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Artículos de revistas sobre el tema "F-θ lens"

Autor: Grafiati

Publicado: 25 de enero de 2025

Última modificación: 31 de julio de 2025

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1

Huang, Kuang-Lung, Mei Chu, Cheng-Huan Chen, Yu-Chung Lin, Min-Kai Lee та Sung-Ho Liu. "Enlarging lens design with f-Θ lens for real time laser lithography inspections". Optical Review 18, № 1 (2011): 72–75. http://dx.doi.org/10.1007/s10043-011-0034-y.

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2

Rez, Peter. "Analytic integration of contrast transfer functions." Proceedings, annual meeting, Electron Microscopy Society of America 46 (1988): 822–23. http://dx.doi.org/10.1017/s042482010010617x.

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In high resolution microscopy the image amplitude is given by the convolution of the specimen exit surface wave function and the microscope objective lens transfer function. This is usually done by multiplying the wave function and the transfer function in reciprocal space and integrating over the effective aperture. For very thin specimens the scattering can be represented by a weak phase object and the amplitude observed in the image plane is1where fe (Θ) is the electron scattering factor, r is a postition variable, Θ a scattering angle and x(Θ) the lens transfer function. x(Θ) is given by2w

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3

Yang, Su, An Zhi-yong, Li Qi та Xu Miao. "Optical design of wide-angle large-relative-aperture f-θ lens". Journal of Applied Optics 36, № 3 (2015): 376–80. http://dx.doi.org/10.5768/jao201536.0301007.

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4

Ning, Chen Wei, Cao Jian Zhong, Yang Hong Tao, et al. "Target Optimization Design of Cam Curve in Zoom System." Key Engineering Materials 552 (May 2013): 44–51. http://dx.doi.org/10.4028/www.scientific.net/kem.552.44.

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Zoom lens has been widely applied in all kinds of fields, and its cam optimization is the key to actualizing the performance of its optical design and the zooming process, while the smoothness and speediness of zooming movement must be considered for military and civilian use. With the incremental use of environmental requirements, it puts forward higher requests to the cam performance of lens. In order to guarantee that the cam has good stiffness in the case of vibration and shock environment, in the process of cam design, it not only requires curve optimal, but also needs to consider influen

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5

Yuanyuan, LI, WANG Chunyan та WANG Zhiqiang. "F-θ lens design for high-precision semiconductor laser marking machine". Journal of Applied Optics 41, № 1 (2020): 202–8. http://dx.doi.org/10.5768/jao202041.0107003.

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6

May, Karl Henrik, Shiva Mohammadzadeh, Andreas Keil, Georg von Freymann, and Fabian Friederich. "Coherent Off-Axis Terahertz Tomography with a Multi-Channel Array and f-theta Optics." Sensors 24, no. 2 (2024): 529. http://dx.doi.org/10.3390/s24020529.

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Terahertz tomography is a promising method among non-destructive inspection techniques to detect faults and defects in dielectric samples. Recently, image quality was improved significantly through the incorporation of a priori information and off-axis data. However, this improvement has come at the cost of increased measurement time. To aim toward industrial applications, it is therefore necessary to speed up the measurement by parallelizing the data acquisition employing multi-channel setups. In this work, we present two tomographic frequency-modulated continuous wave (FMCW) systems working

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7

Tien, Chuen-Lin, Chun-Yu Chiang, and Wen-Shing Sun. "Design of a Miniaturized Wide-Angle Fisheye Lens Based on Deep Learning and Optimization Techniques." Micromachines 13, no. 9 (2022): 1409. http://dx.doi.org/10.3390/mi13091409.

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This paper presents the optimization design of a miniaturized five-element wide-angle fisheye lens using a deep learning algorithm. Zemax optical design software was used to simulate and optimize the wide-angle fisheye lens. A deep learning algorithm helped to find the best combination of different lens materials. We first used six lens elements as an initial configuration to design miniaturized wide-angle fisheye lenses using the optimization process. The optical system components were gradually decreased to five lens elements. Both OKP4HT and polymethyl methacrylate (PMMA) plastic aspheric l

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8

Volyar, Alexander, Eugeny Abramochkin, Yana Akimova, and Mikhail Bretsko. "Astigmatic-Invariant Structured Singular Beams." Photonics 9, no. 11 (2022): 842. http://dx.doi.org/10.3390/photonics9110842.

