scholarly journals Lorentz Force Actuated Tunable-Focus Liquid Lens

Micromachines ◽  
2019 ◽  
Vol 10 (10) ◽  
pp. 714
Author(s):  
Kari L. Van Grinsven ◽  
Alireza Ousati Ashtiani ◽  
Hongrui Jiang
Keyword(s):  
Lorentz Force ◽  
Large Range ◽  
Focal Length ◽  
Optical Systems ◽  
Wavefront Sensor ◽  
Physical Movement ◽  
Liquid Lenses ◽  
Liquid Lens ◽  
Magnetically Actuated

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.

scholarly journals Flexible Electrowetting-on-Dielectric Microlens Array Sheet

Micromachines ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 464 ◽  
Author(s):  
Kari L. Van Grinsven ◽  
Alireza Ousati Ashtiani ◽  
Hongrui Jiang
Keyword(s):  
Optical System ◽  
Cylindrical Surface ◽  
Microlens Array ◽  
Field Of View ◽  
Wavefront Sensor ◽  
Pdms Substrate ◽  
Lens Array ◽  
Electrowetting On Dielectric ◽  
Liquid Lenses ◽  
Liquid Lens

We have fabricated a fully-flexible, focus-tunable microlens array on a sheet and demonstrated its imaging capabilities. Each liquid lens of the array is individually tunable via electrowetting on dielectric (EWOD) actuation and is situated on a polydimethylsiloxane (PDMS) substrate, which allows the lens array to operate as a reconfigurable optical system. In particular, we observed a significant increase in the field of view (FOV) of the system to 40.4° by wrapping it on a cylindrical surface as compared to the FOV of 21.5° obtained by the array on a planer surface. We also characterized the liquid lenses of the system, observing a range of focus length from 20.2 mm to 9.2 mm as increased voltage was applied to each EWOD lens. A Shack–Hartmann wavefront sensor (SHWS) was used to measure the wavefront of the lens as it was actuated, and the aberrations of the lens were assessed by reporting the Zernike coefficients of the wavefronts.

Universal method for determining the focal length of optical systems by moire deflectometry

1988 ◽  
Vol 27 (8) ◽  
pp. 1383 ◽  
Author(s):  
Eliezer Keren ◽  
Kathi M. Kreske ◽  
Oded Kafri
Keyword(s):  
Focal Length ◽  
Optical Systems ◽  
Universal Method ◽  
Moiré Deflectometry

scholarly journals Tunable-Focus Liquid Lens through Charge Injection

Micromachines ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 109 ◽  
Author(s):  
Shizhi Qian ◽  
Wenxiang Shi ◽  
Huai Zheng ◽  
Zhaohui Liu
Keyword(s):  
Corona Discharge ◽  
Charge Injection ◽  
Dielectric Liquid ◽  
Liquid Lenses ◽  
Liquid Lens ◽  
3D Printed ◽  
Tube Structure

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.

Liquid Lens Module with Wide Field-of-View and Variable Focal Length

2010 ◽  
Vol 6 (4) ◽  
pp. 141-144 ◽  
Author(s):  
Sang Won Seo ◽  
Seungoh Han ◽  
Jun Ho Seo ◽  
Woo Bum Choi ◽  
Man Young Sung
Keyword(s):  
Focal Length ◽  
Field Of View ◽  
Wide Field ◽  
Liquid Lens ◽  
Wide Field Of View

The analysis on the optical power of focal length tunable liquid lens

2015 ◽  
Author(s):  
Chenguang Zhang ◽  
Yiquan Liu ◽  
Jianguo Xin
Keyword(s):  
Focal Length ◽  
Optical Power ◽  
Liquid Lens

Comparison of Design and Spatial Stability of Two Kinds of Optical Systems for Stereoscopic Mapping Camera

2013 ◽  
Vol 760-762 ◽  
pp. 368-372
Author(s):  
Tian Jin Tang ◽  
Wei Jun Gao
Keyword(s):  
Optical System ◽  
Linear Array ◽  
Focal Length ◽  
Optical Systems ◽  
Modulation Transfer ◽  
Working Temperature ◽  
Edge Field ◽  
Performance Requirements ◽  
And Performance ◽  
Structure Layout

To achieve a certain precision when mapping in accord with a particular proportion or scale with stereo mapping camera, the change of chief ray height of the edge field due to the fluctuation of working temperature is required to be within the range of microns, and at the meantime the size and structure layout of three-linear array stereo mapping camera are determined directly by the configuration of optical system. Based on the requirements of refractive optical system with long focal length, academic calculation and actual optical designs based on two typical configurations for stereoscopic mapping camera are made,the actual working temperature and performance requirements are also taken into consideration, the results including the modulation transfer function, distortion and stability comparison are also given.

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