摘要：力觉是仿生体智能感知的重要内容,本文提出一种基于光纤布拉格光栅双层分布式阵列单元的力觉传感器。基于光纤布拉格光栅的传感机理,设计了一种十字型光纤布拉格光栅阵列单元,埋置入聚合物材料中并进行了仿真分析。搭建力觉传感实验平台,完成了温度,压力和剪切力传感实验并进行了重复性分析。仿真和实验结果表明,该力觉传感器能实现力觉信息检测,并具有良好的线性度和重复性。FBG1和FBG2的温度灵敏度分别为13.3 pm/℃和12.8 pm/℃;FBG1和FBG2的正向压力灵敏度分别为0.0258 nm/N和0.0284 nm/N,百分误差平均值分别为2.77%和2.59%;FBG1 x正向剪切力灵敏度为0.0536 nm/N,百分误差平均值为3.77%。该传感器有望应用于力觉传感领域,具有一定的应用价值。

摘要：针对仿生皮肤柔性触滑觉复合传感问题,提出了一种基于光纤布拉格光栅的双层分布式传感单元。首先,研究了光纤布拉格光栅的传感机理,推导了基于参考光栅的温度补偿原理;然后,利用聚合物弹性材料对光纤布拉格光栅传感阵列进行保护性和增敏性封装,设计了双层"十字型"的分布式传感阵列单元,并对传感阵列单元压力灵敏度进行了仿真分析研究;最后,搭建实验系统平台,对柔性复合传感器进行了温度、触觉和滑觉传感实验。仿真和实验结果表明,该柔性触滑觉传感器具有良好的线性度和响应速度,温度灵敏度为13 pm/℃,是裸光纤布拉格光栅的1.31倍;正向压力灵敏度为7.289 nm/MPa,x正向和x负向剪切力灵敏度分别为0.060 2和0.063 6 nm/N;由滑觉传感特征信号可以获取物体的滑移信息。该传感器有望表贴或埋置于仿生手内部,对实现仿生手触滑觉信息感知具有一定的应用价值。

摘要：针对传统流量计测量参数单一和流量温度复合测量困难的问题,提出了一种基于光纤布拉格光栅的流量温度复合传感器。采用空心圆柱悬臂梁,减小了流体的压力损失,对端盖、悬臂梁和靶盘采用一体加工,增加了传感器的稳定性。首先,结合光纤布拉格光栅传感理论和流量温度复合传感理论,研究了基于光纤布拉格光栅的流量温度复合传感机理;然后,设计了悬臂梁为空心圆柱的一体靶式结构的传感器,并进行了仿真分析研究;最后,搭建了流量温度实验系统平台,进行了温度和流量传感实验。研究结果表明,温度与波长漂移量呈线性变化关系,线性度均在99%以上,传感器对温度的分辨率为0.04℃,温度测量误差为1.8%,流量分辨率为0.33 m^(3)/h,流量测量误差为2%。该光纤布拉格光栅复合传感器可实现对流量和温度的复合测量,有望于应用在需要大规模组网检测的流量测量系统中,具有较好的应用前景。

摘要：Utilizing single atom sites doping into metal oxides to modulate their intrinsic active sites,achieving precise selectivity control in complex organic reactions,is a highly desirable yet challenging ***,identifying the active site also represents a significant obstacle,primarily due to the intricate electronic environment of single atom site doped metal ***,a single atom Cu doped TiO_(2)catalyst(Cu_(1)-TiO_(2))is prepared via a simple“colloid-acid treatment”strategy,which switches aniline oxidation selectivity of TiO_(2)from azoxybenzene to nitrosobenzene,without using additives or changing solvent,while other metal or nonmetal doped TiO_(2)did not *** mechanistic investigations and DFT calculations unveil that Ti-O active site is responsible for triggering the aniline to form a new PhNOH intermediate,two PhNOH condense to azoxybenzene over TiO_(2)*** for Cu_(1)-TiO_(2),the charge-specific distribution between the isolated Cu and TiO_(2)generates unique Cu_(1)-O-Ti hybridization structure with nine catalytic active sites,eight of them make PhNOH take place spontaneous dissociation to produce *** work not only unveils a new mechanistic pathway featuring the PhNOH intermediate in aniline oxidation for the first time but also presents a novel approach for constructing single-atom doped metal oxides and exploring their intricate active sites.