优化策略对位姿图进行优化，消除累计误差，实现鲁棒的多视角配准。实验结果表明，提出的多策略融合配准算法和基于距离约束的回环检测方法是有效的。经典ICP算法和基于FPFH特征的配准算法在实验中存在失效的现象，而提出的多策略融合配准算法并无失效。基于距离筛选的回环检测方法较常规的回环检测方法效率提高。提出的多视角配准算法在配准牙齿模型数据时精度可达到0.0357 mm。为了验证算法的普适性，采用多个狭窄场景下连续采集的模型点云进行验证，结果表明：提出的算法取得了不错的效果，表明该方法是一种有效的狭窄场景多视角配准方法。

Fringe projection profilometry (FPP) has been extensively studied in the field of three-dimensional (3D) measurement. Although FPP always uses high-frequency fringes to ensure high measurement accuracy, too many patterns are projected to unwrap the phase, which affects the speed of 3D reconstruction. We propose a high-speed 3D shape measurement method using only three high-frequency inner shifting-phase patterns (70 periods), which satisfies both high precision and high measuring speed requirements. Besides, our proposed method obtains the wrapped phase and the fringe order simultaneously without any other information and constraints. The proposed method has successfully reconstructed moving objects with high speed at the camera’s full frame rate (1700 frames per second).