混合式红外焦平面用对焊机的研制

对焊工艺是制备混合红外焦平面器件的关键工艺。本文介绍了我们根据对焊工艺要求自行研制的 HDD-1型红外对焊机的原理、性能及测试方法,并给出了该机在红外焦平面列阵对焊工艺中的试用结果。     

前馈圆极化反射面天线的焦场分析

在大型射电天文望远镜中,研究焦面场的分布对于合理配置馈源阵列具有指导意义。本文采用物理光学法,推导了平面入射波为圆极化、斜入射时,前馈抛物面天线的焦平面及与焦面平行的平面上的电场计算公式。并以我国计划建造的500m 口径球面反射天文望远镜(FAST)为实例,计算了 FAST 的焦面场。     

How close to failure is a granite rock mass at a 5 km depth?

We discuss in this paper the mechanical significance of microseismicity induced by pore pressure variations. Particular attention is given to identifying whether microseismic events reflect only small effective stress perturbations, in a manner somewhat similar to the so-called Kaiser effect, or whether they outline the onset of large-scale failure. This issue is addressed in the context of the development of microseismic activity observed during large-scale water injections conducted in the 5000 m deep experimental geothermal reservoir at Soultz (France). Results from large hydraulic tests together with analysis of borehole images and induced seismicity are integrated to provide a well-constrained characterization of the complete stress field down to 5 km. It is shown that, for this site, pore pressure increments larger than 10% of the natural minimum principal stress magnitude are required for inducing large-scale shear failures that are characterized by a clear structuring of the microseismic events occurrence. But the onset of induced seismicity occurs for much smaller pore pressure variations that only reflect the “elastic” response to changes in local effective stresses. It is concluded that the linear variation with depth of principal stress magnitudes observed in this granite depends on the long-term rheology of this formation rather than on the frictional characteristics of the main faults that affect the massif.     

InSb混合红外焦平面工艺研究

InSb 光伏线列器件是以 n 型 InSb 为衬底,扩散 Cd 形成 p-n 结,经光刻、蒸电极、焊接等工艺制成。SiCCD 为表面 p 沟器件,可按延时积分(TDI)和多路传输(MUX)两种方式工作。在研制1×12、2×12、1×64、2×64元 InSb 光伏线列器件并与 SiCCD 进行互连的基础上,从开发64×64元 InSb 混合红外焦平面着眼,我们进行了64×16元 InSb 光伏面阵的研制,并在 InSb 面阵和 Si 上电镀 In 柱,用我们研制的 HDD-1型红外对准倒焊机进行了对焊,开展了背面辐照 InSb 混合红外焦平面的工艺研究。本文介绍了工艺实验状况,并对工艺实验中有关问题进行了讨论。     

激光焊接入焦量控制的声─电传感器

用麦克风传感器和等离子电荷传感器对大功率激光焊接过程中的等离子体进行检测，发现了人焦量变化与检测信号的对应规律，提出了利用检测信号对最佳熔深入焦量进行控制的方法。     

激光焊接入焦量控制的声─电传感器

用麦克风传感器和等离子电荷传感器对大功率激光焊接过程中的等离子体进行检测，发现了人焦量变化与检测信号的对应规律，提出了利用检测信号对最佳熔深入焦量进行控制的方法。     

基于薄膜结构的MEMS技术研究

报导了基于低应力自支撑SiNx薄膜结构的MEMS部分研究结果,包括从薄膜生长工艺、内应力和薄膜微观结构控制、薄膜的物性分析、镂空自支撑薄膜结构的工艺制作、自支撑薄膜结构动力学的有限元模拟、到最后镂空自支撑薄膜结构在MEMS系统中的应用所做的部分研究工作。     

光学系统离焦对自动调焦评价函数的影响

调焦过程可分为调节物距、调节像距和移动镜头三种情况。基于几何光学关系,推导了三种情况下的弥散斑半径和横向放大率与离焦量的关系。利用数字图像处理方法,模拟了这两个因素对自动调焦评价函数的作用,表明弥散斑的扩散在焦前焦后呈现对称影响,而横向放大率的影响则沿光轴单调下降,二者叠加,造成峰值两侧的不对称。当光学系统F数增大时,调焦评价函数变得平缓,从而使横向放大率的影响变得显著,最佳像面因此向焦前偏移。利用CCD成像的实验证明了上述观点。     

鄂北、豫南现今构造应力场研究

在分析本区震源机制解的基础上 ,结合小震综合断层面解、地应力测量、地壳形变、活动断裂等方面资料 ,将研究区现今构造应力场划分为四个区 ,即 :江汉平原区 (A区 )、桐柏～大别区 (B区 )、鄂西区 (C区 )、鄂西北～豫西南区 (D区 ) ,每个区各具特色。A区主压应力P轴的优选方位为SE12 7° ;B区主压应力轴具两个优选方位 (NE33°、NW 335°) ,反映出与走滑断裂相关的应力分布形式 ;C区主压应力P轴具明显优势方位 :NE6 2° ;D区主压应力P轴和压应力作用区近东西向展布。数值模拟进一步分析表明 :A、B、C、D四区的应力作用机制通过F6、F10 、F11等走滑活动断层处进行分异和转换。     

The visual impact of augmented reality during an assembly task

Many studies have shown the benefits of augmented reality (AR) to improve manufacturing and control processes in industry. However, the presentation of AR content through optical see-through head-mounted displays may induce unnatural viewing conditions, which consequences on the user’s visual system have not been investigated yet. This study aimed at assessing whether using AR instructions to guide a manual task, i.e., conditions where the user is forced to repeatedly look at and accommodate in different planes to extract information from both real and virtual environments, could potentially impact the visual system of operators. A before/after design study was carried out, asking 26 participants to perform Lego assemblies for 30 min with either paper or AR instructions. The effects of using AR compared to paper instructions were evaluated both on binocular vision, with classical optometric measurements, and on visual fatigue, with the Virtual Reality Symptoms Questionnaire. No clinically significant differences in optometric measurements (far/near visual acuity, stereoacuity, phoria, convergence, fusional amplitude, accommodation amplitude, accommodative convergence) have been found between AR and paper instructions, and only negligible fatigue symptoms have been seen specifically for AR. Results from both objective and subjective measurements suggest that there is no impact of AR on the oculomotor system and that, in this specific case of use, AR can be safely used for production operators.