Measurement of gradient index profile using deflectometry

2013 ◽  
Vol 306 ◽  
pp. 145-149 ◽  
Author(s):  
Md. Asraful Sekh ◽  
Nisha Sood Biswas ◽  
Samir Sarkar ◽  
Amitabha Basuray
Keyword(s):  
Gradient Index ◽  
Index Profile

Single dispersive gradient-index profile for the aging human lens

2007 ◽  
Vol 25 (1) ◽  
pp. 250 ◽  
Author(s):  
José Antonio Díaz ◽  
Carles Pizarro ◽  
Josep Arasa
Keyword(s):  
Human Lens ◽  
Gradient Index ◽  
Index Profile

An alternative method for measuring the index profile of a gradient-index lens

2011 ◽  
Author(s):  
H. C. Hsieh ◽  
W. C. Wu ◽  
W. Y. Chang ◽  
F. S. Hsu ◽  
D. C. Su
Keyword(s):  
Gradient Index ◽  
Index Profile ◽  
Alternative Method ◽  
Gradient Index Lens

Role of the human lens gradient-index profile in the compensation of third-order ocular aberrations

2012 ◽  
Vol 17 (7) ◽  
pp. 0750031 ◽  
Author(s):  
José A. Díaz ◽  
José Fernández-Dorado ◽  
Francisco Sorroche
Keyword(s):  
Human Lens ◽  
Gradient Index ◽  
Index Profile ◽  
Third Order ◽  
Ocular Aberrations

scholarly journals Age-dependent variation of the gradient index profile in human crystalline lenses

2011 ◽  
Vol 58 (19-20) ◽  
pp. 1781-1787 ◽  
Author(s):  
Alberto de Castro ◽  
Damian Siedlecki ◽  
David Borja ◽  
Stephen Uhlhorn ◽  
Jean-Marie Parel ◽  
...  
Keyword(s):  
Gradient Index ◽  
Index Profile ◽  
Age Dependent

Gradient-index profile control by field-assisted ion exchange in glass

1985 ◽  
Vol 24 (24) ◽  
pp. 4326 ◽  
Author(s):  
Susan N. Houde-Walter ◽  
Duncan T. Moore
Keyword(s):  
Ion Exchange ◽  
Gradient Index ◽  
Index Profile ◽  
Profile Control

scholarly journals Passive discrete lens for broadband elastic guided wave focusing

2021 ◽  
Author(s):  
Emeline Sadoulet-Reboul ◽  
Gaël Matten ◽  
Kaijun Yi ◽  
Morvan Ouisse
Keyword(s):  
Refractive Index ◽  
Elastic Wave ◽  
Health Monitoring ◽  
Focal Point ◽  
Refractive Index Profile ◽  
Guided Wave ◽  
Gradient Index ◽  
Frequency Range ◽  
Index Profile ◽  
Wave Focusing

Elastic guided wave focusing is of great interest for applications such as vibroacoustic control, energy harvesting, or Structural Health Monitoring. Different strategies allow generation of this effect, GRadient-INdex devices in particular exploit medium with varying properties such as thickness to reproduce an adequate refractive index profile as in optics. The resulting continuous profiles have a curved geometry that can be hard to manufacture, and be difficult to integrate in a given design. The purpose of this paper is to propose a discrete design for a GRIN lens. It is composed of segments selected in number and thickness to give similar focusing effects as a continuous lens profile. The identified configuration is manufactured and bounded on an aluminium plate to evaluate the effective focusing performances. Numerical and experimental vibrometry results confirm that the proposed lens exhibits a fixed focal point over a broad frequency range. The discrete design overcomes fabrication issues encountered in continuous design, allowing for an easier integration in devices for elastic wave control.

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