File:BlackbodySpectrum loglog en.svg

set terminal svg size 1600,1160 fname 'Verdana' fsize 34 lw 3
set output 'BlackbodySpectrum loglog.svg'

set multiplot

# the visible light plot
set pm3d map
set palette color

set xrange [0.380:0.780]
set yrange [*:*]
set noxtics
set noborder
unset ztics
unset ytics
set samples 50
set noborder

unset colorbox
set nokey

set logscale x

# # full saturation
# set palette defined ( \
# 	0.00 0.000 0.000 0.000, \
# 	0.08 0.285 0.000 0.547, \
# 	0.20 0.148 0.016 0.918, \
# 	0.30 0.004 0.578 0.887, \
# 	0.36 0.000 0.844 0.531, \
# 	0.50 0.004 0.715 0.000, \
# 	0.68 0.863 0.797 0.000, \
# 	0.77 0.996 0.371 0.000, \
# 	0.84 0.918 0.148 0.000, \
# 	0.90 0.781 0.047 0.000, \
# 	1.00 0.000 0.000 0.000 )

set palette defined ( \
	0.00 0.8000 0.8000 0.8000, \
	0.08 0.8570 0.8000 0.9094, \
	0.20 0.8296 0.8032 0.9836, \
	0.30 0.8008 0.9156 0.9774, \
	0.36 0.8000 0.9688 0.9062, \
	0.50 0.8008 0.9430 0.8000, \
	0.68 0.9726 0.9594 0.8000, \
	0.77 0.9992 0.8742 0.8000, \
	0.84 0.9836 0.8296 0.8000, \
	0.90 0.9562 0.8094 0.8000, \
	1.00 0.8000 0.8000 0.8000 )

# l/r-margin = 0.107+(1+log(lambda))/3 * (0.858 - 0.107)

set lmargin at screen 0.252
set rmargin at screen 0.330
set bmargin at screen 0.132
set tmargin at screen 0.876

splot x

reset

# the diagrams
set lmargin at screen 0.107
set rmargin at screen 0.858
set bmargin at screen 0.132
set tmargin at screen 0.876

//# # English
//set title "Black body spectrum" font ",44"
//set xlabel "Wavelength [µm]"
//set ylabel "Spectral radiant emittance [W/(m² µm)]"
//set y2label "Spectral radiance [W/(m² µm sr)]"


# Turkish
set title "Kara Cisim Spektrumu" font ",44"
set xlabel "Dalga Boyu [µm]"
set ylabel "Spektral Işınım Emisyonu [W/(m² µm)]"
set y2label "Spektral Işınım [W/(m² µm sr)]"

# # German
# set title "Plancksches Strahlungsspektrum" font ",44"
# set xlabel "Wellenlänge [µm]"
# set ylabel "Spektrale spezifische Ausstrahlung [W/(m² µm)]"
# set y2label "Spektrale Strahldichte [W/(m² µm sr)]"


set xrange [0.1:100]
set yrange [0.01:10**10]
set y2range [0.01 / pi:10**10 / pi]

set format y "10^{%L}"
set format y2 "10^{%L}"

set logscale x
set logscale y
set logscale y2

set ytics nomirror

set grid

set nokey


k = 1.38064852 * 10**-23
h = 6.62607004 * 10**-34
c = 299792458

raw_f(lambda, T) = (2 * pi * h * c**2) / (lambda**5 * (exp((h * c) / (lambda * k * T)) - 1))
use_f(lambda, T) = raw_f(lambda / 10**6, T) / 10**6

set y2tics

set label 1 at 25, 0.04 '200K' center rotate by 0 front
set label 2 at 6.4, 4 '400K' center rotate by 0 front textcolor rgb '#FF0000'
set label 3 at 3.8, 50 '600K' center rotate by 0 front
set label 4 at 1.95, 1500 '3000K' center rotate by 0 front
set label 5 at 0.68, 400000 '6000K' center rotate by 0 front
set label 6 at 0.36, 10000000 '8000K' center rotate by 0 front textcolor rgb '#FFBB05'
set label 7 at 0.22, 180000000 '10000K' center rotate by 0 front

plot \
	use_f(x, 200) lc black lw 1, \
	use_f(x, 400) lc rgb '#FF0000' lw 2, \
	use_f(x, 600) lc black lw 1, \
	use_f(x, 3000) lc black lw 1, \
	use_f(x, 8000) lc black lw 1, \
	use_f(x, 5777) lc rgb '#FFBB05' lw 2, \
	use_f(x, 10000) lc black lw 1