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Journal articles on the topic 'Focus of a lens'

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Published: 4 June 2021
Last updated: 1 February 2022

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1

Scherger, Benedikt, Christian Jördens, and Martin Koch. "Variable-focus terahertz lens." Optics Express 19, no. 5 (February 23, 2011): 4528. http://dx.doi.org/10.1364/oe.19.004528.

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2

Brock-Fisher, George A. "Multi-focus ultrasound lens." Journal of the Acoustical Society of America 104, no. 5 (November 1998): 2553. http://dx.doi.org/10.1121/1.423829.

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3

Ren, Hongwen, and Shin-Tson Wu. "Variable-focus liquid lens." Optics Express 15, no. 10 (April 30, 2007): 5931. http://dx.doi.org/10.1364/oe.15.005931.

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4

Moneta, Gregory L. "Wider Lens, Sharper Focus." Journal of the American College of Cardiology 78, no. 4 (July 2021): 327–29. http://dx.doi.org/10.1016/j.jacc.2021.05.023.

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5

Liu, Yunpeng, Bo Yang, Pengxiang Gu, Xingqi Wang, and Hui Zong. "50X five-group inner-focus zoom lens design with focus tunable lens using Gaussian brackets and lens modules." Optics Express 28, no. 20 (September 15, 2020): 29098. http://dx.doi.org/10.1364/oe.404098.

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6

Moseley, Paul, Giorgio Savini, Jin Zhang, and Peter Ade. "Dual focus polarisation splitting lens." Optics Express 25, no. 21 (October 5, 2017): 25363. http://dx.doi.org/10.1364/oe.25.025363.

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7

Ghazian, Osameh, and Jayshri Sabarinathan. "Variable-focus liquid lens simulation." International Journal of Engineering Systems Modelling and Simulation 7, no. 2 (2015): 125. http://dx.doi.org/10.1504/ijesms.2015.068646.

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8

Smither, R. K. "Variable focus crystal diffraction lens." Review of Scientific Instruments 60, no. 7 (July 1989): 2044–47. http://dx.doi.org/10.1063/1.1140872.

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9

Peng, Runling, Yifan Li, Shuilan Hu, Maowei Wei, and Jiabi Chen. "Intraocular lens based on double-liquid variable-focus lens." Applied Optics 53, no. 2 (January 9, 2014): 249. http://dx.doi.org/10.1364/ao.53.000249.

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10

Wang Dazhen, 王大振, 彭润玲 Peng Runling, 陈家璧 Chen Jiabi, and 庄松林 Zhuang Songlin. "Variable-Focus Hysteresis of Double-Liquid Variable-Focus Lens." Acta Optica Sinica 31, no. 6 (2011): 0612001. http://dx.doi.org/10.3788/aos201131.0612001.

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11

Chapman, Steve. "Simplification and Variation in TEM Focus Techniques." Microscopy Today 16, no. 2 (March 2008): 14–17. http://dx.doi.org/10.1017/s1551929500055863.

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In order to understand the focusing action of a TEM objective lens, a simple imaging system (figure 1) is best considered. This system consists of an objective lens and a single projector. In operation, the projector is adjusted as required within the total imaging system to achieve a magnification, M2, on the screen. This results in a focal length of F1, with the lens seeking to find an image in the position M1. If the objective lens does not place the image at M1 the result on the screen is an out of focus condition. The objective lens may have produced an image short of M1, overfocus, or beyond M1, underfocus.
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12

Zhang Zhenzhou, 张振洲, 张庭成 Zhang Tingcheng, 宗肖颖 Zong Xiaoying, and 廖志波 Liao Zhibo. "Design of Rear-Focus Zoom Lens." Laser & Optoelectronics Progress 50, no. 12 (2013): 122201. http://dx.doi.org/10.3788/lop50.122201.

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13

Cheng, Chih-Cheng, C. Alex Chang, and J. Andrew Yeh. "Variable focus dielectric liquid droplet lens." Optics Express 14, no. 9 (May 1, 2006): 4101. http://dx.doi.org/10.1364/oe.14.004101.

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14

Ren, Hongwen, Yun-Hsing Fan, Sebastian Gauza, and Shin-Tson Wu. "Tunable-Focus Cylindrical Liquid Crystal Lens." Japanese Journal of Applied Physics 43, no. 2 (February 10, 2004): 652–53. http://dx.doi.org/10.1143/jjap.43.652.

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15

Sato, Susumu, Akira Sugiyama, and Rumiko Sato. "Variable-Focus Liquid-Crystal Fresnel Lens." Japanese Journal of Applied Physics 24, Part 2, No. 8 (August 20, 1985): L626—L628. http://dx.doi.org/10.1143/jjap.24.l626.

