SpectreSolaireGradue DVD



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English: Solar spectrum with Fraunhofer lines (taken through a DVD as diffraction grating)
Français : Spectre solaire avec raies de Fraunhofer (photo d'une fente taillée au cutter à travers un DVD prise avec un Canon Powershot A70).
Date 24 March 2011(2011-03-24)
Source Own work
Author Xofc

I am not 100% sure the scale is right. Pas sûr que l'échelle soit vraiment correcte.
(It is a screenshot of an SVG file displayed by Firefox)

The code is not perfect, but looks like this :

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg width="2200" height="512" xmlns="http://www.w3.org/2000/svg" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink" >

<g stroke="black" id="marques"></g>
<script type="text/javascript">
var SVG_NS ="http://www.w3.org/2000/svg";
var SVG_LNK = "http://www.w3.org/1999/xlink";
const pi=3.141592754
var doc=document.getElementById("marques");
// jpeg
myjpg= document.createElementNS(SVG_NS, "image");
myjpg.setAttributeNS("http://www.w3.org/1999/xlink", "xlink:href", "SpectreSolaireRedresse.jpg");
margex = 50; margey = 50;
image_height = 202; image_width = 2020;
myjpg.setAttribute("x", margex);
myjpg.setAttribute("y", margey);
myjpg.setAttribute("width", image_width);
myjpg.setAttribute("height", image_height);

<!-- ****** spectre solaire ******* -->
// Pointage des raies avec GIMP
px1=1566; lambda1=589.0; <!-- Doublet Na -->
px2=987; lambda2=518.3; <!-- Triplet Mg -->
// Parametres d'interpolation
alpha = (px1 - px2) / (lambda1 - lambda2);
beta = px1 - alpha * lambda1;

for (lambda = 300; lambda < 700; lambda += 2)
        x = Math.round(lambda * alpha + beta) + margex;
        if (x < margex)
        if (x > (image_width + margex))
        mygrad = document.createElementNS(SVG_NS, "line");
        mygrad.setAttribute("x1", x);
        mygrad.setAttribute("x2", x);
        mygrad.setAttribute("y1", margey + image_height);
        if ((lambda % 10) == 0)
                mygrad.setAttribute("y2", margey + image_height + 20);
        else    mygrad.setAttribute("y2", margey + image_height + 10);
        mygrad.setAttribute("style", "stroke:rgb(99,99,99);stroke-width:2");
        if (lambda % 10)
        mygradtxt = document.createElementNS(SVG_NS, "text");
        mygradtxt.setAttribute("x", x);
        mygradtxt.setAttribute("y", margey + image_height + 30);
        mygradtxt.setAttribute("stroke-width", "0.3");
        mygradtxt.setAttribute("style", "font-size:12px;");
        var mytext = document.createTextNode(lambda);



I, the copyright holder of this work, hereby publish it under the following licenses:
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.

w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported, 2.5 Generic, 2.0 Generic and 1.0 Generic license.
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 attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
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You may select the license of your choice.

GNU Free Documentation License


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EXIF data:
File name spectresolairegradue_dvd.jpg
Size, bytes 39673
Mime type image/jpeg
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