Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Scientists reduced the weight of optics for satellite observation by 100 times

08.08.2018

The work of Samara University scientists is published in IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing (IEEE) published the article of the group of scientists of Samara National Research University. It describes the work on the creation and use of ultralight diffraction optics for obtaining high-resolution images.


Scientists of Samara University Reduced the Weight of Optics for Satellite Observation of the Earth by 100 Times (Video)

Credit: Samara University

In this paper, the technology of manufacturing of a 256-layer diffraction harmonic lens and the algorithms for reconstructing the obtained images are described. This optical element, created by the research group of the Department of Supercomputers and General Informatics of Samara University, weighs only 5 grams and replaces a complex and massive system of lenses and mirrors similar to the one that is used in telephoto lenses with a focal length of 300 mm and a weight of 500 grams. "To solve the problems in the areas where there is a constant struggle for the reduction of the weight and size of the optics, such massive systems are not suitable. First of all, it concerns compact systems of Earth remote sensing set on small-sized aircrafts, i.e. UAVs, atmospheric probes and nanosatellites. Ultralight diffraction-optical systems weighing only a few grams open up new possibilities for them", - says one of the authors of the scientific article, Professor of the Department of Supercomputers and General Informatics Artem Nikonorov.

Modern heavy photo and telephoto lenses need a large number of optical elements (12 and more) for the compensation of image distortions that take place due to optical aberrations. The scientists, when using an ultralight harmonic lens, proposed to compensate for such distortions with the use of digital processing. The computational reconstruction developed by them for these purposes includes colour correction of the image and elimination of chromatic blurring using convolutional neural networks (CNN). The results of the testings conducted by the developers showed that the quality of images restored in this way is comparable to the quality of images obtained from consumer cameras and mobile phones.

The time for reconstruction of one image based on the CNN is about 1 second.

On the basis of the described approach, Samara University scientists have already proposed a technology capable of providing a resolution of 18 m for surveying the

Earth's surface from a nanosatellite. While the optical systems on the market provide a resolution of 40 m.

In addition, the use of an ultralight harmonic lens and image reconstruction technology based on the CNN enabled scientists to increase the PSNR (Peak Signal-to-Noise Ratio) to 26 dB in real images. "Five years ago obtaining a high-resolution colour image using a diffraction lens seemed a distant goal. However, the results of our studies have shown the promise of using light diffraction optics, - noted Artem Nikonorov. - The fact that our work has been published by the authoritative journal IEEE, which has a Q1 quartile in such fields as "Space Sciences" and "IT in the Earth Sciences", suggests that international experts see a great future for this direction".

In the future, the research group of Samara University is going to continue the work on overcoming strong aberrations in the images. To solve this problem, they plan to improve the technology of manufacturing ultralight lenses as well as image reconstruction methods and improve the performance of neural network reconstruction.

###

For reference

When manufacturing a 256-level diffraction harmonic lens, a photosensitive substance - resist - is applied to the surface of silica glass. Its thickness is 7 microns (for comparison, the thickness of a human hair is 40-90 microns). With the help of a laser beam a 256-level relief is drawn on the resist. An 'approximation' of an object happens with its help. The production process of one lens takes about half an hour. The compensation of distortions is provided by the digital processing of images on the basis of extremely-precise neuron networks".

Media Contact

Olga Buhner
buhner@ssau.ru
7-917-158-3348

 @smr_university

http://www.ssau.ru/ 

Olga Buhner | EurekAlert!
Further information:
https://ssau.ru/english/news/15681
http://dx.doi.org/10.1109/JSTARS.2018.2856538

More articles from Physics and Astronomy:

nachricht Gravitational Waves Could Shed Light on Dark Matter
22.10.2018 | Universität Zürich

nachricht Thin films from Braunschweig on the way to Mercury
19.10.2018 | Fraunhofer-Institut für Schicht- und Oberflächentechnik IST

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: Goodbye, silicon? On the way to new electronic materials with metal-organic networks

Scientists at the Max Planck Institute for Polymer Research (MPI-P) in Mainz (Germany) together with scientists from Dresden, Leipzig, Sofia (Bulgaria) and Madrid (Spain) have now developed and characterized a novel, metal-organic material which displays electrical properties mimicking those of highly crystalline silicon. The material which can easily be fabricated at room temperature could serve as a replacement for expensive conventional inorganic materials used in optoelectronics.

Silicon, a so called semiconductor, is currently widely employed for the development of components such as solar cells, LEDs or computer chips. High purity...

Im Focus: Storage & Transport of highly volatile Gases made safer & cheaper by the use of “Kinetic Trapping"

Augsburg chemists present a new technology for compressing, storing and transporting highly volatile gases in porous frameworks/New prospects for gas-powered vehicles

Storage of highly volatile gases has always been a major technological challenge, not least for use in the automotive sector, for, for example, methane or...

Im Focus: Disrupting crystalline order to restore superfluidity

When we put water in a freezer, water molecules crystallize and form ice. This change from one phase of matter to another is called a phase transition. While this transition, and countless others that occur in nature, typically takes place at the same fixed conditions, such as the freezing point, one can ask how it can be influenced in a controlled way.

We are all familiar with such control of the freezing transition, as it is an essential ingredient in the art of making a sorbet or a slushy. To make a cold...

Im Focus: Micro energy harvesters for the Internet of Things

Fraunhofer IWS Dresden scientists print electronic layers with polymer ink

Thin organic layers provide machines and equipment with new functions. They enable, for example, tiny energy recuperators. In future, these will be installed...

Im Focus: Dynamik einzelner Proteine

Neue Messmethode erlaubt es Forschenden, die Bewegung von Molekülen lange und genau zu verfolgen

Das Zusammenspiel aus Struktur und Dynamik bestimmt die Funktion von Proteinen, den molekularen Werkzeugen der Zelle. Durch Fortschritte in der...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Conference to pave the way for new therapies

17.10.2018 | Event News

Berlin5GWeek: Private industrial networks and temporary 5G connectivity islands

16.10.2018 | Event News

5th International Conference on Cellular Materials (CellMAT), Scientific Programme online

02.10.2018 | Event News

 
Latest News

Gravitational Waves Could Shed Light on Dark Matter

22.10.2018 | Physics and Astronomy

Nanocages in the lab and in the computer: how DNA-based dendrimers transport nanoparticles

19.10.2018 | Life Sciences

Thin films from Braunschweig on the way to Mercury

19.10.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>