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16

Li, Jiu-Sheng. "Tunable focus graphene-based terahertz lens." Optics Communications 359 (January 2016): 268–71. http://dx.doi.org/10.1016/j.optcom.2015.09.105.

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17

SUEHIRO, S., H. MIYAJI, and H. HAYASHI. "Refractive lens for X-ray focus." Nature 352, no. 6334 (August 1991): 385–86. http://dx.doi.org/10.1038/352385c0.

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18

Sugiura, Norio, and Shinzo Morita. "Variable-focus liquid-filled optical lens." Applied Optics 32, no. 22 (August 1, 1993): 4181. http://dx.doi.org/10.1364/ao.32.004181.

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19

Bard, Rachel. "Focus on Healthcare: A Wider Lens." HealthcarePapers 9, no. 4 (October 15, 2009): 29–31. http://dx.doi.org/10.12927/hcpap.2009.21081.

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20

Wang, Jin-Hui, Wei-Pu Tang, Lin-Yang Li, Liang Xiao, Xin Zhou, and Qiong-Hua Wang. "Hybrid driving variable-focus optofluidic lens." Optics Express 27, no. 24 (November 15, 2019): 35203. http://dx.doi.org/10.1364/oe.27.035203.

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21

CALDWELL, J. BRIAN. "Wide-angle Soft Focus Photographic Lens." Optics and Photonics News 10, no. 1 (January 1, 1999): 49. http://dx.doi.org/10.1364/opn.10.1.000049.

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22

Hasan, Nazmul, Aishwaryadev Banerjee, Hanseup Kim, and Carlos H. Mastrangelo. "Tunable-focus lens for adaptive eyeglasses." Optics Express 25, no. 2 (January 17, 2017): 1221. http://dx.doi.org/10.1364/oe.25.001221.

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23

Zhang, Xingyu, Chunying Guan, Keda Wang, Lin Cheng, Jing Yang, Jinhui Shi, Hongchao Liu, Zhihai Liu, and Libo Yuan. "Multi-focus optical fiber lens based on all-dielectric metasurface." Chinese Optics Letters 19, no. 5 (2021): 050601. http://dx.doi.org/10.3788/col202119.050601.

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24

Van Grinsven, Kari L., Alireza Ousati Ashtiani, and Hongrui Jiang. "Lorentz Force Actuated Tunable-Focus Liquid Lens." Micromachines 10, no. 10 (October 22, 2019): 714. http://dx.doi.org/10.3390/mi10100714.

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Tunable-focus liquid lenses provide focal length tuning for optical systems, e.g., cameras, where physical movement of rigid lenses are not an option or not preferable. In this work we present a magnetically actuated liquid lens utilizing the Lorentz force to vary the focal length as the current through the system is varied. The resulting lens can operate as both a diverging and a converging lens depending on the direction of current applied and has a large range of focal lengths, from −305 mm to –111 mm and from 272 mm to 146 mm. We also characterized the aberrations of the lens during the actuation with a Shack–Hartmann wavefront sensor, and utilized the lens for imaging, during which we measured a resolution of 7.13 lp/mm.
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25

Řezníček, Jan. "Measuring Repeatability of the Focus-variable Lenses." Geoinformatics FCE CTU 13 (December 21, 2014): 9–18. http://dx.doi.org/10.14311/gi.13.1.

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In the field of photogrammetry, the optical system, usually represented by the glass lens, is used for metric purposes. Therefore, the aberration characteristics of such a lens, inducing deviations from projective imaging, has to be well known. However, the most important property of the metric lens is the stability of its glass and mechanical elements, ensuring long-term reliability of the measured parameters. In case of a focus-variable lens, the repeatability of the lens setup is important as well. Lenses with a fixed focal length are usually considered as “fixed” though, in fact, most of them contain one or more movable glass elements, providing the focusing function. In cases where the lens is not equipped with fixing screws, the repeatability of the calibration parameters should be known. This paper derives simple mathematical formulas that can be used for measuring the repeatability of the focus-variable lenses, and gives a demonstrative example of such measuring. The given procedure has the advantage that only demanded parameters are estimated, hence, no unwanted correlations with the additional parameters exist. The test arrangement enables us to measure each demanded magnification of the optical system, which is important in close-range photogrammetry.
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26

Rose, Christie, and William Edmondson. "REFITTING MULTIFOCAL CONTACT LENS PATIENTS INTO THE FOCUS DAILIES PROGRESSIVES LENS." Optometry and Vision Science 78, SUPPLEMENT (December 2001): 49. http://dx.doi.org/10.1097/00006324-200112001-00046.

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27

Qian, Shizhi, Wenxiang Shi, Huai Zheng, and Zhaohui Liu. "Tunable-Focus Liquid Lens through Charge Injection." Micromachines 11, no. 1 (January 20, 2020): 109. http://dx.doi.org/10.3390/mi11010109.

