Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Infrared remote sensing to measure the temperature of flames

09.04.2008
Scientists from the Universidad Carlos III of Madrid study the use of optical techniques for the measurement of parameters, mainly of the temperature of the flame, in combustion processes in order to control them automatically, reduce the contamination and increase efficiency.

In airplane engines or in some industrial combustion chambers, combustion reactions take place in extreme conditions of heat and pressure, making these environments too harsh for investigation. Nevertheless, a research group from the Universidad Carlos III of Madrid (UC3M) seeks new methods to improve sensing and data collection in such places.

Esteban García-Cuesta, supervised by Antonio J. de Castro and Inés M. Galván, from the departments of physics and Information Technology (IT) of the UC3M respectively, works in a multidisciplinary project for the recovery of physical properties of combustion processes, more specifically the temperature of the flame. This property is very important since it represents all the chemical information about the reaction. Hence, knowing the temperature, the global status of the reaction could be determined and modified automatically when required.

Castro and his team use computer simulations of optical techniques, in particular the infrared emission spectroscopy of the gases produced in the reaction, such as carbon monoxide (CO), or nitrogen oxides (NOx). These compounds, that have clear infrared emission spectral bands, have been selected by the researchers as the parameters to be measured. The spectral information is mathematically related to the temperature of the flame, allowing for its calculation inside a combustion chamber. However, there is the added complication that the translation of the spectra into a temperature profile exhibits a non linear relationship which Professor Castro considers a significant problem, since different temperatures could have very similar spectra, hence producing multiple answers rather than an unique value for the temperature.

Neural networks

The research team applied the multilayer perceptron neural network to translate the spectral data in to thermal data. Since the spectral measurements are taken in high definition, the required calculations for their interpretation using "machine learning" techniques is very high which reduces the performance. Professor Castro stated that although a lot of spectral data is required to evaluate the spectrum accurately, the excess of information is not suitable for a neural network approach. Hence new filters and extraction characteristic techniques must be developed to allow for a reduction in the number of parameters considered while maintaining the accuracy of the information. For this reason, the researchers apply the networks training as an intelligent process of information selection, in this case wavelengths, in order to extract the physical information required and avoid redundancy. Professor Castro underlines that the way in which the information is presented to the neural network is crucial, and at this precise point is where their research centres.

For next stage. these scientists plan to tackle the measurement of spectra in real systems. So far, they have managed to determine theoretical measurements of temperatures with accurate results (about 3 degrees Kelvin more precise at the hottest point of the flame). These computational studies aim to determine the viability of such techniques for the conversion of data.

This temperature monitoring, used in conjunction with feedback systems, could achieve automatic control of the combustion processes. These later systems would receive the information about the combustion reaction, analyse the status of the reaction and feed it back to the system, while possessing the capability to change variables such as the flow of gases and fuel involved, thereby grasping control over the whole process. This would be key for the reduction in the contamination produced and to attain an increased efficiency of the reaction.

The study Multilayer perceptron as inverse model in a ground-based remote sensing temperature retrieval problem has been published in the magazine Engineering Applications of Artificial Intelligence by Esteban García Cuesta, Inés M. Galván y Antonio J. De Castro, researchers at the UC3M.

Oficina Información Científica | alfa
Further information:
http://www.elsevier.com/wps/find/journaldescription.cws_home/975/description#description

More articles from Interdisciplinary Research:

nachricht Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs
07.11.2017 | Technische Universität München

nachricht NRL clarifies valley polarization for electronic and optoelectronic technologies
20.10.2017 | Naval Research Laboratory

All articles from Interdisciplinary Research >>>

The most recent press releases about innovation >>>

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

Im Focus: Nanoparticles help with malaria diagnosis – new rapid test in development

The WHO reports an estimated 429,000 malaria deaths each year. The disease mostly affects tropical and subtropical regions and in particular the African continent. The Fraunhofer Institute for Silicate Research ISC teamed up with the Fraunhofer Institute for Molecular Biology and Applied Ecology IME and the Institute of Tropical Medicine at the University of Tübingen for a new test method to detect malaria parasites in blood. The idea of the research project “NanoFRET” is to develop a highly sensitive and reliable rapid diagnostic test so that patient treatment can begin as early as possible.

Malaria is caused by parasites transmitted by mosquito bite. The most dangerous form of malaria is malaria tropica. Left untreated, it is fatal in most cases....

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

Previous evidence of water on mars now identified as grainflows

21.11.2017 | Physics and Astronomy

NASA's James Webb Space Telescope completes final cryogenic testing

21.11.2017 | Physics and Astronomy

New catalyst controls activation of a carbon-hydrogen bond

21.11.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>