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 Heat flow through single molecules detected
19.07.2019 | Okinawa Institute of Science and Technology (OIST) Graduate University

nachricht Better thermal conductivity by adjusting the arrangement of atoms
19.07.2019 | Universität Basel

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: Better thermal conductivity by adjusting the arrangement of atoms

Adjusting the thermal conductivity of materials is one of the challenges nanoscience is currently facing. Together with colleagues from the Netherlands and Spain, researchers from the University of Basel have shown that the atomic vibrations that determine heat generation in nanowires can be controlled through the arrangement of atoms alone. The scientists will publish the results shortly in the journal Nano Letters.

In the electronics and computer industry, components are becoming ever smaller and more powerful. However, there are problems with the heat generation. It is...

Im Focus: First-ever visualizations of electrical gating effects on electronic structure

Scientists have visualised the electronic structure in a microelectronic device for the first time, opening up opportunities for finely-tuned high performance electronic devices.

Physicists from the University of Warwick and the University of Washington have developed a technique to measure the energy and momentum of electrons in...

Im Focus: Megakaryocytes act as „bouncers“ restraining cell migration in the bone marrow

Scientists at the University Würzburg and University Hospital of Würzburg found that megakaryocytes act as “bouncers” and thus modulate bone marrow niche properties and cell migration dynamics. The study was published in July in the Journal “Haematologica”.

Hematopoiesis is the process of forming blood cells, which occurs predominantly in the bone marrow. The bone marrow produces all types of blood cells: red...

Im Focus: Artificial neural network resolves puzzles from condensed matter physics: Which is the perfect quantum theory?

For some phenomena in quantum many-body physics several competing theories exist. But which of them describes a quantum phenomenon best? A team of researchers from the Technical University of Munich (TUM) and Harvard University in the United States has now successfully deployed artificial neural networks for image analysis of quantum systems.

Is that a dog or a cat? Such a classification is a prime example of machine learning: artificial neural networks can be trained to analyze images by looking...

Im Focus: Extremely hard yet metallically conductive: Bayreuth researchers develop novel material with high-tech prospects

An international research group led by scientists from the University of Bayreuth has produced a previously unknown material: Rhenium nitride pernitride. Thanks to combining properties that were previously considered incompatible, it looks set to become highly attractive for technological applications. Indeed, it is a super-hard metallic conductor that can withstand extremely high pressures like a diamond. A process now developed in Bayreuth opens up the possibility of producing rhenium nitride pernitride and other technologically interesting materials in sufficiently large quantity for their properties characterisation. The new findings are presented in "Nature Communications".

The possibility of finding a compound that was metallically conductive, super-hard, and ultra-incompressible was long considered unlikely in science. It was...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

2nd International Conference on UV LED Technologies & Applications – ICULTA 2020 | Call for Abstracts

24.06.2019 | Event News

SEMANTiCS 2019 brings together industry leaders and data scientists in Karlsruhe

29.04.2019 | Event News

Revered mathematicians and computer scientists converge with 200 young researchers in Heidelberg!

17.04.2019 | Event News

 
Latest News

Heat flow through single molecules detected

19.07.2019 | Physics and Astronomy

Heat transport through single molecules

19.07.2019 | Physics and Astronomy

Welcome Committee for Comets

19.07.2019 | Earth Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>