{"id":3301,"date":"2023-05-02T06:36:57","date_gmt":"2023-05-02T06:36:57","guid":{"rendered":"https:\/\/thermibel.be\/faq\/hoe-kunnen-we-spanning-omzetten-in-temperatuur\/"},"modified":"2023-06-29T08:50:37","modified_gmt":"2023-06-29T08:50:37","slug":"hoe-kunnen-we-spanning-omzetten-in-temperatuur","status":"publish","type":"faq","link":"https:\/\/thermibel.be\/nl\/faq\/hoe-kunnen-we-spanning-omzetten-in-temperatuur\/","title":{"rendered":"Hoe kunnen we spanning omzetten in temperatuur?"},"content":{"rendered":"\n<p>Nu we gebruiken hebben gemaakt van de softwarecompensatie of de materi\u00eble compensatie om een referentieovergang op 0\u00b0C te krijgen, moeten we de gemeten spanning V omzetten in temperatuur.<\/p>\n\n\n\n<p>Jammer genoeg is het verband tussen de spanning en temperatuur van thermokoppels <u>niet lineair.<\/u><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"450\" height=\"348\" src=\"https:\/\/thermibel.be\/app\/uploads\/2023\/05\/faq-16.1.png\" alt=\"Figuur 4. Spanning van thermokoppels in functie van de temperatuur\" class=\"wp-image-264\" srcset=\"https:\/\/thermibel.be\/app\/uploads\/2023\/05\/faq-16.1.png 450w, https:\/\/thermibel.be\/app\/uploads\/2023\/05\/faq-16.1-300x232.png 300w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/figure>\n<\/div>\n\n\n<p class=\"has-text-align-center leg\">Figuur 4. Spanning van thermokoppels in functie van de temperatuur<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Type<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Metaal A (+)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Metaal B (-)<\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">E<\/td><td class=\"has-text-align-center\" data-align=\"center\">Chromel<\/td><td class=\"has-text-align-center\" data-align=\"center\">Constantaan<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">J<\/td><td class=\"has-text-align-center\" data-align=\"center\">IJzer<\/td><td class=\"has-text-align-center\" data-align=\"center\">Constantaan<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">K<\/td><td class=\"has-text-align-center\" data-align=\"center\">Chromel<\/td><td class=\"has-text-align-center\" data-align=\"center\">Alumel<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">R<\/td><td class=\"has-text-align-center\" data-align=\"center\">Platina<\/td><td class=\"has-text-align-center\" data-align=\"center\">Platina<br>13% Rodium<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">S<\/td><td class=\"has-text-align-center\" data-align=\"center\">Platina<\/td><td class=\"has-text-align-center\" data-align=\"center\">Platina<br>10% Rodium<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">T<\/td><td class=\"has-text-align-center\" data-align=\"center\">Koper<\/td><td class=\"has-text-align-center\" data-align=\"center\">Constantaan<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Om deze niet-lineariteit beter weer te geven moeten we de <strong>Seebeck-co\u00ebffici\u00ebnt bekijken in functie van de temperatuur:<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"450\" height=\"456\" src=\"https:\/\/thermibel.be\/app\/uploads\/2023\/05\/faq-16.2.png\" alt=\"Figuur 5. Seebeck-co\u00ebffici\u00ebnt afhankelijk van de temperatuur voor verschillende types thermokoppels\" class=\"wp-image-266\" srcset=\"https:\/\/thermibel.be\/app\/uploads\/2023\/05\/faq-16.2.png 450w, https:\/\/thermibel.be\/app\/uploads\/2023\/05\/faq-16.2-300x304.png 300w, https:\/\/thermibel.be\/app\/uploads\/2023\/05\/faq-16.2-100x100.png 100w, https:\/\/thermibel.be\/app\/uploads\/2023\/05\/faq-16.2-296x300.png 296w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/figure>\n<\/div>\n\n\n<p class=\"has-text-align-center leg\">Figuur 5. Seebeck-co\u00ebffici\u00ebnt afhankelijk van de temperatuur voor verschillende types thermokoppels<\/p>\n\n\n\n<p>We merken op dat het thermokoppel van het type K een bijna lineair deel vertoont tussen 0\u00b0C en 1000\u00b0C met een Seebeck-co\u00ebffici\u00ebnt \u03b1 die schommelt rond 40 \u00b5V\/\u00b0C. Op die manier kan dit type van thermokoppels rechtstreeks worden ge\u00ebxploiteerd met een multiplier voltmeter en een referentie van 0\u00b0C om de temperatuur met een gemiddelde precisie weer te geven. <\/p>\n\n\n\n<p><strong>Berekening op basis van tabellen<\/strong><\/p>\n\n\n\n<p>Nadat we de waarde van de spanning V, bijvoorbeeld 8,35687 mV, hebben afgelezen met behulp van