A Depth From Defocus Measurement System Using a Liquid Lens Objective for Extended Depth Range

2017 ◽  
Vol 66 (3) ◽  
pp. 441-450 ◽  
Author(s):  
Simone Pasinetti ◽  
Ileana Bodini ◽  
Matteo Lancini ◽  
Franco Docchio ◽  
Giovanna Sansoni
Keyword(s):  
Measurement System ◽  
Depth Range ◽  
Liquid Lens ◽  
Depth From Defocus

Automatic selection of focal lengths in a Depth From Defocus measurement system based on liquid lenses

2017 ◽  
Vol 96 ◽  
pp. 68-74 ◽  
Author(s):  
Simone Pasinetti ◽  
Ileana Bodini ◽  
Matteo Lancini ◽  
Franco Docchio ◽  
Giovanna Sansoni
Keyword(s):  
Measurement System ◽  
Liquid Lenses ◽  
Automatic Selection ◽  
Depth From Defocus ◽  
Selection Of

scholarly journals Large Depth-of-Field Integral Microscopy by Use of a Liquid Lens

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3383 ◽  
Author(s):  
Anabel Llavador ◽  
Gabriele Scrofani ◽  
Genaro Saavedra ◽  
Manuel Martinez-Corral
Keyword(s):  
Numerical Aperture ◽  
Optical Power ◽  
Axial Position ◽  
Depth Of Field ◽  
Depth Range ◽  
Liquid Lens ◽  
New Apparatus ◽  
Depth Ranges ◽  
Limited Depth ◽  
At Will

Integral microscopy is a 3D imaging technique that permits the recording of spatial and angular information of microscopic samples. From this information it is possible to calculate a collection of orthographic views with full parallax and to refocus computationally, at will, through the 3D specimen. An important drawback of integral microscopy, especially when dealing with thick samples, is the limited depth of field (DOF) of the perspective views. This imposes a significant limitation on the depth range of computationally refocused images. To overcome this problem, we propose here a new method that is based on the insertion, at the pupil plane of the microscope objective, of an electrically controlled liquid lens (LL) whose optical power can be changed by simply tuning the voltage. This new apparatus has the advantage of controlling the axial position of the objective focal plane while keeping constant the essential parameters of the integral microscope, that is, the magnification, the numerical aperture and the amount of parallax. Thus, given a 3D sample, the new microscope can provide a stack of integral images with complementary depth ranges. The fusion of the set of refocused images permits to enlarge the reconstruction range, obtaining images in focus over the whole region.

CCD flux measurement system PROHERMES

1999 ◽  
Vol 09 (PR3) ◽  
pp. Pr3-649-Pr3-654 ◽  
Author(s):  
A. Kröger-Vodde ◽  
A. Holländer
Keyword(s):  
Measurement System ◽  
Flux Measurement
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