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Liquid lenses are the simplest and cheapest optical lenses, and various studies have been conducted to develop tunable-focus liquid lenses. In this study, a simple and easily implemented method for achieving tunable-focus liquid lenses was proposed and experimentally validated. In this method, charges induced by a corona discharge in the air were injected into dielectric liquid, resulting in “electropressure” at the interface between the air and the liquid. Through a 3D-printed U-tube structure, a tunable-focus liquid lens was fabricated and tested. Depending on the voltage, the focus of the liquid lens can be adjusted in large ranges (−∞ to −9 mm and 13.11 mm to ∞). The results will inspire various new liquid-lens applications.
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28

Wang, Yu, Wei Wang, Xu Zhou, and Fu Long Zhai. "The Research of a Variable-Focus Ultrasonic Liquid Lens." Applied Mechanics and Materials 598 (July 2014): 371–74. http://dx.doi.org/10.4028/www.scientific.net/amm.598.371.

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In this paper, a variable-focus ultrasonic liquid lens controlled by the external voltage is demonstrated. That is, the liquid lens can be reshaped with the external voltage, which will cause the focal length to change. The relationship between liquid lens’ shape and the control voltage was obtained. The influence factors of the response time were researched. And the distribution of the ultrasonic field after the lens under different external control voltages was simulated.
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29

Koyama, Daisuke, Ryoichi Isago, and Kentaro Nakamura. "High-Speed Focus Scanning by an Acoustic Variable-Focus Liquid Lens." Japanese Journal of Applied Physics 50, no. 7S (July 1, 2011): 07HE26. http://dx.doi.org/10.7567/jjap.50.07he26.

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30

Koyama, Daisuke, Ryoichi Isago, and Kentaro Nakamura. "High-Speed Focus Scanning by an Acoustic Variable-Focus Liquid Lens." Japanese Journal of Applied Physics 50, no. 7 (July 20, 2011): 07HE26. http://dx.doi.org/10.1143/jjap.50.07he26.

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31

Xiaochan, Liu, Chen chen, Li Weishan, Liu Hongjun, and Zhangyu. "Design of universal short-focus projection lens." Journal of Applied Optics 37, no. 6 (2016): 607–11. http://dx.doi.org/10.5768/jao201637.0605001.

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32

Crick, Malcolm, and James L. Peacock. "The Anthropological Lens: Harsh Light, Soft Focus." Man 23, no. 4 (December 1988): 774. http://dx.doi.org/10.2307/2802620.

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33

ZHAO Rui, 赵瑞, 华晓刚 HUA Xiao-gang, 田志强 TIAN Zhi-qiang, 刘启超 LIU Qi-chao, 王评 WANG Ping, and 梁忠诚 LIANG Zhong-cheng. "Electrowetting-based variable-focus double-liquid lens." Optics and Precision Engineering 22, no. 10 (2014): 2592–97. http://dx.doi.org/10.3788/ope.20142210.2592.

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34

Son, T. V., C. O. F. Ba, R. Vallée, and A. Haché. "Nanometer-thick flat lens with adjustable focus." Applied Physics Letters 105, no. 23 (December 8, 2014): 231120. http://dx.doi.org/10.1063/1.4903887.

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35

Li, Lei, Jin-Hui Wang, Qiong-Hua Wang, and Shin-Tson Wu. "Displaceable and focus-tunable electrowetting optofluidic lens." Optics Express 26, no. 20 (September 19, 2018): 25839. http://dx.doi.org/10.1364/oe.26.025839.

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36

Ren, Hongwen, and Shin-Tson Wu. "Variable-focus liquid lens by changing aperture." Applied Physics Letters 86, no. 21 (May 23, 2005): 211107. http://dx.doi.org/10.1063/1.1935749.

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37

Oku, Hiromasa, Koichi Hashimoto, and Masatoshi Ishikawa. "Variable-focus lens with 1-kHz bandwidth." Optics Express 12, no. 10 (2004): 2138. http://dx.doi.org/10.1364/opex.12.002138.

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38

Valley, Pouria, David L. Mathine, Mohammad Reza Dodge, Jim Schwiegerling, Gholam Peyman, and N. Peyghambarian. "Tunable-focus flat liquid-crystal diffractive lens." Optics Letters 35, no. 3 (January 26, 2010): 336. http://dx.doi.org/10.1364/ol.35.000336.

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39

JIA Shu-hai, 贾书海, 唐振华 TANG Zhen-hua, 董君 DONG Jun, and 陈花玲 CHEN Hua-ling. "Recent advances in flexible variable-focus lens." Chinese Optics 8, no. 4 (2015): 535–47. http://dx.doi.org/10.3788/co.20150804.0535.