een Thermokoppel van het type K (Chrome\/Alumel), kunnen we in de tabel ITS-90 kijken:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\" colspan=\"12\">T<strong>abel ITS-90 voor Thermokoppel van het Type K<br>Thermo-elektrische spanning in mV<\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u00b0C<\/td><td class=\"has-text-align-center\" data-align=\"center\">0<\/td><td class=\"has-text-align-center\" data-align=\"center\">1<\/td><td class=\"has-text-align-center\" data-align=\"center\">2<\/td><td class=\"has-text-align-center\" data-align=\"center\">3<\/td><td class=\"has-text-align-center\" data-align=\"center\">4<\/td><td class=\"has-text-align-center\" data-align=\"center\">5<\/td><td class=\"has-text-align-center\" data-align=\"center\">6<\/td><td class=\"has-text-align-center\" data-align=\"center\">7<\/td><td class=\"has-text-align-center\" data-align=\"center\">8<\/td><td class=\"has-text-align-center\" data-align=\"center\">9<\/td><td class=\"has-text-align-center\" data-align=\"center\">10<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">190<\/td><td class=\"has-text-align-center\" data-align=\"center\">7.739<\/td><td class=\"has-text-align-center\" data-align=\"center\">7.779<\/td><td class=\"has-text-align-center\" data-align=\"center\">7.819<\/td><td class=\"has-text-align-center\" data-align=\"center\">7.859<\/td><td class=\"has-text-align-center\" data-align=\"center\">7.899<\/td><td class=\"has-text-align-center\" data-align=\"center\">7.939<\/td><td class=\"has-text-align-center\" data-align=\"center\">7.979<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.019<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.059<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.099<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.138<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">200<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.138<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.178<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.218<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.258<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.298<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.338<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.378<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.418<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.458<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.499<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.539<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">210<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.539<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.579<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.619<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.659<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.699<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.739<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.779<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.819<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.860<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.900<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.940<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>We kunnen zien dat deze waarde zich bevindt tussen Tinf 205\u00b0C (8,338 mV) en Tsup 206 \u00b0C (8,378 mV). Laten we een berekening uitvoeren door interpolatie tussen de waarden 205 en 206 \u00b0C: <\/p>\n\n\n\n<p>8,35687 &#8211; 8,338 = 0,01887 mV(Overschot van spanning boven 205 \u00b0C)<br><br>8,378 &#8211; 8,338 = 0,040 mV voor een verschil van 1 \u00b0C<br><br>0,01887 \/ 0,040 = 0,471 \u00b0C meer<br><br>De temperatuur bedraagt dus 205 + 0,471 = <strong>205,471 \u00b0C<\/strong><br><br>Samengevat is de berekening:<\/p>\n\n\n\n<p>= 205 + [(8,35687 &#8211; 8,338) \/ (8,378 &#8211; 8,338)] = 205,471 \u00b0C<br><br>Ofwel:<br>$$ T\\left( {^\\circ C} \\right) = {T_{inf}}\\left( {^\\circ C} \\right) + \\frac{{V &#8211; {V_{inf}}}}{{{V_{sup}} &#8211; {V_{inf}}}} $$<\/p>\n\n\n\n<p><strong>Berekening door middel van een polynomiale vergelijking<\/strong><\/p>\n\n\n\n<p>Het is mogelijk om de temperatuur te berekenen op basis van de thermo-elektrische spanning door beroep te doen op een polynomiale vergelijking:<br>$$ {T_{90}} = {c_0} + {c_1}V + {c_2}{V^2} + \\cdots + {c_n}{V^n} $$<\/p>\n\n\n\n<p>T90 = Temperatuur in \u00b0C<\/p>\n\n\n\n<p>V = Thermo-elektrische