scholarly journals Three-dimensional illumination system using dielectric liquid lenses

2011 ◽  
Vol 19 (S4) ◽  
pp. A740 ◽  
Author(s):  
Yen-Sheng Lu ◽  
Ling-Yu Tsai ◽  
Kuo-Cheng Huang ◽  
C. Gary Tsai ◽  
Chih-Cheng Yang ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Dielectric Liquid ◽  
Liquid Lenses ◽  
Illumination System

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.

scholarly journals Temperature effects on dielectric liquid lenses

2014 ◽  
Vol 22 (2) ◽  
pp. 1930 ◽  
Author(s):  
Hongxia Zhang ◽  
Hongwen Ren ◽  
Su Xu ◽  
Shin-Tson Wu
Keyword(s):  
Temperature Effects ◽  
Dielectric Liquid ◽  
Liquid Lenses

Calibration of a three-dimensional photodynamic therapy illumination system and its segmentation assessment for port-wine stains

2016 ◽  
Vol 5 (3) ◽  
Author(s):  
Yun Feng ◽  
Xiaoming Hu ◽  
Ya Zhou ◽  
Yong Wang
Keyword(s):  
Photodynamic Therapy ◽  
Three Dimensional ◽  
Calibration Method ◽  
Field Of View ◽  
Utilization Rate ◽  
Color Coding ◽  
Light Dosimetry ◽  
Illumination System ◽  
Low Field ◽  
Fine Distinction

AbstractThe uniformity of light dosimetry is an important parameter that affects the efficacy of photodynamic therapy (PDT). Although this uniformity can be improved by a three-dimensional (3D) digital PDT illumination system, it has a low field-of-view (FOV) utilization rate. A checkerboard calibration method using color coding is proposed to calibrate both the projector and camera of the system with a broad common FOV. Experiments reveal that the proposed method increases the utilization rate by up to three times compared with noncolor-coding methods with almost the same accuracy. A fine distinction of phantom lesions in the 3D system can be obtained by clustering, which may be used to optimize the treatment and light-dosimetry evaluation.

Electrically tunable lenses – eliminating mechanical axial movements during high-speed 3D live imaging

2021 ◽  
Vol 134 (16) ◽  
Author(s):  
Christoforos Efstathiou ◽  
Viji M. Draviam
Keyword(s):  
Cell Biology ◽  
High Speed ◽  
Imaging Techniques ◽  
Three Dimensional ◽  
Cost Effective ◽  
High Speed Imaging ◽  
Liquid Lenses ◽  
Live Cell Microscopy ◽  
Tunable Lenses ◽  
Cell Microscopy

ABSTRACT The successful investigation of photosensitive and dynamic biological events, such as those in a proliferating tissue or a dividing cell, requires non-intervening high-speed imaging techniques. Electrically tunable lenses (ETLs) are liquid lenses possessing shape-changing capabilities that enable rapid axial shifts of the focal plane, in turn achieving acquisition speeds within the millisecond regime. These human-eye-inspired liquid lenses can enable fast focusing and have been applied in a variety of cell biology studies. Here, we review the history, opportunities and challenges underpinning the use of cost-effective high-speed ETLs. Although other, more expensive solutions for three-dimensional imaging in the millisecond regime are available, ETLs continue to be a powerful, yet inexpensive, contender for live-cell microscopy.

Interferograms of dielectric liquid lenses

2012 ◽  
Author(s):  
Y. Kevin Chang ◽  
Kuo Cheng Huang ◽  
En Hao Chang ◽  
J. Andrew Yeh
Keyword(s):  
Dielectric Liquid ◽  
Liquid Lenses

Planar Liquid Confinement for Optical Centering of Dielectric Liquid Lenses

2009 ◽  
Vol 21 (19) ◽  
pp. 1396-1398 ◽  
Author(s):  
C.G. Tsai ◽  
Chi-Nan Chen ◽  
Li-Shun Cheng ◽  
Chih-Cheng Cheng ◽  
Jing-Tang Yang ◽  
...  
Keyword(s):  
Dielectric Liquid ◽  
Liquid Lenses

scholarly journals Control of prehension for the transradial prosthesis: Natural-like image recognition system

2009 ◽  
Vol 19 (1) ◽  
pp. 27-31 ◽  
Author(s):  
Djordje Klisic ◽  
Milos Kostic ◽  
Strahinja Dosen ◽  
Dejan Popovic
Keyword(s):  
Degrees Of Freedom ◽  
Three Dimensional ◽  
Recognition System ◽  
Hand Orientation ◽  
Healthy Humans ◽  
Illumination System ◽  
Time Estimates ◽  
Object Based ◽  
Web Camera ◽  
Shape And Size

We describe the hardware and software for the control of prehension for a dexterous transradial prosthesis. The prehension process comprises hand orientation (three degrees of freedom) and the opening of the hand in a manner that is appropriate for the shape and size of the object. The hardware consists of a standard web camera, accelerometer, ultrasound distance sensor, laser pointer and an LED illumination system. Software operating in real time estimates the shape and size of the object as well as the relative orientation of the hand with respect to the object. Based on this data, the controller generates signals that are sent to the three-dimensional (3D) wrist rotator, and drives which control fingers and thumb of the transradial prosthesis, thereby preparing the hand for palmar, lateral, or precision (2-digit or 3-digit) grasps. The choice of the grasp follows heuristics captured from healthy humans when grasping and expressed in the form of IF-THEN rules.

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