Emissivity - Wikipedia
In its most general form, emissivity can be specified for a particular wavelength, direction, and polarization. However, the most commonly used form of emissivity is the hemispherical total emissivity, which considers emissions as totaled over all wavelengths, directions, and polarizations, given a particular temperature. [13]: 60
比辐射率 - 百度百科
比辐射率是反映物体 热辐射 性质的一个重要参数，与物质的结构、成份、表面特性、温度以及电磁波发射方向、波长 (频率) 等因素有关。 求地表比辐射率的方法主要有差值法、独立温度光谱指数法 (T IS I) 和 NDVI 门槛值法 (NDV ITHM) 等方法。 地球表面不同区域的地表结构虽然很复杂，但从卫星像元的尺度来看，主要由水面、植被和裸土 3 种地物类型构成, 故利用覃志豪等人 NDVI 门槛值法来估算地表比辐射率。 而由于 AVHRR （NOAA 气象卫星是近极地、与太阳同步的 …
emissivity（英语单词）_百度百科
emissivity /ɪmɪˈsɪvɪtɪ, ˌɛm-/ 1.N a measure of the ability of a surface to radiate energy; the ratio of the radiant flux emitted per unit area to that emitted by a black body at the same temperature 比辐射率 ( symbol: ε) [1]
Emissivity - Humboldt State University
The emissivity (ε) of a material is the relative ability of its surface to emit heat by radiation. Emissivity is defined as the ratio of the energy radiated from an object's surface to the energy radiated from a blackbody at the same temperature. Emissivity values can range from 0 to 1.
What is emissivity and why is it important? - NPL - NPLWebsite
Emissivity is defined as the ratio of the energy radiated from a material's surface to that radiated from a perfect emitter, known as a blackbody, at the same temperature and wavelength and under the same viewing conditions. It is a dimensionless number between 0 (for a perfect reflector) and 1 (for a perfect emitter).
Emissivity – absorption, black body, thermal radiation - RP …
The emissivity of an object or a surface is a measure for how strongly it interacts with thermal radiation in terms of emission and absorption. It can have a value between 0 and 1, and it can be dependent on the optical frequency or wavelength, also on the direction of incidence and the polarization of light.
Emissivity - an overview | ScienceDirect Topics
Emissivity (ε) is a measure of the radiated surface of the material or level of heat (scaled from 0 to 1) that is released into the surroundings (Maria et al., 2013). It is the electromagnetic radiation of energy emitted from any material when the temperature increases to above 0 K …
EMISSIVITY中文(简体)翻译：剑桥词典 - Cambridge Dictionary
Low emissivity glass reflects interior heat back into the room. The amount of radiation emitted is partly determined by the emissivity of the material. This sensor is used to measure emissivity. The metal was painted black to enhance its emissivity.
Emissivity - Neutrium
Introduction. Emissivity ( $\epsilon$ ) is the ratio of radiation emitted by a surface to that emitted by a blackbody at the same temperature. As a blackbody emits the maximum amount of radiation possible over all wavelengths, emissivity lies in the range $0 \lt \epsilon \le 1 $ .
What is Emissivity? - Arizona State University
Emissivity: the Temperature Equalizer. One of the ways to describe the infrared energy emitted by molecules is in terms of radiance: watts of energy per unit of area. With changes in temperature, come changes in radiance. For example, the radiance from a mineral at one temperature will be different from that at another temperature. In order to ...
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