O436.1 2003042422多相位256×256衍射微透镜的设计及其光学性能研究=Design and optical performance of 256×256 multi-phasediffractive microlens arrays[刊,中]/孔令彬(中国地质大学机电系.湖北,武汉(430074)),叶敦范…...O436.1 2003042422多相位256×256衍射微透镜的设计及其光学性能研究=Design and optical performance of 256×256 multi-phasediffractive microlens arrays[刊,中]/孔令彬(中国地质大学机电系.湖北,武汉(430074)),叶敦范…∥红外与激光工程.-2002,31(3).-253-256介绍了衍射微透镜阵列的设计原理与制作工艺方法,在此基础上运用部分刻蚀法研制出适用于3～5μm波长多相位256×256衍射微透镜阵列。利用光通信半导体激光器和探测器建立了一套测试系统,并对所设计的多相位衍射微透镜阵列的衍射率和点扩散函数进行了测试,8相位和16相位石英衍射微透镜的衍射率分别高达80.2%和87.5%,完全满足实际应用的要求。图5参4(高晓萍)O436.1 2003042423用干涉法测量压电陶瓷的动态频率响应特性=Measuringthe dynamic frequency response of piezoelectric ceramic展开更多
O436.1 2001031575莫尔条纹软件计数法=Soft-counting of Moirefringe[刊,中]/吕海宝,曹聚亮,苏绍景(国防科技大学机电工程与自动化学院机电工程所.湖南,长沙(410073))∥光学技术.-2000,26(6).-543-545针对常规莫尔条纹计数法中的缺陷,...O436.1 2001031575莫尔条纹软件计数法=Soft-counting of Moirefringe[刊,中]/吕海宝,曹聚亮,苏绍景(国防科技大学机电工程与自动化学院机电工程所.湖南,长沙(410073))∥光学技术.-2000,26(6).-543-545针对常规莫尔条纹计数法中的缺陷,设计了一种软件计数法,介绍了莫尔条纹软件计算的原理,以及基于DSP的莫尔条纹信号软件的计算的实现。图4参3(李瑞琴)展开更多
Silicon(Si)diffraction microlens arrays are usually used to integrating with infrared focal plane arrays(IRFPAs)to improve their performance.The errors of lithography are unavoidable in the process of the Si diffrac-t...Silicon(Si)diffraction microlens arrays are usually used to integrating with infrared focal plane arrays(IRFPAs)to improve their performance.The errors of lithography are unavoidable in the process of the Si diffrac-tion microlens arrays preparation in the conventional engraving method.It has a serious impact on its performance and subsequent applications.In response to the problem of errors of Si diffraction microlens arrays in the conven-tional method,a novel self-alignment method for high precision Si diffraction microlens arrays preparation is pro-posed.The accuracy of the Si diffractive microlens arrays preparation is determined by the accuracy of the first li-thography mask in the novel self-alignment method.In the subsequent etching,the etched area will be protected by the mask layer and the sacrifice layer or the protective layer.The unprotection area is carved to effectively block the non-etching areas,accurately etch the etching area required,and solve the problem of errors.The high precision Si diffraction microlens arrays are obtained by the novel self-alignment method and the diffraction effi-ciency could reach 92.6%.After integrating with IRFPAs,the average blackbody responsity increased by 8.3%,and the average blackbody detectivity increased by 10.3%.It indicates that the Si diffraction microlens arrays can improve the filling factor and reduce crosstalk of IRFPAs through convergence,thereby improving the perfor-mance of the IRFPAs.The results are of great reference significance for improving their performance through opti-mizing the preparation level of micro nano devices.展开更多
2017 aluminum alloy plates with an ultrafine grained （UFG） structure were produced by equal channel angular processing （ECAP） and then were joined by underwater friction stir welding （underwater FSW）. X-ray diff...2017 aluminum alloy plates with an ultrafine grained （UFG） structure were produced by equal channel angular processing （ECAP） and then were joined by underwater friction stir welding （underwater FSW）. X-ray diffractometer （XRD）, transmission electron microscope （TEM）, scanning electron microscope （SEM） and microhardness tester were adopted to investigate the microstructural and mechanical characteristics of the FSW joint. The results indicate that an ultrafine grained microstructure with the mean grain size of-0.7 Ixm is obtained in the weld nugget by using water cooling. However, The FSW joint exhibits softening compared with the ultrafine grained based material and the heat affected zone （HAZ） has the lowest hardness owing to the coarsening of the strengthening precipitates.展开更多
