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- The ratio of the focal length of a lens or lens system to the effective diameter of its aperture. F值物镜或物镜系统的焦距与入射光孔直径之比
- Usually, a large aperture lens will give better results. 若使用大光圈的镜头,效果当然更理想。
- Has two converging lens system; the objective and the eyepiece. 有两个会聚镜头系统;物镜和目镜。
- The usually circular area in which the image is rendered by the lens system of an optical instrument. 视区光学仪器的透镜系统所能看到的通常是圆周的区域
- Based on Collins formula and ABCD propagation matrix theory,the propagations of laser beams with different profiles through an aperture lens are analyzed and compared under the same laser beam power and initial beam width in this paper. 基于柯林斯公式和ABCD传输矩阵理论 ,在相同激光功率和初始束宽下 ,研究了不同空间分布光束通过聚焦光学系统的传输特性。
- Abstract: From the Helmholtz equation, the optical field analytical expression of an ultrashort pulse propagating through a small aperture lens was acquired with chromatic and spherical aberration. 摘 要: 从亥姆霍兹方程出发,考虑透镜的色差和球差,得到了超短脉冲经过小数值口径透镜后光场的解析表达式;
- Imagine that we have some sort of Lens system which forms an image of an extended object. 设想我们有某种透镜系统,它对一个扩展物体成象。
- From the Helmholtz equation, the optical field analytical expression of an ultrashort pulse propagating through a small aperture lens was acquired with chromatic and spherical aberration. 摘要从亥姆霍兹方程出发,考虑透镜的色差和球差,得到了超短脉冲经过小数值口径透镜后光场的解析表达式;
- Compound lens or lens system designed to be free of astigmatism and able to form approximately point images. 没有散光并且能够形成近似的图像的。
- From the propagation theory of partially coherent light, spectral anomalies and spectral switches of Gaussian Schell-model beams focused by an astigmatic aperture lens are studied. 从部分相干光的传输理论出发,研究了高斯谢尔模型光束通过光阑像散透镜聚焦的光谱异变和光谱开关。
- An achromatic lens system may consists of several cemented or separated groups of orown and flint glasses. 一个消色差的透镜系统可由若干个互相贴合的或互相分离的、由冕玻璃和火石玻璃组成的组元组成。
- The lens or lens system in a microscope or other optical instrument that first receives light rays from the object and forms the image. 物镜首先从物体上接收光线并形成影像的显微镜或其它光学仪器中的透镜或透镜系统。
- Even the simple trilobite has an eye (complete with its double lens system) that's considered an optical miracle by today's standards. 按照今天的标准,即使是简单的三叶虫,它的眼睛(完美的双镜头系统)也是一个光学奇迹。
- The PMW-EX1R features a hand-held design, does not have an interchangeable lens system, and will be available in December 2009 with an MSRP of $7,790. 在PMW-EX1R功能手持设计,目前还没有更换镜头系统,并将于2009年12月与零售价的七七九零美元。
- To evaluate the application value of scanning laser angiography with a wide-field contact lens system in the diagnosis of choroidal melanoma. 评价广角激光扫描血管造影技术在脉络膜黑色素瘤诊断中的应用价值。
- short focal length high aperture lens 短焦距强光力物镜
- Extended Field Elliptical Aperture Lens 可扩展扫描椭圆孔镜头
- The condenser is equipped with an iris diaphragm, a shutter controlled by a lever which is used to regulate the amount of light entering the lens system. 聚光镜装配有瞳孔膜,那是一个有贡杆控制的快门,用来调节进入镜头系统的光量。
- The tectonic-fluid processes are decoupled by interaction of deformation partitioning, tectonic pumping, hydrofracturing and rupture-healing in tectonic lens system. 构造透镜体系统中构造-流体作用是通过变形分解、构造泵吸、液压致裂、裂开-愈合相互有序作用而解耦的。
- In the scope of zoom lens, most of researches focus on traditional zoom lens system, which changes the effect focus by moving the lens along optical axis. 中文摘要在变焦镜头的领域中,大都著重于传统式的变焦系统,其变焦方式是让透镜沿著光轴移动而改变整体的有效焦距。