{"id":8470,"date":"2020-11-20T00:22:58","date_gmt":"2020-11-20T00:22:58","guid":{"rendered":"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/comprimento\/"},"modified":"2023-02-13T14:27:21","modified_gmt":"2023-02-13T14:27:21","slug":"length","status":"publish","type":"page","link":"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/length\/","title":{"rendered":"Length"},"content":{"rendered":"<p><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container hundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-sizes-top:0px;--awb-border-sizes-bottom:0px;--awb-border-sizes-left:0px;--awb-border-sizes-right:0px;--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-top:0px;--awb-padding-right:0px;--awb-padding-bottom:0px;--awb-padding-left:0px;--awb-margin-top:0px;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start\" style=\"width:104% !important;max-width:104% !important;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-padding-bottom:3%;--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-image-element \" style=\"--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-1 hover-type-none\" class=\"image-magnify\" class=\"image-scroll\"><img decoding=\"async\" width=\"2005\" height=\"265\" title=\"header_metrologia_v2_wireless_EN\" src=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/header_metrologia_v2_wireless_EN.jpg\" data-orig-src=\"https:\/\/storagewebsiteipq.blob.core.windows.net\/website\/header_metrologia_v2_wireless_EN.jpg\" alt class=\"lazyload img-responsive wp-image-7953\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%272005%27%20height%3D%27265%27%20viewBox%3D%270%200%202005%20265%27%3E%3Crect%20width%3D%272005%27%20height%3D%27265%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/header_metrologia_v2_wireless_EN-200x26.jpg 200w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/header_metrologia_v2_wireless_EN-400x53.jpg 400w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/header_metrologia_v2_wireless_EN-600x79.jpg 600w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/header_metrologia_v2_wireless_EN-800x106.jpg 800w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/header_metrologia_v2_wireless_EN-1200x159.jpg 1200w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/header_metrologia_v2_wireless_EN.jpg 2005w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 1024px) 100vw, (max-width: 640px) 100vw, 2005px\" \/><\/span><\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-2 fusion-flex-container nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start\" style=\"max-width:1420.64px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-1 fusion_builder_column_1_3 1_3 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:33.333333333333%;--awb-margin-top-large:0px;--awb-spacing-right-large:5.76%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:5.76%;--awb-width-medium:100%;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-widget fusion-widget-element fusion-widget-area fusion-content-widget-area wpWidget-1 menu_v_template1 fusion_widget_vertical_menu no-divider-color\" style=\"--awb-fusion-border-size:0px;--awb-fusion-border-style:solid;\"><div class=\"widget avada_vertical_menu\"><style>#fusion-vertical-menu-widget-avada-vertical-menu-widget-1-nav ul.menu li a {font-size:14px;}<\/style><nav id=\"fusion-vertical-menu-widget-avada-vertical-menu-widget-1-nav\" class=\"fusion-vertical-menu-widget fusion-menu hover left no-border\" aria-label=\"Secondary navigation\"><ul id=\"menu-metrology\" class=\"menu\"><li id=\"menu-item-8469\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8469\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/acceleration-vibrations\/\"><span class=\"link-text\"> Acceleration vibrations<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8650\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8650\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/breath-analyzer\/\"><span class=\"link-text\"> Breath analyzer<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8501\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8501\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/eletricity-and-magnetism\/\"><span class=\"link-text\"> Eletricity and magnetism<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8564\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8564\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/force\/\"><span class=\"link-text\"> Force<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8670\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8670\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/gas-analysers\/\"><span class=\"link-text\"> Gas analysers<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8491\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8491\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/length\/\"><span class=\"link-text\"> Length<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8653\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8653\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/mass-solid-density\/\"><span class=\"link-text\"> Mass solid density<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8656\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8656\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/photometry-radiometry-radiofrequencies\/\"><span class=\"link-text\"> Photometry radiometry radiofrequencies<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8005\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8005\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/pressure\/\"><span