Tsayawa Tafin Tama da Tsayawan Tafin Tama da Solar Reflectance Index

Zaka iya kasance Reflectance

Reflectance tana cewa yadda radiant flux ya kawo daga maza ko kaya na kayan mutum (фr) zuwa radiant flux na biyu (фi). Reflectance tana nufin da ρ (ko p).

Reflectance tana cewa yadda radiant flux ya kawo. Saboda haka, ba tare da unit ba. Reflectance tana canza a kan yadda wavelength distribution na biyu. Reflectance da transmittance suna da mu'amala masu tabbacin bayanai.

Reflectance tana girma da sauransu. Yadda gama tana specular reflectance (ρs) kuma yadda gama tana diffuse reflectance (ρd).

Specular reflectance tana cewa radiant flux wanda ba ta kawo ko kusa. Misali, reflection da mirror.

Diffuse reflectance tana cewa radiant flux wanda ta kawo a cikin yanayi. Misali, reflection da cinema screen.

Total reflectance tana jumla da specular reflectance da diffuse reflectance.

Reflectivity

Reflectivity tana cewa siffofin kayan mutum don ka kawo light ko radiation. Tana shirin reflectance baki daya game da thickness na kayan mutum.

Reflectivity da Reflectance suna da mu'amala masu tabbacin bayanai don kayan mutum mai homogenous da semi-infinite. Amma tana da mu'amala masu tabbacin bayanai don kayan mutum mai finite da layered material.

Reflectance vs Reflectivity

Reflectance da Reflectivity suna da mu'amala masu tabbacin bayanai. Tashar beda daga Reflectance zuwa Reflectivity tana bayyana a nan.

Idan light ya kawo a thin layer na kayan mutum, internal reflection effect tana kawo reflectance. Tana canza a kan surface thickness. Amma reflectivity tana value wanda ya faruwa a thick reflecting objects.

Reflectivity tana limit value na reflectance idan sample tana thick. Tana intrinsic reflection na surface.

Reflectance tana fraction na electromagnetic power reflected form material ko surface. Reflectivity tana siffofin kayan mutum.

Reflection Measurement

Idan light ya kawo a sample, zai kawo daga sample. Reflected light tana ciki ne da specular reflected light da diffuse reflected light.

Kamar yadda aka nuna a nan, light tana kawo a sample a angle na θ. Wannan angle tana nufin incident angle.

Specular reflected light tana light wanda ta kawo daga shiny surface na sample da diffuse reflected light tana light wanda ta kawo daga rough surface na sample.

Idan sample tana da rough da shiny surfaces, measure both reflected light and combine them to measure the total reflected light.

Reflectance measurement tana measure relative or absolute reflected light.

Relative reflectance measurement calculates the proportional amount of reflected light, relative to the amount of reflected light from a reference plate. The mirror or barium sulfate plate used as a reference plate. Here, we have assumed that the reflectance of a reference plate is 100%. The equation to measure the relative reflectance is; 

Absolute reflectance measures the proportional amount of reflected light relative to the amount of light measured directly from a light source. Here, no reference plate is used. But reflectance measurement values are based on assuming a 100% reflectance of air. The equation to measure the absolute reflectance is;

Spectral Reflectance Curve

Reflectance tana function na wavelength na electromagnetic energy. Spectral reflectance ko Spectral reflectance curve tana graph na Wavelength vs %Reflectance.

Spectral reflectance curve tana measure yadda energy ita za kawo a cikin wavelength. Spectral reflectance tana da mu'amala masu tabbacin bayanai don earth surface features.

Tana curve wanda tana bayyana yadda reflectance na material ko surface a cikin wavelength throughout the visible spectrum, tare da determining the color of material ko surface.

A nan tana spectral reflectance curve don different surfaces for different wavelengths.

Solar Reflectance Index

Solar reflectance index ko solar reflectivity tana capability na kayan mutum don ka kawo solar energy daga surface na kayan mutum zuwa atmosphere.

Value na solar reflectance index tana canza daga 0 zuwa 1. Idan kayan mutum tana absorb all solar energy value na solar reflectance index tana 0 amma idan kayan mutum tana kawo all solar energy value na solar reflectance index tana 1.

Attenuated Total Reflectance (ATR)

Attenuated Total Reflectance (ATR) tana sampling technique useful for studying the surface of a material. This technique works on the multiple internal reflections of the beam incident on the sample.

Idan infrared beam tana kawo a high reflective index medium to low reflective index medium, some amount of light tana kawo back into the low reflective index medium. Wannan tana nufin internal reflection.