Reflectance Wikipedia. Reflectance of the surface of a material is its effectiveness in reflecting radiant energy. Reflectance of the surface of a material is its effectiveness in reflecting radiant energy. It is the fraction of incident electromagnetic power that is reflected at. Continues from forumreplies. OK I give up that post from the last thread is unsalvageable. Sorry everyone As you were. GIS and Remote Sensing Glossary of terms. A GLOSSARY of GIS and REMOTE SENSING TERMS Please see the bottom of the page for references and citations. Here you can download fire emblem souen no kiseki iso shared files Fire Emblem Seisen no Keifu. Fire emblem soen no kiseki path of radiance original. View and Download Adobe Photoshop CS6 user manual online. Photoshop CS6 Software pdf manual download. Path Of Radiance Iso' title='Path Of Radiance Iso' />It is the fraction of incident electromagnetic power that is reflected at an interface. The reflectance spectrum or spectral reflectance curve is the plot of the reflectance as a function of wavelength. Mathematical definitionseditHemispherical reflectanceeditThe hemispherical reflectance of a surface, denoted R, is defined as1Rerei,displaystyle Rfrac Phi mathrm e mathrm r Phi mathrm e mathrm i ,whereer is the radiant fluxreflected by that surface ei is the radiant flux received by that surface. Spectral hemispherical reflectanceeditThe spectral hemispherical reflectance in frequency and spectral hemispherical reflectance in wavelength of a surface, denoted R and R respectively, are defined as1Re,re,i,displaystyle Rnu frac Phi mathrm e ,nu mathrm r Phi mathrm e ,nu mathrm i ,Re,re,i,displaystyle Rlambda frac Phi mathrm e ,lambda mathrm r Phi mathrm e ,lambda mathrm i ,where. Directional reflectanceeditThe directional reflectance of a surface, denoted R, is defined as1RLe,r. Le,i,displaystyle ROmega frac Lmathrm e ,Omega mathrm r Lmathrm e ,Omega mathrm i ,where. Le,r is the radiancereflected by that surface Le,i is the radiance received by that surface. Spectral directional reflectanceeditThe spectral directional reflectance in frequency and spectral directional reflectance in wavelength of a surface, denoted R, and R, respectively, are defined as1R,Le,r. Le,i,displaystyle ROmega ,nu frac Lmathrm e ,Omega ,nu mathrm r Lmathrm e ,Omega ,nu mathrm i ,R,Le,r. Le,i,displaystyle ROmega ,lambda frac Lmathrm e ,Omega ,lambda mathrm r Lmathrm e ,Omega ,lambda mathrm i ,where. Reflectivityedit. Fresnel reflection coefficients for a boundary surface between air and a variable material in dependence of the complex refractive index and the angle of incidence. For homogeneous and semi infinite see halfspace materials, reflectivity is the same as reflectance. Reflectivity is the square of the magnitude of the Fresnel reflection coefficient,2 which is the ratio of the reflected to incident electric field 3 as such the reflection coefficient can be expressed as a complex number as determined by the Fresnel equations for a single layer, whereas the reflectance is always a positive real number. For layered and finite media, according to the CIE,citation needed reflectivity is distinguished from reflectance by the fact that reflectivity is a value that applies to thick reflecting objects. When reflection occurs from thin layers of material, internal reflection effects can cause the reflectance to vary with surface thickness. Reflectivity is the limit value of reflectance as the sample becomes thick it is the intrinsic reflectance of the surface, hence irrespective of other parameters such as the reflectance of the rear surface. Samsung Led 7000 Software Update on this page. Another way to interpret this is that the reflectance is the fraction of electromagnetic power reflected from a specific sample, while reflectivity is a property of the material itself, which would be measured on a perfect machine if the material filled half of all space. Surface typeeditGoing back to the fact that reflectance is a directional property, most surfaces can be divided into those that give specular reflection and those that give diffuse reflection for specular surfaces, such as glass or polished metal, reflectance will be nearly zero at all angles except at the appropriate reflected angle that is, reflected radiation will follow a different path from incident radiation for all cases other than radiation normal to the surface for diffuse surfaces, such as matte white paint, reflectance is uniform radiation is reflected in all angles equally or near equally. Such surfaces are said to be Lambertian. Most real objects have some mixture of diffuse and specular reflective properties. Water reflectanceedit. Reflectance of smooth water at 2. C refractive index 1. Reflection occurs when light moves from a medium with one index of refraction into a second medium with a different index of refraction. Specular reflection from a body of water is calculated by the Fresnel equations. Fresnel reflection is directional and therefore does not contribute significantly to albedo which is primarily diffuse reflection. A real water surface may be wavy. Php Mysqli Extension Is Missing Windows 10. Reflectance assuming a flat surface as given by the Fresnel equations can be adjusted to account for waviness. Grating efficiencyeditThe generalization of reflectance to a diffraction grating, which disperses light by wavelength, is called diffraction efficiency. ApplicationseditReflectance is an important concept in the fields of optics, solar thermal energy, telecommunication and radar. SI radiometry unitseditQuantity. Unit. Dimension. Notes. Name. Symbolnb 1Name. Symbol. Symbol. Radiant energy. Qenb 2joule. JML2T2. Energy of electromagnetic radiation. Radiant energy densitywejoule per cubic metre. Jm. 3ML1T2. Radiant energy per unit volume. Radiant fluxenb 2watt. Wor Js. ML2T3. Radiant energy emitted, reflected, transmitted or received, per unit time. This is sometimes also called radiant power. Spectral fluxe,nb 3ore,nb 4watt per hertzorwatt per metre. WHzor. Wm. ML2T2or. MLT3. Radiant flux per unit frequency or wavelength. The latter is commonly measured in Wnm1. Radiant intensity. Ie,nb 5watt per steradian. Wsr. ML2T3. Radiant flux emitted, reflected, transmitted or received, per unit solid angle. This is a directional quantity. Spectral intensity. Ie,nb 3or. Ie,nb 4watt per steradian per hertzorwatt per steradian per metre. Wsr1Hz1or. Wsr1m1. ML2T2or. MLT3. Radiant intensity per unit frequency or wavelength. The latter is commonly measured in Wsr1nm1. This is a directional quantity. Radiance. Le,nb 5watt per steradian per square metre. Wsr1m2. MT3. Radiant flux emitted, reflected, transmitted or received by a surface, per unit solid angle per unit projected area. This is a directional quantity. This is sometimes also confusingly called intensity. Spectral radiance. Le,nb 3or. Le,nb 4watt per steradian per square metre per hertzorwatt per steradian per square metre, per metre. Wsr1m2Hz1or. Wsr1m3. MT2or. ML1T3. Radiance of a surface per unit frequency or wavelength. The latter is commonly measured in Wsr1m2nm1. This is a directional quantity. This is sometimes also confusingly called spectral intensity. Irradiance. Flux density. Eenb 2watt per square metre. Wm. 2MT3. Radiant flux received by a surface per unit area. This is sometimes also confusingly called intensity. Spectral irradiance. Spectral flux density. Ee,nb 3or. Ee,nb 4watt per square metre per hertzorwatt per square metre, per metre. Wm2Hz1or. Wm. MT2or. ML1T3. Irradiance of a surface per unit frequency or wavelength. This is sometimes also confusingly called spectral intensity. Non SI units of spectral flux density include Jansky 1. Wm2Hz1 and solar flux unit 1. SFU 1. 02. 2 Wm2Hz11. Jy. Radiosity. Jenb 2watt per square metre. How To Prevent Smile Wrinkles.