![]() How to cite the article suggest additional literature OCLC 954868912.Encyclopedia > letter O > Optical spectrum Optical Spectrumĭefinition: the decomposition of the power or energy of light according to different wavelengths or optical frequenciesĬategories: general optics, light detection and characterization, physical foundations Galileo at work : his scientific biography. hearings before the United States House Committee on Science and Astronautics, Ninety-First Congress, first session, on Mar. ^ United States Congress | Committee on Science and Astronautics (1973).Free space optical networks for ultra-broad band services. ^ "The Atmospheric Window | US Department of Commerce, NOAA". ![]() ^ "Climate Science Investigations South Florida - Energy: The Driver of Climate".Air Force Cambridge Research Laboratories, Office of Aerospace Research, United States Air Force. Rayleigh Scattering in the Upper Atmosphere. ^ Fluorocarbons, Environmental and Health Implications: Environmental Impact Statement.After the 1940s, the development of radio telescopes gave rise to the even more successful field of radio astronomy that utilized the radio window. The first great astronomical discoveries such as the ones made by the famous Italian polymath Galileo Galilei were made using optical telescopes that received light reaching the ground through the optical window. Up until the 1940s, astronomers could only use the visible and near infrared portions of the optical spectrum for their observations. Historical importance for observational astronomy The optical atmospheric window is the optical portion of the electromagnetic spectrum that passes through the earth's atmosphere, excluding its infrared part although, as mentioned before, the optical spectrum also includes the IR spectrum and thus the optical window could include the infrared window (8 – 14 μm), the latter is considered separate by convention, since the visible spectrum is not contained in it. Extreme UV and X-rays are produced (at left of wavelength range shown) but comprise very small amounts of the Sun's total output power. The optical atmospheric window Solar irradiance spectrum above atmosphere and at surface. Disambiguation of the term 'optical spectrum' Īlthough the word optical, deriving from Ancient Greek ὀπτῐκός (optikós, “of or for sight”), generally refers to something visible or visual, the term optical spectrum is used to describe the sum of the visible, the ultraviolet and the infrared spectra (at least in this context). The earth's atmosphere is not totally transparent and is in fact 100% opaque to many wavelengths (see plot of Earth's opacity) the wavelength ranges to which it is transparent are called atmospheric windows. Sunlight mostly reaches the ground through the optical atmospheric window the sun is particularly active in most of this range (44% of the radiation emitted by the sun falls within the visible spectrum and 49% falls within the infrared spectrum). The window runs from around 300 nanometers ( ultraviolet-B) up into the range the human eye can detect, roughly 400–700 nm and continues up to approximately 2 μm. The optical window is a range of wavelengths that are not blocked by the earth's atmosphere. Rough plot of Earth's atmospheric transmittance (or opacity) to various wavelengths of electromagnetic radiation, including visible light. For the optical element, see Window (optics). ![]()
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