Search Results - Thermal radiation
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Thermal radiation is electromagnetic radiation emitted from the surface of an object which is due to the object's temperature. An example of thermal radiation is the infrared radiation emitted by a common household radiator or electric heater. A person near a raging bonfire will feel the radiated heat of the fire, even if the surrounding air is very cold. Thermal radiation is generated when heat from the movement of charged particles within atoms is converted to electromagnetic radiation. Solar radiation heats the earth during the day, while at night the earth re-radiates some heat back into space. If the object is a black body in thermodynamic equilibrium, the radiation is termed black-body radiation. The emitted wave frequency of the black body thermal radiation is described by a probability distribution depending only on temperature, and for a genuine black body in thermodynamic equilibrium is given by Planck’s law of radiation. Wien's law gives the most likely frequency of the emitted radiation, and the Stefan–Boltzmann law gives the radiant intensity. There are four main properties that characterize thermal radiation These properties apply if the distances considered are much larger than the wavelengths contributing to the spectrum (around 10 micrometres at 300 K). Indeed, thermal radiation here takes only travelling waves into account. A more sophisticated framework involving electromagnetics has to be used for lower distances (near-field thermal radiation).
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Showing 1 to 12 of 12 Articles matching 'Thermal radiation' in related articles. |
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1. Terramed Alliance News Treating Breast Cancer With Adapted Space-Industry Technology
November 18, 2009
Terramed Alliance News Researchers at Rush University Medical Center and Argonne National Laboratory are collaborating on a study to determine if an imaging technique used by NASA to inspect the space shuttle can be used to predict tissue damage often experienced by breast cancer patients undergoing radiation therapy. The study is examining the utility of three-dimensional thermal tomography in radiation oncology.
Preliminary results from the study are being displayed during the American Society for Radiation Oncology (ASTRO) Annual Meeting in Chicago, being held from November 1 - 5, 2... (read more)
Author: Fiona Lewis
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2. Laser Acupuncture for Weight Loss
November 01, 2009
Laser acupuncture is a combination of the old and new, it uses the ancient Chinese way of curing illness by acupuncture and laser which is a form of non-thermal and low intensity radiation that is considered harmless to the body. The approach is almost natural that the targeted points in the body result to more positive motivation and willpower to lose weight. This also helps stimulate an overall well-being of the body. This new method of treatment is almost painless and non-invasive; it stimulates certain points in the body that would make weight loss possible.
The benefits of laser acup... (read more)
Author: Shane Ennerson
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3. Information on Trade Radiators
October 28, 2009
Trade radiators are designed to transfer thermal energy from one medium to another for the purpose of space heating or cooling. Heat transfer is studied in chemical or mechanical engineering. Thermodynamics plays an important role in heat transfer as it is essential in understanding the method of heat transfer. Energy conversion, thermofluids, and mass transfer also aid in understanding heat transfer processes. Trade radiators are radiation-emitting materials solely for trade used in industrial and residential areas for heat exchanges. However, trade radiators are commonly purchased for ho... (read more)
Author: Jolly Hayden
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4. Use Infrared Cameras for High Quality Images
October 27, 2009
Infrared Cameras are also known as thermographic cameras. They are a valuable innovation in the field of photography. These devices provide high-quality thermal imaging solutions on the basis of infrared radiation. These images are required in fields like astronomy and healthcare.
History of thermographic technology
Infrared cameras were first used during the Korean War. The reason behind this was that they were extremely useful while fighting in the dark. These cameras work on the basis of heat detection and thus they would be used to identify the position of soldiers when they fou... (read more)
Author: orson dixon
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5. Advantages of Solar Power
October 12, 2009
Living in Nevada, the sun is an almost consistent companion. This gives Nevadans a unique possibility to use solar radiation powers for good. In April, a tour of southern Nevada homes shed some light on the subject of solar powered homes. Hosted by the American Solar Energy Society, this Nevada branch of the National Solar Tour explored homes that used both passive and active solar power, thermal hot water systems, and other environmentally characteristics. However, unless you're a green technologies professional, or took the tour, you may not know the difference between passive and active sol... (read more)
Author: Calvin Tan
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6. The Pros and Cons of LLLT
October 02, 2009
Low level laser therapy, or LLT, is a relatively new medical field. It came about in the mid-60s, just a few years after the first successful laser test. Before the laser was invented and successfully tested, studies into the medical uses of light concentrated primarily on the thermal and destructive properties of light and radiation. LLT was one of the first fields dealt with the study of medical laser treatments in a new way by focusing on the non-destructive, non-thermal health benefits of laser treatment. The Pros Endre Mester, a Hungarian researcher working at Semmelweis Univer... (read more)
Author: Ryan Frank
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7. Tips to Save the Life of Mobile Phone Users
February 20, 2009
Despite its many advantages, a mobile phone often triggers a series of health risks when used carelessly. The direct exposure to a it often ends up gifting you ailments like dizziness, headaches, loss of concentration, mood swings etc, thanks to its non-thermal effects.