spanning in mV<\/p>\n\n\n\n<p>c = polynomiale co\u00ebffici\u00ebnten<\/p>\n\n\n\n<p>n = Maximale orde van de polynomiale vergelijking<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\" colspan=\"4\"><strong>Voorbeeld van co\u00ebffici\u00ebnten voor thermokoppels van het type K<\/strong><strong><\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Temperatuur (\u00b0C)<\/td><td class=\"has-text-align-center\" data-align=\"center\">-200 tot 0<\/td><td class=\"has-text-align-center\" data-align=\"center\">0 tot 500<\/td><td class=\"has-text-align-center\" data-align=\"center\">500 tot 1372<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Spanning (mV)<\/td><td class=\"has-text-align-center\" data-align=\"center\">-5.891 tot 0.000<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.000 tot 20644<\/td><td class=\"has-text-align-center\" data-align=\"center\">20.644 tot 54886<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">c<sub>0<\/sub><\/td><td class=\"has-text-align-center\" data-align=\"center\">0<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.000000E+00<\/td><td class=\"has-text-align-center\" data-align=\"center\">-1.318058E+02<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">c<sub>1<\/sub><\/td><td class=\"has-text-align-center\" data-align=\"center\">2.5173462E+01<\/td><td class=\"has-text-align-center\" data-align=\"center\">2.508355E+01<\/td><td class=\"has-text-align-center\" data-align=\"center\">4.830222E+01<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">c<sub>2<\/sub><\/td><td class=\"has-text-align-center\" data-align=\"center\">-1.1662878E+00<\/td><td class=\"has-text-align-center\" data-align=\"center\">7.860106E-02<\/td><td class=\"has-text-align-center\" data-align=\"center\">-1.646031E+00<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">c<sub>3<\/sub><\/td><td class=\"has-text-align-center\" data-align=\"center\">-1.0833638E+00<\/td><td class=\"has-text-align-center\" data-align=\"center\">-2.503131E-01<\/td><td class=\"has-text-align-center\" data-align=\"center\">5.464731E-02<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">c<sub>4<\/sub><\/td><td class=\"has-text-align-center\" data-align=\"center\">-8.9773540E-01<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.315270E-02<\/td><td class=\"has-text-align-center\" data-align=\"center\">-9.650715E-04<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">c<sub>5<\/sub><\/td><td class=\"has-text-align-center\" data-align=\"center\">-3.7342377E-01<\/td><td class=\"has-text-align-center\" data-align=\"center\">-1.228034E-02<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.802193E-06<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">c<sub>6<\/sub><\/td><td class=\"has-text-align-center\" data-align=\"center\">-8.6632643E-02<\/td><td class=\"has-text-align-center\" data-align=\"center\">9.804036E-04<\/td><td class=\"has-text-align-center\" data-align=\"center\">-3.110810E-08<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">c<sub>7<\/sub><\/td><td class=\"has-text-align-center\" data-align=\"center\">-1.0450598E-02<\/td><td class=\"has-text-align-center\" data-align=\"center\">-4.413030E-05<\/td><td class=\"has-text-align-center\" data-align=\"center\">0<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">c<sub>8<\/sub><\/td><td class=\"has-text-align-center\" data-align=\"center\">-5.1920577E-04<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.057734E-06<\/td><td class=\"has-text-align-center\" data-align=\"center\">0<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">c<sub>9<\/sub><\/td><td class=\"has-text-align-center\" data-align=\"center\">0<\/td><td class=\"has-text-align-center\" data-align=\"center\">-1.052755E-08<\/td><td class=\"has-text-align-center\" data-align=\"center\">0<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Afwijking (\u00b0C)<\/td><td class=\"has-text-align-center\" data-align=\"center\">-0,02 tot 0,04<\/td><td class=\"has-text-align-center\" data-align=\"center\">-0,05 tot 0,04<\/td><td class=\"has-text-align-center\" data-align=\"center\">-0,05 tot 0,06<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\" colspan=\"4\">De co\u00ebffici\u00ebnten van andere types van thermokoppels worden vermeld aan het einde van de tabellen ITS-90 in de