Jirgi da Luminance

Radiance ita ce ta fitaccen kwallon karamin zafi daga yawan mutum zuwa wurin da ba da shi, a cikin farko na yawan tsari mai karfi da ke da shi.
Radiance tana nufin Le,λ kuma tana iya kan biyuwar hanyar fitaccen kwallon karamin zafi zuwa yawan tsari As da kuma farko na yawan tsari ωs.

idani, ÆŸ tana wani tashin da ke da jirgin da yawan tsari da kuma wurin da aka bayar.
dAs tana wani yawan tsari da kuma dωs tana wani farko na yawan tsari da ke da wurin da aka bayar.
Farko na radiance tana W/sr-m2.

A cikin abubuwan photometric, radiance tana nufin Luminance.
Zan iya amfani da abuwar hanyar don samun luminance daga radiance.

Idani, Km tana wani matsayi da ke nufin maximum spectral luminous efficacy da kuma darajinta tana 683 lm/W.

Saboda haka Luminance tana nufin fitaccen kwallon karamin zafi daga yawan mutum zuwa wurin da ba da shi, a cikin farko na yawan tsari mai karfi da ke da shi.
Luminance tana nufin

Farko na Luminance tana Lm/sr-m2 ko Cd/m2.
Idan muna yi bincike game da conservation of radiance da Luminance, za mu iya gani cewa radiance da Luminance daga source da kuma detector tana sama iya.

Yana haɗa saboda, idan muna yi tasiri cewa radiation ba ta kasance ko lalace a cikin medium da energy take faru daga source zuwa detector, yana iya kasance cewa Φs = ΦD.
Luminance tana wani abu da ke sama a cikin system.
Luminance tana sama daga source zuwa detector.
Luminance ba tana source quantity ko detector quantity ba.
Luminance tana wani abu geometric da ke sama a beam connecting source da detector. Conservation of luminance tana sama a presence of lenses ko optics.

Basic relationship between the luminance and the luminous flux tana nufin,
Φ = LG,
G tana geometric angle in steradian.

Brightness tana Luminance

Luminance ba zan iya ci gaba ko kawo wanda ba suka amfani da optical system. System tana iya ci gaba ko kawo luminous flux. Idan muna yi tasiri cewa page ta littafi tana da certain luminance, muna iya amfani da abuwar hanyar don samun equation:

Idani, ER tana Illuminance on the book that redirects to our retina. Equation tana nufin cewa eye tana canza luminance zuwa Illuminance on the retina. Duk detectors suna yi waɗannan da retina tana yi. Retina tana reji da flux density of the radiant field, wanda tana nufin Illuminance. Principle physiological sensation of brightness tana nuna da luminance of the source we are looking at.
Radiance da luminance tana da nasara

Idani, Km tana wani matsayi da ke nufin maximum spectral luminous efficacy da kuma darajinta tana 683 lm/W.
Lv tana luminance measured in cd/m2 da Le,λ tana radiance measured in W/m2-sr.

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