The auto-evolved ultrafine copper powders were synlhesized via a novel electrodeposition route performed by ultrasonic dispersion of the electrolyte. The properties of the samples obtained were characterized by X-ray ...The auto-evolved ultrafine copper powders were synlhesized via a novel electrodeposition route performed by ultrasonic dispersion of the electrolyte. The properties of the samples obtained were characterized by X-ray powder diffractometry （XRD）, transmission electron microscopy （TEM）, scanning electron microscopy （SEM） and laser size distribution analyzer （SL） respectively. The formation mechanisms of the powders and the efficiency of the elctrodeposition were discussed. The results show that the as-prepared powders are high-purity copper nanoparticles with the fcc structure taking a mixture of fishbone-like and irregular shapes When the concentration of Cu^2＋ increases from 0.03 to 0.09 mol/L, the average size of copper particles increases from 0.92 to 1.80 μm, and current efficiency of electrodeposition linearly changes from 66.5% to 91.3%.展开更多
Zn2GeO4 nanorods were prepared by a surfactant-assisted solution phase route.The as-prepared products were characterized by X-ray powder diffraction(XRD),scanning electron microscopy(SEM),high-resolution transmission ...Zn2GeO4 nanorods were prepared by a surfactant-assisted solution phase route.The as-prepared products were characterized by X-ray powder diffraction(XRD),scanning electron microscopy(SEM),high-resolution transmission electron microscopy(HRTEM),inductively coupled plasma atomic emission spectrometer(ICP-AES),UV-vis diffuse reflection spectroscopy and photoluminescence(PL) spectroscopy.The possible formation mechanism of Zn2GeO4 nanorods was discussed.It was supposed that the CTA+ cations preferentially adsorb on the planes of Zn2GeO4 nanorods,leading to preferential growth along the c-axis to form the Zn2GeO4 rods with larger aspect ratio and higher surface area,which showed the improved photocatalytic activity for photoreduction of CO2.The photoluminescence(PL) property of Zn2GeO4 nanorods was investigated through the emission spectra.展开更多
文摘O436.1 2003042422多相位256×256衍射微透镜的设计及其光学性能研究=Design and optical performance of 256×256 multi-phasediffractive microlens arrays[刊,中]/孔令彬(中国地质大学机电系.湖北,武汉(430074)),叶敦范…∥红外与激光工程.-2002,31(3).-253-256介绍了衍射微透镜阵列的设计原理与制作工艺方法,在此基础上运用部分刻蚀法研制出适用于3～5μm波长多相位256×256衍射微透镜阵列。利用光通信半导体激光器和探测器建立了一套测试系统,并对所设计的多相位衍射微透镜阵列的衍射率和点扩散函数进行了测试,8相位和16相位石英衍射微透镜的衍射率分别高达80.2%和87.5%,完全满足实际应用的要求。图5参4(高晓萍)O436.1 2003042423用干涉法测量压电陶瓷的动态频率响应特性=Measuringthe dynamic frequency response of piezoelectric ceramic
文摘O436.1 2001031575莫尔条纹软件计数法=Soft-counting of Moirefringe[刊,中]/吕海宝,曹聚亮,苏绍景(国防科技大学机电工程与自动化学院机电工程所.湖南,长沙(410073))∥光学技术.-2000,26(6).-543-545针对常规莫尔条纹计数法中的缺陷,设计了一种软件计数法,介绍了莫尔条纹软件计算的原理,以及基于DSP的莫尔条纹信号软件的计算的实现。图4参3(李瑞琴)
基金Supported by the National Natural Science Foundation of China(NSFC 62105100)the National Key research and development program in the 14th five year plan(2021YFA1200700)。
文摘Silicon(Si)diffraction microlens arrays are usually used to integrating with infrared focal plane arrays(IRFPAs)to improve their performance.The errors of lithography are unavoidable in the process of the Si diffrac-tion microlens arrays preparation in the conventional engraving method.It has a serious impact on its performance and subsequent applications.In response to the problem of errors of Si diffraction microlens arrays in the conven-tional method,a novel self-alignment method for high precision Si diffraction microlens arrays preparation is pro-posed.The accuracy of the Si diffractive microlens arrays preparation