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40

HOLLINGSWORTH, DAVID KEITH, WALTER CAL JOHNSON, and STEPHEN W. COOK. "Beatrice A. Wright: Broad Lens, Sharp Focus." Journal of Counseling & Development 67, no. 7 (March 1989): 384–93. http://dx.doi.org/10.1002/j.1556-6676.1989.tb02098.x.

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41

Preskill, Hallie. "The cultural lens: Bringing utilization into focus." New Directions for Program Evaluation 1991, no. 49 (1991): 5–15. http://dx.doi.org/10.1002/ev.1567.

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42

Ren, Hongwen, Yun-Hsing Fan, Sebastian Gauza, and Shin-Tson Wu. "Tunable-focus flat liquid crystal spherical lens." Applied Physics Letters 84, no. 23 (June 7, 2004): 4789–91. http://dx.doi.org/10.1063/1.1760226.

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43

Brody, Eugene B. "The Anthropological Lens: Harsh Light, Soft Focus." Journal of Nervous and Mental Disease 176, no. 8 (August 1988): 514. http://dx.doi.org/10.1097/00005053-198808000-00012.

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44

Kang, Ming, and Ruifeng Yue. "Variable-Focus Liquid Lens Based on EWOD." Journal of Adhesion Science and Technology 26, no. 12-17 (May 17, 2012): 1941–46. http://dx.doi.org/10.1163/156856111x600479.

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45

Kuiper, S., and B. H. W. Hendriks. "Variable-focus liquid lens for miniature cameras." Applied Physics Letters 85, no. 7 (August 16, 2004): 1128–30. http://dx.doi.org/10.1063/1.1779954.

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46

McKillip, John L. "Objective Lens." Fine Focus 4, no. 1 (March 29, 2018): 9–11. http://dx.doi.org/10.33043/ff.4.1.9-11.

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47

Sudhir, Rachapalle Reddi, Arindam Dey, Shovan Bhattacharrya, and Amit Bahulayan. "AcrySof IQ PanOptix Intraocular Lens Versus Extended Depth of Focus Intraocular Lens and Trifocal Intraocular Lens." Asia-Pacific Journal of Ophthalmology 8, no. 4 (July 2019): 335–49. http://dx.doi.org/10.1097/apo.0000000000000253.

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48

Wang, Lihui, and Masatoshi Ishikawa. "Dynamic Response of Elastomer-Based Liquid-Filled Variable Focus Lens." Sensors 19, no. 21 (October 24, 2019): 4624. http://dx.doi.org/10.3390/s19214624.

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Variable focus lenses are capable of dynamically varying their focal lengths. The focal length is varied by adjusting the curvature of the refractive surface and the media on both sides of the lens. The dynamic response is one of the most important criteria to determine the performance of variable focus lens. In this work, we investigated critical factors that affect the dynamic response of liquid-filled variable focus lens with a large aperture size. Based on a theoretical analysis of a circular disk representative of a deformable surface, we found that the dynamic response is significantly influenced by the diameter, thickness, and stiffness of the disk because these factors determine its first natural frequency. We also studied the dynamic response of elastomer-based liquid-filled variable focus lens prototype with different aperture sizes (20 and 30 mm) by using experiments and we found that the lens with the smaller aperture size had an excellent dynamic response.
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49

Paternò, Gianfranco, Michele Marziani, Riccardo Camattari, Valerio Bellucci, Andrea Mazzolari, Mauro Gambaccini, and Vincenzo Guidi. "Laue lens to focus an X-ray beam for radiation therapy." Journal of Applied Crystallography 49, no. 2 (February 24, 2016): 468–78. http://dx.doi.org/10.1107/s1600576716000716.

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A Laue lens is an optical component composed of a set of crystals that produce a convergent beam exploiting X-ray diffraction in transmission geometry. Employment of a system formed by a properly designed Laue lens coupled with an X-ray unit to selectively irradiate tumours is proposed. A convergent beam leads to a depth dose profile with a pronounced peak at the focal depth, which may result in a high precision of the dose delivery. Using a custom-made Monte Carlo code and the GAMOS code, we carried out a design study to determine the geometry and the optimal features of the crystals composing the lens. As an application, a Laue lens capable of focusing a 80 keV beam 50 cm downstream of the lens has been designed. The lens is composed of an ensemble of Si crystals with curved diffracting planes. The lens produces a focal spot of 2 mm enclosing 7.64 × 106 photons for an electron charge of 1 mC impinging on the surface of the X-ray tube anode. The combination of these important figures of merit makes the proposed system suitable for irradiating both sub-cm and larger tumour masses efficiently. A dose of 2 Gy can be delivered to a small tumour in a few seconds, sparing at the same time the surrounding tissues.
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50

Xu, Miao, Xiahui Wang, and Hongwen Ren. "Tunable Focus Liquid Lens with Radial-Patterned Electrode." Micromachines 6, no. 8 (August 17, 2015): 1157–65. http://dx.doi.org/10.3390/mi6081157.

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