Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

A device to eliminate optical imperfections and to improve the quality of images has been developed

06.07.2007
A team of scientists from the Universitat Jaume I (UJI) and the Universidade de Santiago de Compostela (USC) in Spain has created a device that measures and counteracts the imperfections of any optical system and, consequently, allows higher quality images to be obtained.

The invention will enable ophthalmologists to improve the physical examination of their patients’ ocular fundus and to diagnose pathologies affecting the retina more reliably. Furthermore, the device opens the way towards the development of intelligent glasses, capable of being automatically adapted to the user’s visual deficiencies.

The images we see are formed when light reflects on the objects surrounding us, and then penetrates our eyes and hits the retina. But during this process, light passes through different media (the atmosphere, the cornea, the crystalline lens, the vitreous and aqueous humours) that are neither ideal nor homogenous and, for this reason, imperfections appear in the final image.

A parallel situation takes place in other optical systems (telescopes, microscopes, cameras) whose images are also affected by some type of deformation or degradation. The device developed by UJI and USC allows these shortcomings (optical aberrations, in scientific jargon) to be immediately and automatically measured and corrected.

One of the advantages of the new system with regard to those already existing is that it uses commercial liquid crystal screens of the TNLCD (Twisted Nematic Liquid Crystal) kind which reduce the device manufacturing costs. Under adequate polarisation conditions, liquid crystal screens operate with light and enable the modulation of the electromagnetic field amplitude, which is associated with the light that falls on them; this is obtained when a low computer-controlled voltage is applied to each screen pixel.

Another innovating aspect presented by the device that has been developed and patented by UJI and USC is that, for the first time, it integrates the measuring and counteracting of optical aberrations in one single system element (the liquid crystal screen). In this way, the whole invention can not only determine the degree of imperfection of the image that needs to be corrected, but can also apply the necessary voltage to counteract it. And all this is done quickly and automatically.

The researchers are currently seeking a technological company capable of producing and commercialising the invention. The research has been jointly conducted by the Research Group on Optics from the Department of Physics at UJI and by the Research Group on Wave-Front Sensors and Micro-Optics from the Department of Applied Physics at USC, which are respectively directed by Professors Vicent Climent and Salvador X. Bará.

Hugo Cerdà | alfa
Further information:
http://www.uji.es/canals/investigacio/

More articles from Physics and Astronomy:

nachricht Researchers discover link between magnetic field strength and temperature
21.08.2018 | American Institute of Physics

nachricht Smallest transistor worldwide switches current with a single atom in solid electrolyte
17.08.2018 | Karlsruher Institut für Technologie (KIT)

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: It’s All in the Mix: Jülich Researchers are Developing Fast-Charging Solid-State Batteries

There are currently great hopes for solid-state batteries. They contain no liquid parts that could leak or catch fire. For this reason, they do not require cooling and are considered to be much safer, more reliable, and longer lasting than traditional lithium-ion batteries. Jülich scientists have now introduced a new concept that allows currents up to ten times greater during charging and discharging than previously described in the literature. The improvement was achieved by a “clever” choice of materials with a focus on consistently good compatibility. All components were made from phosphate compounds, which are well matched both chemically and mechanically.

The low current is considered one of the biggest hurdles in the development of solid-state batteries. It is the reason why the batteries take a relatively long...

Im Focus: Color effects from transparent 3D-printed nanostructures

New design tool automatically creates nanostructure 3D-print templates for user-given colors
Scientists present work at prestigious SIGGRAPH conference

Most of the objects we see are colored by pigments, but using pigments has disadvantages: such colors can fade, industrial pigments are often toxic, and...

Im Focus: Unraveling the nature of 'whistlers' from space in the lab

A new study sheds light on how ultralow frequency radio waves and plasmas interact

Scientists at the University of California, Los Angeles present new research on a curious cosmic phenomenon known as "whistlers" -- very low frequency packets...

Im Focus: New interactive machine learning tool makes car designs more aerodynamic

Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.

When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...

Im Focus: Robots as 'pump attendants': TU Graz develops robot-controlled rapid charging system for e-vehicles

Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.

Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

LaserForum 2018 deals with 3D production of components

17.08.2018 | Event News

Within reach of the Universe

08.08.2018 | Event News

A journey through the history of microscopy – new exhibition opens at the MDC

27.07.2018 | Event News

 
Latest News

Air pollution leads to cardiovascular diseases

21.08.2018 | Ecology, The Environment and Conservation

Researchers target protein that protects bacteria's DNA 'recipes'

21.08.2018 | Life Sciences

A paper battery powered by bacteria

21.08.2018 | Power and Electrical Engineering

VideoLinks
Science & Research
Overview of more VideoLinks >>>