共查询到19条相似文献,搜索用时 93 毫秒
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研制了一种激光共焦扫描显微内窥镜,采用望远式显微内窥光学系统,同时实现长距离的图像中继传输、远心f-theta光学扫描和显微内窥成像功能.二维共焦扫描由双振镜实现,低噪音扫描控制信号由嵌入式系统产生.为实现便携式应用,激光共焦扫描显微内窥镜采用小型化设计方案.首先,体内的显微内窥成像光学系统,外径尺寸为8 mm,工作长度为250.3 mm,可通过标准腹腔镜手术孔进行体内显微内窥成像;其次,采用3 mm通光孔径的小尺寸平面反射镜实现体外共焦扫描,摆动频率为100 Hz,实现快速共焦扫描;最后,激光控制和荧光探测仅通过电缆和光纤与共焦扫描显微内窥镜前端连接,减小了显微内窥镜的前端尺寸和重量.通过实验验证,本系统的成像视场为φ 600 μm,光学分辨率为2.2 μm,可采用手持式或者其他方式工作,进行体内组织的共焦扫描成像,实现微创、在体的荧光显微内窥术. 相似文献
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提出了一种基于斯托克斯(Stokes)参量测量的偏振共焦显微成像新方法。以斯托克斯参量、偏振度、相位差、方位角和椭率角等偏振参量作为成像物理量,通过系统集成方法将斯托克斯参量测量系统整合到共焦显微成像系统,通过共焦显微成像系统的显微物镜将激光聚焦到样品表面,而带有样品偏振信息的反射光进入斯托克斯参量测量系统进行偏振测量,把从斯托克斯参量测量系统中出射的4个斯托克斯光分别聚焦到4个点探测器进行光电探测,实现斯托克斯参量的共焦探测,同时获得同一物点的4个斯托克斯参量以及偏振度、相位差、方位角和椭率角等偏振参量。对样品进行二维扫描,获得不同物点的4个斯托克斯参量及其相关的偏振参量,利用计算机软件进行图像重建,从而获得样品的斯托克斯参量及其相关偏振参量的共焦显微图像。 相似文献
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共焦显微技术越来越广泛地应用于微机电系统和半导体器件的三维轮廓测量。设计一种新型采用变焦透镜作为轴向扫描方式的共焦显微系统,利用变焦透镜的焦距变化来代替传统的轴向位移扫描。系统实现了无机械运动的轴向扫描,消除了传统共焦系统中由位移台移动带来的振动,不仅减小了系统的复杂度,而且降低了成本。进一步设计了基于位移台和变焦透镜的两种共焦检测系统,并且对其进行了仿真实验。实验结果表明:基于位移台和基于变焦透镜的共焦系统的聚焦成像和离焦成像结果类似,并且光强的轴向分布曲线也基本相同,表明此方法可行。 相似文献
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准光共焦波导具有功率容量大、模式密度低的特点,能够有效地减少模式竞争对回旋管互作用的影响,有利于高次谐波太赫兹回旋管的设计.为提高太赫兹准光回旋管的互作用效率,在共焦柱面波导的基础上,研究了一种新型高频互作用结构——双共焦波导结构,设计了一种330 GHz二次谐波双共焦结构回旋管谐振腔并对其进行了理论分析和粒子模拟.研究结果表明,双共焦谐振腔中的高阶模式能够与高次电子回旋谐波发生稳定的相互作用,并且没有模式竞争现象,具备工作在太赫兹波段的潜力.相比普通共焦波导谐振腔,双共焦谐振腔能够增强准光回旋管的注波互作用强度,提高回旋管的输出功率和工作效率.此外,结果还表明双共焦波导中的电磁波模式是一种由两个独立的共焦波导模式叠加而成的混合模式.利用这种混合模式有望实现太赫兹回旋管的单注双频工作,为新型太赫兹辐射源的研究提供了新的途径. 相似文献
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We present a new optical microscope in which the light transmitted by a sample-scanned transmission confocal microscope is frequency-tripled by SiOx nanocrystallites in lieu of being transmitted by a confocal pinhole. This imaging technique offers an increased contrast and a high scattered light rejection. It is demonstrated that the contrast close to the Sparrow resolution limit is enhanced and the sectioning power are increased with respect to the linear confocal detection mode. An experimental implementation is presented and compared with the conventional linear confocal mode. 相似文献
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Confocal enhanced optical coherence tomography for nondestructive evaluation of paints and coatings 总被引:1,自引:0,他引:1
We investigate confocal enhanced optical coherence tomography as a nondestructive evaluation tool for imaging with improved image contrast and depth resolution through a highly scattering paint layer. The depth responses provided by confocal microscopy, optical coherence tomography, and confocal enhanced optical coherence tomography for imaging through paint are investigated. We demonstrate that a new combination of confocal microscopy and optical coherence tomography provides significantly improved resolution and contrast for coherence gated imaging of substrate structures under the paint. 相似文献
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TANG Zhilie XING Da & LIU Songhao . Department of Physics South China Normal University Guangzhou China . School for Information Optoelectronic Science Engineering South China Normal University Guangzhou China Correspondence should be addressed to Tang Zhilie 《中国科学G辑(英文版)》2004,47(1):8-16
ItisreportedrecentlythatnonlinearopticalphenomenonofSHGandTHGhasbeenobservedinmanybiologicaltissues[16].SHGandTHGhavebeenusedtoperformthethree-dimensionalimaginginlivingtissuesandhaveattractedmuchattentionrecently.TherearemanyadvantagesofusingSHGandTHGtoperformthethree-dimensionalimaginginlivingtissues,suchasnoninvasiveandnophotobleaching,inadditiontotheimagingpropertiesofmulti-photonfluorescenceimaging[7—9].Firstly,unlikeinthesingle-andmulti-photonfluorescenceprocesses,onlyvirtualstat… 相似文献
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Poher V Kennedy GT Manning HB Owen DM Zhang HX Gu E Dawson MD French PM Neil MA 《Optics letters》2008,33(16):1813-1815
We describe a simple implementation of a slit scanning confocal microscope to obtain an axial resolution better than that of a point-scanning confocal microscope. Under slit illumination, images of a fluorescent object are captured using an array detector instead of a line detector so that out-of-focus light is recorded and then subtracted from the adjacent images. Axial resolution after background subtraction is 2.2 times better than the slit confocal resolution, and out-of-focus image suppression is calculated to attenuate with defocus faster by 1 order of magnitude than in the point confocal case. 相似文献