Infra red radiation is electromagnetic radiation and expected to follow optical rules
Optical principles for certain materials apply to a particular area of electromagnetic radiation specter. Through some material the radiation passes, some absorb it, and some reflect it.
Dear Satish Narula
Yes. Thermal radiation (heat transfer through radiation) follows the same principles as optical radiation. They cover different ranges of the electromagnetic spectrum, but the physical laws apply.
https://en.wikipedia.org/wiki/Thermal_radiation
https://en.wikipedia.org/wiki/Optical_radiation
https://en.wikipedia.org/wiki/Visible_spectrum
"Thermal Radiation Heat Transfer" by Siegel and Howell is a good book on the topic:
https://www.amazon.com/Thermal-Radiation-Heat-Transfer-Fourth/dp/1560328398
All the best
Johan
The heat transfer by radiation follows the same principles as optical radiation.
Radiation is the transfer of energy across a system boundary by electromagnetic mechanism which occurs by temperature difference. According to spectrum of electromagnetic radiation, in the wave length range of 10-5 microns to 104 microns: gamma rays, x- rays, ultraviolet rays, infrared, thermal and micro waves are existing. Only a part of ultraviolet rays (wave length, 10-2 microns to 0.4 microns), complete infrared radiation as mentioned (wave length, 0.7 microns to 102 microns) falls wholly in thermal radiation (wave length, 10-1 microns to 102 microns). These thermal radiations have characteristics of visible light and follow optical laws. They reflect, refract and also subject to scattering and absorption when they pass through medium. Hence thermal radiation only follows optic laws and since infrared rays happen to be in the wave band of thermal radiation, infrared rays as mentioned also completely follow optic laws.
Yes. But you have to use specfic materials for yours optical elements (lenses, mirrors etc). For example - for 10 mkm infrared radiation you need ZnSe lenses, no optic glass.
- Badges
- Science topic
- Similar topics
- Engineering
- Thermal Engineering
- Thermofluid
- Heat Transfer