File:Lumière par photon.svg
Original file (SVG file, nominally 640 × 480 pixels, file size: 12 KB)
Captions
Captions
Summary
[edit]| Description |
English: Quantity of light carried by one photon, in attolumen-seconds (10−18 lm⋅s), as a function of wavelength. Français : Quantité de lumière transportée par un photon, en attolumen-secondes (10−18 lm⋅s), en fonction de sa longueur d'onde. |
| Date | |
| Source | Own work |
| Author | Edgar Bonet |
The quantity of light per photon is computed as
- Qv = 683 lm/W × y̅(λ) × E(λ)
where y̅(λ) is the CIE “y-bar” color matching function and
- E(λ) = h × c / λ
is the energy carried by one photon.
Gnuplot source
[edit]
Warning: This source contains the following non-ASCII characters: U+03BB (greek small letter lambda, in xlabel) and U+22C5 (dot operator, in ylabel), plus some more in the comments (in French).
Attention: Ce fichier source contient les caractères non-ASCII suivants : U+03BB (lettre grecque lambda minuscule, dans xlabel) et U+22C5 (opérator point, dans ylabel), plus d'autres dans les commentaires.
#!/usr/bin/gnuplot
# Quantité de lumière transportée par un photon, en attolumen-secondes
# (10⁻¹⁸ lm⋅s), en fonction de sa longueur d'onde.
#
# Le fichier 'xyz.tsv' contient les fonctions colorimétriques CIE 1931.
# Ces données sont téléchargeables, au format Excel, à
# http://www.cie.co.at/index.php/LEFTMENUE/index.php?i_ca_id=298
h = 6.62606957e-34 # J⋅s
c = 299792458.0 # m/s
nano = 1e-9
atto = 1e-18
E(lambda) = h * c / lambda
Q_v(lambda, y_bar) = 683.0 * y_bar * E(lambda)
set term svg size 640, 480 enhanced
set output "Lumière_par_photon.svg"
set title "Quantité de lumière par photon"
set xlabel "λ (nm)"
set xrange [350:750]
set ylabel "Q_v (alm⋅s)"
set grid linetype 1 linecolor rgbcolor "#cccccc"
unset key
set style data lines
set style line 1 linewidth 2 linecolor rgbcolor "#ff0000"
plot 'xyz.tsv' using 1:(Q_v($1*nano, $3)/atto) linestyle 1
Licensing
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- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:20, 19 March 2014 | | 640 × 480 (12 KB) | Edgar.bonet (talk | contribs) | User created page with UploadWizard |
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- Usage on fr.wikipedia.org
