为了适应第三代红外焦平面高密度、微型化发展方向,设计了一款大面阵小像元低功耗640×512-5 μm InGaAs短波红外焦平面读出电路。重点研究了3T像素单元简易结构的性能,分析其对芯片暗电流、焦平面噪声的影响,实现了卷帘曝光工作方式、列级缓冲器动态工作以及四通道输出功能。利用可编程增益放大器,实现增益可调以及噪声抑制功能。基于0.18 μm 3.3 V标准CMOS工艺,在输入时钟频率为5 MHz条件下,对小像素单元进行性能分析,阵列窗口进行四通道输出以及线性度仿真。结果表明,电容反馈跨阻放大器（CTIA）输入级偏压变化约30 mV,工作帧频为54 Hz,输出摆幅为1.7 V,最大功耗小于150 mW,线性度为99.987%。

In this paper, Lead-free based on 0.97(K0.48Na0.48Li0.04)(Nb0.8Ta0.2)O₃–0.03Bi0.5Na0.5TiO₃ with additives La₂O₃ (1, 2, 3, 4 wt.%) was prepared by the solid reaction method, and the effect of La dopant on the structural and electrical properties is investigated. The result indicates La dopant considerably decreases the optical band gap compared to the undoped composition. On the other hand, La doping leads to the higher dielectric property in a wider temperature, providing possibilities and directions for the subsequent development of ferroelectric photovoltaic materials with electrical properties and low optical band gap in a dramatical manner.

Atomic and close-to-atomic scale manufacturing (ACSM) aims to provide techniques for manufacturing in various fields, such as circuit manufacturing, high energy physics equipment, and medical devices and materials. The realization of atomic scale material manipulation depending on the theoretical system of classical mechanics faces great challenges. Understanding and using intermolecular and surface forces are the basis for better designing of ACSM. Transformation of atoms based on scanning tunneling microscopy or atomic force microscopy (AFM) is an essential process to regulate intermolecular interactions. Self-assemble process is a thermodynamic process involving complex intermolecular forces. The competition of these interaction determines structure assembly and packing geometry. For typical nanomachining processes including AFM nanomachining and chemical mechanical polishing, the coupling of chemistry and stress (tribochemistry) assists in the removal of surface atoms. Furthermore, based on the principle of triboelectrochemistry, we expect a further reduction of the potential barrier, and a potential application in high-efficiency atoms removal and fabricating functional coating. Future fundamental research is proposed for achieving high-efficiency and high-accuracy manufacturing with the aiding of external field. This review highlights the significant contribution of intermolecular and surface forces to ACSM, and may accelerate its progress in the in-depth investigation of fundamentals.

高浓度的CO₂会对H₂S的检测精度产生较大影响。本文提出了一种基于光纤放大增强型光声光谱的H₂S与CO₂检测技术方案,采用单个分布反馈式激光器串联高功率掺铒光纤放大器作为光声激励光源,实现了对H₂S与CO₂的同时高精度检测。分析了CO₂在所选H₂S吸收线处对H₂S检测产生的干扰,同时利用检测到的CO₂浓度对测量的H₂S浓度进行修正。实验结果表明,修正后的H₂S浓度偏差保持在-5%~5%以内。使用Allan方差分析对系统的检测极限进行了计算,当积分时间为1 s时,该系统对H₂S和CO₂的检测极限分别为656.3×10 ^-9和25.2×10 ^-6;当积分时间为100 s时,系统对H₂S和CO₂的检测极限分别为61×10 ^-9和2.6 ×10 ^-6。计算得到的对H₂S检测的归一化噪声等效吸收系数为5.5×10 ^-9 cm ^-1·W·Hz ^-1/2。本系统具有检测精度高和稳定性好的优点。

均匀性是标准物质三大特性之一。 X射线荧光光谱法(XRF), 精密度高, 可实现多元素同时分析, 是地球化学标准物质均匀性检验重要方法之一。 目前, 应用XRF对标准物质进行均匀性检验还存在争议。 由于均匀性检验要求称样量为最小取样量, 一般地球化学标准物质的最小取样量为0.1 g, 而采用粉末压片-XRF进行均匀性检验时称样量为4 g左右, 得到的结果在理论上不足以支撑样品在最小取样量条件下是否均匀。 本研究改变了以往压片模具的大小, 采用0.1 g样品粉末压片法制样, 在对仪器条件进行优化的基础上, 选取了3个土壤(GBW07425, GBW07428, GBW07388)和3个水系沉积物(GBW07375, GBW07378, GBW07379)标准物质, 每个标准物质取15瓶, 每瓶取样2份, 共制样片30个, 对SiO2, Al2O3, TFe2O3, MgO, CaO, Na2O, K2O, Mn, Ti和P共10个主量组分进行了均匀性检验, 根据单因素方差分析的F值、 测定值的标准偏差(s)和相对标准偏差(RSD)综合判定样品的均匀性。 通过理论计算, 在样品照射半径为5 mm的条件下, 所测10个主量组分的最小取样量小于0.1 g。 0.1 g压片测定结果表明, 本研究中的方法准确度高, 相对误差小于16%, 精密度高, 相对标准偏差不超过4.3%, F值小于临界值, 标准物质的均匀性良好。 在最小取样量为0.1 g的条件下, 应用X-射线荧光光谱法进行均匀性检验, 不仅能够解决地球化学标准物质均匀性检验中长期存在的争议问题, 还可为X-射线荧光光谱法在其他领域的应用提供技术支持。

聚焦型光场相机在运动恢复结构(SFM)和场景重建等领域中的作用日益显现。但是传统SFM算法因聚焦型光场相机具有特殊的结构而难以直接应用。针对这一问题,提出一种完整的聚焦型光场相机等效多目相机模型。在此基础上,利用传统多目相机的SFM算法,给出了适用于聚焦型光场相机的位姿估计算法示例和点云三角化算法示例。最后,通过仿真实验和真实场景重建实验验证了本文等效多目相机模型和SFM算法的正确性,进而表明聚焦型光场相机的SFM问题可以等价为多目相机的SFM问题。