is determined by the accuracy of the first li-thography mask in the novel self-alignment method.In the subsequent etching,the etched area will be protected by the mask layer and the sacrifice layer or the protective layer.The unprotection area is carved to effectively block the non-etching areas,accurately etch the etching area required,and solve the problem of errors.The high precision Si diffraction microlens arrays are obtained by the novel self-alignment method and the diffraction effi-ciency could reach 92.6%.After integrating with IRFPAs,the average blackbody responsity increased by 8.3%,and the average blackbody detectivity increased by 10.3%.It indicates that the Si diffraction microlens arrays can improve the filling factor and reduce crosstalk of IRFPAs through convergence,thereby improving the perfor-mance of the IRFPAs.The results are of great reference significance for improving their performance through opti-mizing the preparation level of micro nano devices.
基金Projects(50774059, 51074119) supported by the National Natural Science Foundation of China
文摘2017 aluminum alloy plates with an ultrafine grained （UFG） structure were produced by equal channel angular processing （ECAP） and then were joined by underwater friction stir welding （underwater FSW）. X-ray diffractometer （XRD）, transmission electron microscope （TEM）, scanning electron microscope （SEM） and microhardness tester were adopted to investigate the microstructural and mechanical characteristics of the FSW joint. The results indicate that an ultrafine grained microstructure with the mean grain size of-0.7 Ixm is obtained in the weld nugget by using water cooling. However, The FSW joint exhibits softening compared with the ultrafine grained based material and the heat affected zone （HAZ） has the lowest hardness owing to the coarsening of the strengthening precipitates.
基金Project(08JJ3104) support by Hunan Provincial Natural Science Foundation of China
文摘The auto-evolved ultrafine copper powders were synlhesized via a novel electrodeposition route performed by ultrasonic dispersion of the electrolyte. The properties of the samples obtained were characterized by X-ray powder diffractometry （XRD）, transmission electron microscopy （TEM）, scanning electron microscopy （SEM） and laser size distribution analyzer （SL） respectively. The formation mechanisms of the powders and the efficiency of the elctrodeposition were discussed. The results show that the as-prepared powders are high-purity copper nanoparticles with the fcc structure taking a mixture of fishbone-like and irregular shapes When the concentration of Cu^2＋ increases from 0.03 to 0.09 mol/L, the average size of copper particles increases from 0.92 to 1.80 μm, and current efficiency of electrodeposition linearly changes from 66.5% to 91.3%.
基金Project(51208102)supported by the National Natural Science Foundation of China
文摘Zn2GeO4 nanorods were prepared by a surfactant-assisted solution phase route.The as-prepared products were characterized by X-ray powder diffraction(XRD),scanning electron microscopy(SEM),high-resolution transmission electron microscopy(HRTEM),inductively coupled plasma atomic emission spectrometer(ICP-AES),UV-vis diffuse reflection spectroscopy and photoluminescence(PL) spectroscopy.The possible formation mechanism of Zn2GeO4 nanorods was discussed.It was supposed that the CTA+ cations preferentially adsorb on the planes of Zn2GeO4 nanorods,leading to preferential growth along the c-axis to form the Zn2GeO4 rods with larger aspect ratio and higher surface area,which showed the improved photocatalytic activity for photoreduction of CO2.The photoluminescence(PL) property of Zn2GeO4 nanorods was investigated through the emission spectra.
