Karamin Lura da Abubuwa

Irradiance shine da radiant flux da aka samu na maza ta shirya. Ingancin irradiance shine W/m2. Irradiance ana nufin Ee,λ,

φs shine radiant flux da aka samu a maza ta shirya da AD shine maza ta shirya ko kafin.
Irradiance yana dogara da Inverse Square Law. Idan min wani wurin tsohon radiya suka sami radiant flux zuwa biyu masu maza ta shirya na A1 da A2 inda suke fiye, suna cikin r1 da r2.

Idan haka flux da aka samu a maza ta shirya

Da flux da aka samu a maza ta shirya
Inda Ie,λ shine radiant intensity da ω shine solid angle.

Sai dai radiant flux da aka samu per unit area for A1 da A2 are

Amsa A1 da A2 suke fiye.
An yi φe,λ = Ie,λ ω a zabe an samu

Wannan shine Inverse Square Law of irradiance.

Idan mutum ya gama wannan irradiance zuwa Illuminance maka ya kamata a yi conversion equation i.e.

Inda Km shine constant wanda ake nufin maximum spectral luminous efficacy da kuma irin value shine 683 lm/W.
By definition the luminous flux da aka samu per unit area of the detector is called Illuminance.
Ingancin shine Lux ko Lumen per sq. meter (lm/sq. m).
Ko kuma ya dogara da same inverse square law, i.e.


Ev shine related to the surface dA inda luminous flux shine ka faruwa a wannan surface perpendicularly.
E’v shine related to the surface dA’ inda wannan surface shine karkashin angle Ɵ zuwa base plane.
As per figure above,

Wannan equation ya zama generalized,

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