Such complications might be of trivial importance for you, but researches say that even dreading diseases like cancer can be caused. Moreover, there are strict warnings for a pregnant woman to reduce the careless use of her mobile.
The radiation might cause genetic and birth defects to the baby inside. Would you belie... (read more)
Author: Pattrick Savarna
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8. Use of Medical Infrared Cameras in medical science
February 10, 2009
Infrared camera or thermo graphic camera is a tool that applies infrared radiation to construct an image. Generally, these types of cameras were developed for military purpose. However, in recent times, infrared camera is considered to be a vital instrument of choice not only by intelligence officers and law enforcers, but also by archaeologists and doctors. Infrared cameras are used extensively in the field of medicines and diagnosing disease. It works very effectively in cancer screening.
Various applications of infrared camera in medical science
Medical infrared cameras are used i... (read more)
Author: orson dixon
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9. Fluke Ti10 Thermal Imager - Infrared IR Imaging Camera
November 26, 2008
The perfect tool for troubleshooting and maintenance.
This thermal imager is built for tough work environments. Its high-performance, fully radiometric infrared camera is ideal for troubleshooting electrical installations, HVAC/R equipment, process equipment, electro-mechanical equipment, and others.
Thermo-graphic imaging cameras detect radiation in the infrared range of the electromagnetic spectrum (900–14,000 nanometers or 0.9–14 µm) and from that radiation produce images. According to the black body radiation law, objects above 0 Kelvin radiate infrared radiation. With the Flu... (read more)
Author: Julia Aidan
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10. Fluke Ti25 Thermal Imager - Infrared IR Imaging Camera
November 26, 2008
The ultimate tool for troubleshooting and maintenance.
This thermal imager is built for extremely tough work environments. Its fully radiometric, high-performance infrared camera is designed for troubleshooting HVAC/R equipment, electro-mechanical equipment, electrical installations, process equipment, and more.
Thermo-graphic imaging cameras detect radiation in the infrared range of the electromagnetic spectrum (900–14,000 nanometers or 0.9–14 µm) and from that radiation produce images. According to the black body radiation law, objects above 0 Kelvin radiate infrared radiation. ... (read more)
Author: Julia Aidan
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11. The Many Faces of Solar Power
July 15, 2008
Living in Nevada, the sun is an almost constant companion. This gives Nevadans a unique opportunity to use solar radiation powers for good. In April, a tour of southern Nevada homes shed some light on the subject of solar powered homes. Hosted by the American Solar Energy Society, this Nevada branch of the National Solar Tour explored homes that used both passive and active solar power, thermal hot water systems, and other environmentally features. However, unless you're a green technologies expert, or took the tour, you may not know the difference between passive and active solar, or how the... (read more)
Author: Mark Hostetler
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12. How Greenhouses Work
July 10, 2006
Greenhouses work by the differing transparency of glass to solar and thermal radiation. Glass is transparent to most of the wavelengths of solar radiation, but is thick to the much longer (thermal infrared) wavelengths released by the plants and soil inside the greenhouse. Solar radiation is able to enter the greenhouse, where it is absorbed by the plants and heats them up. The longer thermal wavelengths emitted by the heated plants cannot get out through the glass so heat keeps building up. Plastic greenhouses, however, appear to work as well as glass ones. The plastic is not nearly as transp... (read more)
Author: Shawn Hart
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