bijlagen<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"featured_media":0,"template":"","format":"standard","class_list":["post-3301","faq","type-faq","status-publish","format-standard","hentry"],"acf":[],"aioseo_notices":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hoe kunnen we spanning omzetten in temperatuur? - Thermibel<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thermibel.be\/nl\/faq\/hoe-kunnen-we-spanning-omzetten-in-temperatuur\/\" \/>\n<meta property=\"og:locale\" content=\"nl_NL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hoe kunnen we spanning omzetten in temperatuur? - Thermibel\" \/>\n<meta property=\"og:description\" content=\"Nu we gebruiken hebben gemaakt van de softwarecompensatie of 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Jammer genoeg is het verband tussen de spanning en temperatuur van thermokoppels niet lineair. Figuur 4. Spanning van thermokoppels in functie van de temperatuur Type Metaal A [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/thermibel.be\/nl\/faq\/hoe-kunnen-we-spanning-omzetten-in-temperatuur\/\" \/>\n<meta property=\"og:site_name\" content=\"Thermibel\" \/>\n<meta property=\"article:modified_time\" content=\"2023-06-29T08:50:37+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/thermibel.be\/app\/uploads\/2023\/05\/faq-16.1.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Geschatte leestijd\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/thermibel.be\\\/nl\\\/faq\\\/hoe-kunnen-we-spanning-omzetten-in-temperatuur\\\/\",\"url\":\"https:\\\/\\\/thermibel.be\\\/nl\\\/faq\\\/hoe-kunnen-we-spanning-omzetten-in-temperatuur\\\/\",\"name\":\"Hoe kunnen we spanning omzetten in temperatuur? - Thermibel\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/thermibel.be\\\/nl\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/thermibel.be\\\/nl\\\/faq\\\/hoe-kunnen-we-spanning-omzetten-in-temperatuur\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/thermibel.be\\\/nl\\\/faq\\\/hoe-kunnen-we-spanning-omzetten-in-temperatuur\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/thermibel.be\\\/app\\\/uploads\\\/2023\\\/05\\\/faq-16.1.png\",\"datePublished\":\"2023-05-02T06:36:57+00:00\",\"dateModified\":\"2023-06-29T08:50:37+00:00\",\"inLanguage\":\"nl-NL\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/thermibel.be\\\/nl\\\/faq\\\/hoe-kunnen-we-spanning-omzetten-in-temperatuur\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"nl-NL\",\"@id\":\"https:\\\/\\\/thermibel.be\\\/nl\\\/faq\\\/hoe-kunnen-we-spanning-omzetten-in-temperatuur\\\/#primaryimage\",\"url\":\"https:\\\/\\\/thermibel.be\\\/app\\\/uploads\\\/2023\\\/05\\\/faq-16.1.png\",\"contentUrl\":\"https:\\\/\\\/thermibel.be\\\/app\\\/uploads\\\/2023\\\/05\\\/faq-16.1.png\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/thermibel.be\\\/nl\\\/#website\",\"url\":\"https:\\\/\\\/thermibel.be\\\/nl\\\/\",\"name\":\"Thermibel\",\"description\":\"Un Haut Degr\u00e9 de Qualit\u00e9\",\"publisher\":{\"@id\":\"https:\\\/\\\/thermibel.be\\\/nl\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/thermibel.be\\\/nl\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"nl-NL\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/thermibel.be\\\/nl\\\/#organization\",\"name\":\"Thermibel\",\"url\":\"https:\\\/\\\/thermibel.be\\\/nl\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"nl-NL\",\"@id\":\"https:\\\/\\\/thermibel.be\\\/nl\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/thermibel.be\\\/app\\\/uploads\\\/2023\\\/05\\\/Group-48095676.png\",\"contentUrl\":\"https:\\\/\\\/thermibel.be\\\/app\\\/uploads\\\/2023\\\/05\\\/Group-48095676.png\",\"width\":250,\"height\":59,\"caption\":\"Thermibel\"},\"image\":{\"@id\":\"https:\\\/\\\/thermibel.be\\\/nl\\\/#\\\/schema\\\/logo\\\/image\\\/\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Hoe kunnen we spanning omzetten in temperatuur? - Thermibel","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/thermibel.be\/nl\/faq\/hoe-kunnen-we-spanning-omzetten-in-temperatuur\/","og_locale":"nl_NL","og_type":"article","og_title":"Hoe kunnen we spanning omzetten in temperatuur? - Thermibel","og_description":"Nu we gebruiken hebben gemaakt van de softwarecompensatie of de materi\u00eble compensatie om een referentieovergang op 0\u00b0C te krijgen, moeten we de gemeten spanning V omzetten in temperatuur. Jammer genoeg is het verband tussen de spanning en temperatuur van thermokoppels niet lineair. Figuur 4. 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