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We investigate the transformation of structured Laguerre–Gaussian (sLG) beams after passing through a cylindrical lens. The resulting beam, ab astigmatic structured Laguerre–Gaussian (asLG) beam, depends on quantum numbers (n,ℓ) and three parameters. Two of them are control parameters of the initial sLG beam, the amplitude ϵ and phase θ. The third one is the ratio of the Rayleigh length z0 and the focal length f of the cylindrical lens. It was theoretically revealed and experimentally confirmed that the asLG beam keeps the intensity shape of the initial sLG beam when the parameters satisfy sim

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9

Wang Chunhui, 王春晖, 季一勤 Ji Yiqin, 高龙 Gao Long, 李彦超 Li Yanchao та 曲杨 Qu Yang. "Optical Design of Large Working Area f-θ Scanning Lens for 2 μm Laser Heterodyne Interferometry System". Chinese Journal of Lasers 38, № 12 (2011): 1216002. http://dx.doi.org/10.3788/cjl201138.1216002.

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10

Pang, Yajun, Kai Zhang, Zhenxu Bai, Youchun Sun, and Meiling Yao. "Design Study of a Large-Angle Optical Scanning System for MEMS LIDAR." Applied Sciences 12, no. 3 (2022): 1283. http://dx.doi.org/10.3390/app12031283.

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MEMS-based LIDAR has the advantages of fast-scanning, simple structure, small volume, and light weight, which make it a hot topic for 3D imaging. In order to overcome the limited scanning angle of the current MEMS mirrors, a large angle MEMS-based optical scanning system was designed using telephoto structure. In this design an f-θ lens group is used for flat field scanning and a symmetrical cemented lens group is used for angle expansion. The principle of this system is discussed in detail and an optical design is implemented by ZEMAX software. The designed system realized a scanning angle as

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11

Zhang, Jialei, Yaoke Xue, Canglong Zhou, Shangmin Lin, and Meiying Liu. "Athermalization of Optical System with Large Field of View for Image Navigation." Journal of Physics: Conference Series 2617, no. 1 (2023): 012007. http://dx.doi.org/10.1088/1742-6596/2617/1/012007.

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Abstract Image navigation sensor is one of the most important sensing means for human to explore the extraterrestrial space environment, and optical system is a key component of image navigation sensor, directly determines the amount of information perceived. The optical system requirements of image navigation sensors are gradually developing towards large field of view and miniaturization. The fisheye lens is the first choice for large field of view imaging by selecting the appropriate optical structure, without adding other additional components, and has the advantages of small size and stro

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12

Chang, Sung Ho, Young Moo Heo, G. H. Shin, Young Min Lee, Jeong Jin Kang, and T. S. Jung. "An Experimental Study on Flow Characteristics of PBK-40 for Glass Molding Press Simulation." Key Engineering Materials 364-366 (December 2007): 476–81. http://dx.doi.org/10.4028/www.scientific.net/kem.364-366.476.

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Remarkable progress had been made in both technology and production of optical elements including aspheric lens. Especially, requirements for machining glass materials have been increasing in terms of limitation on using environment, flexibility of material selection and surface accuracy. In the past, precision optical glass lenses were produced through multiple processes such as grinding and polishing, but mass production of aspheric lenses requiring high accuracy and having complex profile was rather difficult. Against such a background, the high-precision optical GMP process was developed w

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13

Harris, Zachery B., Arjun Virk, Mahmoud E. Khani та M. Hassan Arbab. "Terahertz time-domain spectral imaging using telecentric beam steering and an f-θ scanning lens: distortion compensation and determination of resolution limits". Optics Express 28, № 18 (2020): 26612. http://dx.doi.org/10.1364/oe.398706.

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14

Borges, Carlos R. "LECs, Local Mixers, Topological Groups and Special Products." Journal of the Australian Mathematical Society. Series A. Pure Mathematics and Statistics 44, no. 2 (1988): 252–58. http://dx.doi.org/10.1017/s1446788700029839.

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AbstractWe prove that every (locally) contractible topological group is (L)EC and apply these results to homeomorphism groups, free topological groups, reduced products and symmetric products. Our main results are: The free topological group of a θ-contractible space is equiconnected. A paracompact and weakly locally contractible space is locally equiconnected if and only if it has a local mixer. There exist compact metric contractible spaces X whose reduced (symmetric) products are not retracts of the Graev free topological groups F(X) (A(X)) (thus correcting results we published ibidem).

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15

BOISSONNAT, JEAN-DANIEL, OLIVIER DEVILLERS, LEONBATTISTA DONATI, and FRANCO P. PREPARATA. "MOTION PLANNING OF LEGGED ROBOTS: THE SPIDER ROBOT PROBLEM." International Journal of Computational Geometry & Applications 05, no. 01n02 (1995): 3–20. http://dx.doi.org/10.1142/s0218195995000027.

