@prefix isq: .
@prefix smart: .
@prefix rdf: .
@prefix dcterms: .
@prefix skos: .
a isq:Entry ;
rdf:type isq:Quantity ;
rdf:type smart:TermEntry ;
dcterms:identifier "7-6.2" ;
skosxl:prefLabel "spectral radiance"@en ;
skosxl:altLabel "L_(\"e\",lambda)"@en ;
skosxl:altLabel "(L_lambda)"@en ;
skos:definition "density of radiance with respect to wavelength, expressed by\n\n[stem%unnumbered]\n++++\nL_(\"e\",lambda) = (\"d\"L_\"e\")/(\"d\"lambda)\n++++\n\nwhere stem:[L_\"e\"] is radiance (<>) in terms of wavelength stem:[lambda] (<>)\n"@en ;
smart:hasBindingnessType "bindingness-type:normative" ;
dcterms:isPartOf ;
isq:hasUnit [
skos:notation "W/(sr*m^2*nm)" ;
skosxl:prefLabel "watt per steradian square metre nanometre"@en
] ;
isq:hasUnit [
skos:notation "kg*m^(-1)*s^(-3)*sr^(-1)" ;
skosxl:prefLabel "kilogram per metre second cubed steradian"@en
] ;
skos:note "For Planckian radiation,\n\n[stem%unnumbered]\n++++\nL_(\"e\",lambda)(lambda) = (c(lambda))/(4pi) omega_lambda (lambda) = hc_0^2*f(lambda,T)\n++++\n\nwhere stem:[c(lambda)] is phase speed (<>) of electromagnetic radiation of a wavelength (<>) stem:[lambda] in a given medium, stem:[omega_lambda(lambda)] is spectral radiant energy density in terms of wavelength, stem:[c_0] is speed of light in vacuum (<>), stem:[h] is the Planck constant (<>), and\n\n[stem%unnumbered]\n++++\nf(lambda,T) = (lambda^(-5))/(\"exp\"(c_2 lambda^(-1)T^(-1))-1)\n++++\n\nwhere the radiation constant stem:[c_2 = hc//k].\n\nThe integral of (total) radiance is determined by the wavelength interval stem:[(lambda_1, lambda_2)] under consideration:\n\n[stem%unnumbered]\n++++\nL_\"e\" = int_(lambda_1)^(lambda_2)L_(\"e\",lambda)(lambda)\n++++\n"@en ;
iso:urn .