共查询到20条相似文献,搜索用时 78 毫秒
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超薄硅双面抛光片抛光工艺技术 总被引:2,自引:0,他引:2
MEMS器件、保护电路、空间太阳电池等的制作需要使用硅双面抛光片,并且要求抛光片的厚度很薄,传统的硅抛光片加工工艺已经不能满足这一要求.介绍了一种用于超薄硅单晶双面抛光片加工的抛光工艺方法.通过对硅片抛光机理[1],抛光方式、抛光工艺的研究和对抛光工艺试验结果的分析,解决了超薄硅单晶双面抛光片在加工过程中碎片率高、抛光... 相似文献
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推导了适合于光学设计/评价程序编程的复杂全息光学元件的光线追迹公式和算法,复杂全息光学元件指记录波前为非球面和面形亦为非球面。 相似文献
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PSD(Power Spectral Density)作为一种新型、有效的评价参数已被广泛用于大口径光学元件表面加工质量评价.由于它具有在频域内对波前畸变进行描述的功能,使得在不同频率范围内对波前畸变分别进行分析成为可能,进而可以更有针对性的对中频波前畸变(造成小尺度自聚焦这类非线性危害的主要畸变频段)进行有效的控制.本文利用PSD的频谱描述功能对其进行了较深入的分析、运算,对高功率激光系统的激光波前以及不同的调制情况进行了初步的模拟计算.分别得到了不同调制频率和不同调制深度情况下的PSD曲线及其变化规律,初步明晰了PSD曲线对不同调制频率信息和不同调制深度信息的响应情况.(OH17) 相似文献
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晶片双面磨抛设备主要用于双面磨抛晶片,其压力控制的精度、速度以及稳定性是影响晶片磨抛质量和磨抛效率的关键性指标,为了满足双面磨抛设备对压力的控制要求,设计了闭环压力控制系统,通过动态调整控制参数实现了对压力的精确控制. 相似文献
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为了研究以激光为热源开展材料高温力学性能测试的可行性,建立理论模型与数值模型,分析了材料在双面均匀激光光斑加热下的表面及内部温升。结果表明,理想情况下采用均匀化激光双面辐照的加热方式可以在试件加热区域内形成较均匀的温度场。为验证上述结论,建立了光斑匀化度达92%的激光双面辐照热力耦合测试试验平台,并基于相关测试方法获取了传统加热方式难以快速加热的CFRP层合板高温拉伸强度。结果表明,试件在激光加热中心测试区域(10 mm×10 mm)内的温度均匀性良好。试件在均匀化激光双面辐照下可被快速加热至923℃,测试区域内的最大温度波动为6.8%。文中提出的基于均匀化激光双面辐照的热力耦合测试方法相比传统测试方法具有通用性好、温升率高、测试温度高、测试效率高等一系列的优点。该研究可为进一步研制通用型材料/结构高温升率、高温力学性能试验系统提供关键技术支撑。 相似文献
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A novel 180deg out-of-phase power divider based on double-sided parallel striplines (DSPSL) is proposed. The proposed power divider has a relative bandwidth of about 100%. The 180deg out-of-phase characteristic between the two output ports is frequency independent, which is suitable for various applications of wide bandwidth. In addition, the characteristic impedance of the transmission lines for the input and output is 50 Omega, and it allows easy integration with other microwave components. The proposed power divider has been demonstrated and verified. The experimental results are presented and show good performance 相似文献
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Distribution forms of abrasives in the chemical mechanical polishing (CMP) process are analyzed based on experimental results.Then the relationships between the wafer,the abrasive and the polishing pad are analyzed based on kinematics and contact mechanics.According to the track length of abrasives on the wafer surface,the relationships between the material removal rate and the polishing velocity are obtained.The analysis results are in accord with the experimental results.The conclusion provides a theoretical guide for further understanding the material removal mechanism of wafers in CMP. 相似文献
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针对钛宝石晶体表面低损伤加工进行了系统研究,在CCOS数控小磨头抛光机上进行了正交实验,选用不同的抛光液对钛宝石进行化学机械抛光,有效去除精磨阶段的亚表面损伤,实验证明SiO2硅溶液作为磨料的抛光效果好,适合作为钛宝石加工的抛光液。研究了抛光盘种类、抛光盘压力、抛光盘速度、硅溶胶稀释浓度这四个因素和钛宝石晶体表面粗糙度和表面疵病的关系,并获得钛宝石低缺陷加工过程中工艺参数的影响规律。按照优化后的工艺参数进行实验,获得了低缺陷、高精度的钛宝石表面。运用灰色关联分析法对抛光参数进行优化,在最佳加工工艺组合条件下,得到钛宝石表面粗糙度为0.262 nm,表面疵病率为1.410-3 mm-1。 相似文献
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硅片化学机械抛光(CMP)是机械作用与化学作用相结合的技术,硅片表面的化学反应层主要是由抛光液中磨料的机械作用去除,磨粒对硅片表面的摩擦和划擦对硅片表面材料的去除起着重要作用。磨粒在硅片表面上的划痕长度直接影响硅片表面的材料去除率。本文首先在实验结果的基础上分析了硅片CMP过程中磨粒的分布形式,然后根据运动学和接触力学理论,分析了硅片、磨粒及抛光垫三者之间的运动关系,根据磨粒在硅片表面上的运动轨迹长度,得出了材料去除率与抛光速度之间的关系,该分析结果与实验结果一致,研究结果可为进一步理解硅片CMP的材料去除机理提供理论指导。 相似文献