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We consider the problem of planning motions of a simple legged robot called the spider robot. The robot is modelled as a point where all its legs are attached, and the footholds where the robot can securely place its feet consist of a set of n points in the plane. We show that the space F of admissible and stable placements of such robots has size Θ(n2) and can be constructed in O(n2 log n) time and O(n2) space. Once F has been constructed, we can efficiently solve several problems related to motion planning.

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16

Liu, Meng, and Xuan Zheng. "Improving the Light Extraction Efficiency of GaN-Based Thin-Film Flip-Chip Micro-LEDs through Inclined Sidewall and Photonic Crystals." Electronics 13, no. 18 (2024): 3750. http://dx.doi.org/10.3390/electronics13183750.

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Low light extraction efficiency (LEE) remains a critical bottleneck in the performance of contemporary micro-light-emitting diodes (micro-LEDs). This study presents an innovative approach to improve the LEE of Gallium nitride (GaN)-based thin-film flip-chip (TFFC) micro-LEDs by integrating an inclined sidewall with photonic crystals (PhCs). Three-dimensional finite-difference time-domain (FDTD) simulations reveal that the inclined sidewall design significantly increases the escape probability of light, thereby improving LEE. Additionally, the PhCs’ structure further improves LEE by enabling mo

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17

Larson, D. J., K. F. Russell, and M. K. Miller. "Effect of Specimen Aspect Ratio on the Reconstruction of Atom Probe Tomography Data." Microscopy and Microanalysis 5, S2 (1999): 930–31. http://dx.doi.org/10.1017/s1431927600017979.

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The field ion microscope is a point projection microscope, with the magnification inversely proportional to the radius of curvature (R) of the needle-shaped tip which comprises the specimen. The electric field at the specimen apex, which determines the trajectories of field evaporated ions, is given by F=V/(kR), where V is the specimen voltage and k is a geometric field reduction factor which increases with the specimen taper angle, θ. In the reconstruction of atom probe tomography (APT) data, the magnification, and thus the lateral extent of the analyzed region, is determined primarily by the

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18

Shadle, Christine H. "Alternatives to moments for characterizing fricatives: Reconsidering Forrest et al. (1988)." Journal of the Acoustical Society of America 153, no. 2 (2023): 1412–26. http://dx.doi.org/10.1121/10.0017231.

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Means of characterizing acoustic signals of fricatives with a few parameters have long been sought. When Forrest, Weismer, Milenkovic, and Dougall [(1988) J. Acoust. Soc. Am. 84, 115–123] described their system of treating spectra as probability density functions and computing the first four spectral moments, others quickly adopted their clearly described method, although it did not distinguish /f/ and /θ/. Various problems with their method are described, including the lack of spectral averaging, the necessity of normalizing the amplitude, and correlation between pairs of moments. Even when t

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19

Kuchev, D. N. "Mathematical Model Development of an In-Line Robotic Complex Mechanical System." Vestnik IzhGTU imeni M.T. Kalashnikova 27, no. 1 (2024): 4–13. http://dx.doi.org/10.22213/2413-1172-2024-1-4-13.

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The article considers the problem of pipeline inspection of the Russian Federation, provides brief statistics on failures of various purpose industrial pipelines, presents the causes of accidents, analyzes technical solutions for pipeline timely inspection using in-line robotic devices, proposes a new design of an in-line robotic complex with the possibility of movement along complex geometry sections, a study presents the mathematical description development of an in-line robotic complex mechanical system for the subsequent creation of a motion control system for the device moving inside the

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20

Danel, Zoriana, Joanna Halun, and Pawel Karbowniczek. "Analytical and Numerical Investigation of Star Polymers in Confined Geometries." International Journal of Molecular Sciences 25, no. 17 (2024): 9561. http://dx.doi.org/10.3390/ijms25179561.

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The analysis of the impact of the star polymer topology on depletion interaction potentials, depletion forces, and monomer density profiles is carried out analytically using field theory methods and techniques as well as molecular dynamic simulations. The dimensionless depletion interaction potentials and the dimensionless depletion forces for a dilute solution of ideal star polymers with three and five legs (arms) in a Θ-solvent confined in a slit between two parallel walls with repulsive surfaces and for the case where one of the surfaces is repulsive and the other inert are obtained. Furthe

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21

Kaye, Stephen B., Jamila Surti, and James S. Wolffsohn. "Average paraxial power of a lens and visual acuity." Scientific Reports 13, no. 1 (2023). http://dx.doi.org/10.1038/s41598-023-34010-4.