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凸光学元件在磁流变抛光区域的几何特性对制造高精度、高表面完整性光学元件有重要影响,凸光学元件曲率、嵌入深度与角度的变化将引起磁流变抛光区域压力场的变化。为了研究凸光学元件不同的曲率、嵌入深度与嵌入角度下抛光区域的压力场,首先通过建立磁流变抛光过程中压力模型,对抛光区域的压力进行分析;其次基于Kahan数值方法建立了多场耦合积分的快速计算方法。最后,计算凸光学元件在不同曲率、嵌入深度及角度下得到磁流变抛光区域压力场分布,研究凸元件在磁流变抛光区域受几何特性影响的工艺规律;得出结论:在磁流变抛光过程中通过改变凸光学元件曲率、相同曲率下的嵌入深度以及角度的情况下,当加工凸元件曲率增大时,磁流变抛光区域压力场会随之增大;当凸元件曲率一定、嵌入深度逐渐变深时,磁流变抛光区域压力场会增大;当凸元件曲率一定、嵌入角度增加时,磁流变抛光区域压力场会随角度先增大再减小。 相似文献
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提出了一种基于深度神经网络的提高材料去除模型精度的策略。提出一种具有特征选择能力的深度学习算法。在机器人抛光的材料去除率模型的基础上,生成由材料去除率和相应的抛光参数组成的一系列仿真样本。深度学习算法学习了仿真样本和实际样本,建立了深度学习模型。通过使用所提出的深度学习模型,根据抛光参数,估测测试样本的材料去除深度,并计算估测了测试样本的材料去除深度与实际的测试样本的材料去除深度之间的误差。结果表明:改进后的模型可以获得比传统模型更高的精度。 相似文献
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《Electron Devices, IEEE Transactions on》1974,21(11):730-731
The avalanche breakdown voltage of an abrupt double-sided junction is a function only of Neff (the doping obtained from capacitance-voltage analysis) in a material in which the ionization rates for electrons and holes are equal or maintain a constant ratio. This doping parameter, together with the published breakdown voltage data for single-sided junctions, immediately gives the breakdown voltage of the more complex structure. 相似文献
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The electromagnetic shielding film has drawn much attention due to its wide applications in the integrated circuit package, which demands a high surface quality of epoxy resin. However, gaseous Cu will splash and adhere to epoxy resin surface when the Cu layer in PCB receives enough energy in the process of laser cutting, which has a negative effect on the quality of the shielding film. Laser polishing technology can solve this problem and it can effectively improve the quality of epoxy resin surface. The paper studies the mechanism of Cu powder spraying on the compound surface by 355 nm ultraviolet (UV) laser, including the parameters of laser polishing process and the remains of Cu content on compound surface. The results show that minimal Cu content can be realized with a scanning speed of 700 mm/s, a laser frequency of 50 kHz and the distance between laser focus and product top surface of -1.3 mm. This result is important to obtain an epoxy resin surface with high quality. 相似文献
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By designing the ordered structure on the key physical dimensions, metamaterial can obtain extraordinary physical properties. The method gives transparent conductive absorbing metamaterial with broadband and high absorptivity. In this paper, a kind of absorbing metamaterial with indium tin oxide (ITO) glass substrate is designed. The design method of double-sided etched an open loop and linear metamaterial periodic structures is adopted. The thickness of the absorbing metamaterial is 2.5 mm. The research shows that the working bandwidth is between 8.9 GHz and 17.4 GHz, the absorption rate is 90%, and the transmittance of visible light is 85% on average. The absorbing metamaterial has wide application value to solve the problem of visualization and absorption characteristics. 相似文献