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AbstractTo provide a solution for average paraxial lens power (ApP) of a lens. Orthogonal and oblique sections through a lens of power $$F$$ F were reduced to a paraxial representation of lens power followed by integration. Visual acuity was measured using lenses of different powers (cylinders of − 1.0 and − 2.0D) and axes, mean spherical equivalent (MSE) of S + C/2, ApP and a toric correction, with the order of correction randomised. A digital screen at 6 m was used on which a Landolt C with crowding bars was displayed for 0.3 s before vanishing. The general equation for a symmetrical lens of

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22

Mohammadzadeh, Shiva, Raphael Hussung, Andreas Keil та ін. "Compact hand-guided 3D scanning terahertz sensor platforms with 3D-printed aspherical telecentric f-θ lens". International Journal of Microwave and Wireless Technologies, 26 квітня 2023, 1–11. http://dx.doi.org/10.1017/s1759078723000259.

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Abstract We report on the development of a handheld three-dimensional (3D) terahertz scanning system with an aspherical telecentric 3D-printed f-θ lens using selective laser sintering. The lens covers a broader scan line of 50 mm with its larger aperture, compared to the 20 mm range in our initial work, which was presented at the European Microwave Week 2021. In order to evaluate the adaptability of the optomechanical components with different sensor units, two different integrated frequency-modulated continuous wave radar modules based on monolithic microwave integrated circuit technology, op

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23

-, Sagar Sars Maithil. "Drive Formula for Sars Length of Wire Hanging Between Two Electric Poles and Some Applications." International Journal For Multidisciplinary Research 6, no. 1 (2024). http://dx.doi.org/10.36948/ijfmr.2024.v06i01.12541.

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Base on sars length of wire hanging between two electric poles makes angles θ & ∝ with horizontal. Drive the formula for sars length of wire makes angles with horizontal θ & ∝ where (θ > ∝). Find the volume, Sars surface area,Total surface area of many kinds of Sars cuboid and Sars cube like as LL-Sars cuboid, UU-Sars cuboid, LU-Sars cuboid, LL-Sars cube, UU-Sars cube, LU-Sars cube . All kind of Sars cuboid and Sars cube used in optics instruments like as Sars lens, Sars mirror. When a ray of light incident on the Sars surface area then it is refracted or reflected depending on the

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24

Xu, Chen, Dongjie Ye, Haizhou Liu, Zexiang Cheng, Hongze Lin та Weitao Song. "Optical design of a freeform f-θ lens for 405nm laser scanning unit". Applied Optics, 21 лютого 2025. https://doi.org/10.1364/ao.551643.

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25

Zhang, Jingwei, Jingpei Hu, Zenghui Yang, Aijun Zeng, and Huijie Huang. "Angle monitor of micromirror array for freeform illumination in lithography systems." AIP Advances 14, no. 1 (2024). http://dx.doi.org/10.1063/5.0186334.

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Source and mask optimization is a critical technique for further resolution enhancement in immersion lithography systems, wherein the optimal illumination source shape is widely generated by the micromirror array. Accordingly, the accurate achievement of the allocated angles of micromirrors is a key prerequisite for the implementation of arbitrary illumination patterns. In this paper, we propose an angle monitor to ensure the high-precision tilting of thousands of biaxial micromirrors. As one of the critical modules for closed-loop control of the two-dimensional micromirror array, the online m

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26

Khani, Mahmoud E., Zachery B. Harris, Omar B. Osman, et al. "Supervised machine learning for automatic classification of in vivo scald and contact burn injuries using the terahertz Portable Handheld Spectral Reflection (PHASR) Scanner." Scientific Reports 12, no. 1 (2022). http://dx.doi.org/10.1038/s41598-022-08940-4.

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AbstractWe present an automatic classification strategy for early and accurate assessment of burn injuries using terahertz (THz) time-domain spectroscopic imaging. Burn injuries of different severity grades, representing superficial partial-thickness (SPT), deep partial-thickness (DPT), and full-thickness (FT) wounds, were created by a standardized porcine scald model. THz spectroscopic imaging was performed using our new fiber-coupled Portable HAndheld Spectral Reflection Scanner, incorporating a telecentric beam steering configuration and an f-$$\theta$$ θ scanning lens. ASynchronous Optical

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27

sprotocols. "Imaging and Analysis of OT1 T Cell Activation on Lipid Bilayers." January 7, 2015. https://doi.org/10.5281/zenodo.13784.

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Authors: Peter Beemiller, Jordan Jacobelli & Matthew Krummel ### Abstract Supported lipid bilayers are frequently used to study cell membrane protein dynamics during immune synapse formation by T cells. Here we describe methods for the imaging and analysis of OT1+ T cell activation and T-cell receptor (TCR) dynamics on lipid bilayers. ### Introduction T cells are activated at immune synapses when TCRs bind agonist ligands on antigen presenting cells (APCs). Glass coverslip–supported lipid bilayers provide a system for in vitro T cell activation and immune synapse formation. In these system

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