class=\"link-text\"> Pressure<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8047\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8047\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/properties-of-liquids\/\"><span class=\"link-text\"> Properties of liquids<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-8586\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-8586\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/reference-gas\/\"><span class=\"link-text\"> Reference gas<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-7987\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-7987\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/temperature\/\"><span class=\"link-text\"> Temperature<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-7962\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-7962\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/time-and-frequency\/\"><span class=\"link-text\"> Time and frequency<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-7963\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-7963\"><a href=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/en\/volume-and-flow\/\"><span class=\"link-text\"> Volume and flow<\/span><span class=\"arrow\"><\/span><\/a><\/li><\/ul><\/nav><\/div><\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-2 fusion_builder_column_2_3 2_3 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:66.666666666667%;--awb-margin-top-large:0px;--awb-spacing-right-large:2.88%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:2.88%;--awb-width-medium:100%;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-title title fusion-title-1 fusion-sep-none fusion-title-text fusion-title-size-two subtitulo-sh2\" style=\"--awb-text-color:#f24949;--awb-font-size:20px;\"><h2 class=\"title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;font-size:1em;--fontSize:20;--minFontSize:20;line-height:2;\"><span class=\"TextRun SCXW121106029 BCX9\" lang=\"PT-PT\" xml:lang=\"PT-PT\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW121106029 BCX9\">LENGHT<\/span><\/span><\/h2><\/div><div class=\"fusion-text fusion-text-1 template-1-text\" style=\"--awb-margin-top:20px;\"><p><span data-contrast=\"auto\"><img decoding=\"async\" class=\"lazyload alignright size-fusion-200 wp-image-8460\" src=\"https:\/\/storagewebsiteipq.blob.core.windows.net\/website\/logo-SI-Const-m_c_delta-nu-1-200x200.png\" data-orig-src=\"https:\/\/storagewebsiteipq.blob.core.windows.net\/website\/logo-SI-Const-m_c_delta-nu-1-200x200.png\" alt=\"\" width=\"200\" height=\"200\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27200%27%20height%3D%27200%27%20viewBox%3D%270%200%20200%20200%27%3E%3Crect%20width%3D%27200%27%20height%3D%27200%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-m_c_delta-nu-1-66x66.png 66w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-m_c_delta-nu-1-150x150.png 150w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-m_c_delta-nu-1-200x200.png 200w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-m_c_delta-nu-1-300x300.png 300w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-m_c_delta-nu-1-400x400.png 400w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-m_c_delta-nu-1-600x600.png 600w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-m_c_delta-nu-1-768x768.png 768w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-m_c_delta-nu-1-800x800.png 800w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-m_c_delta-nu-1-1024x1024.png 1024w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-m_c_delta-nu-1-1200x1200.png 1200w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-m_c_delta-nu-1-1536x1536.png 1536w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-SI-Const-m_c_delta-nu-1.png 2481w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 200px) 100vw, 200px\" \/>The Length Laboratory has the mission to materialize, maintain and disseminate the units of Length and\u00a0<\/span><span data-contrast=\"auto\">Plane a<\/span><span data-contrast=\"auto\">ngle, as well as the development and implementation of new methods and measurement capabilities<\/span><span data-contrast=\"auto\">.<\/span><\/p>\n<p><span data-contrast=\"auto\">In the frame of its activities has as its main concerns:<\/span><\/p>\n<ul>\n<li><span data-contrast=\"auto\">Assure the traceabili<\/span><span data-contrast=\"auto\">ty of<\/span><span data-contrast=\"auto\">Length<\/span><span data-contrast=\"auto\">units\u00a0<\/span><span data-contrast=\"auto\">(metre and radian)\u00a0<\/span><span data-contrast=\"auto\">allowing its dissemination in a national level;<\/span><span data-ccp-props=\"{\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Participate and coordinate I&amp;D projects and interlaboratory comparisons;<\/span><\/li>\n<li><span data-contrast=\"auto\">Support technically the legal metrology.<\/span><\/li>\n<\/ul>\n<\/div><div class=\"fusion-text fusion-text-2 template-1-text\"><\/div><div class=\"accordian fusion-accordian toggle-control toggle-title-control\" style=\"--awb-border-size:1px;--awb-icon-size:13px;--awb-content-font-size:var(--awb-typography4-font-size);--awb-icon-alignment:right;--awb-hover-color:#f9f9f9;--awb-border-color:#cccccc;--awb-background-color:#ffffff;--awb-divider-color:var(--awb-color3);--awb-divider-hover-color:var(--awb-color3);--awb-icon-color:#ffffff;--awb-title-color:var(--awb-color8);--awb-content-color:var(--awb-color8);--awb-icon-box-color:#f24949;--awb-toggle-hover-accent-color:#f24949;--awb-title-font-family:var(--awb-typography1-font-family);--awb-title-font-weight:var(--awb-typography1-font-weight);--awb-title-font-style:var(--awb-typography1-font-style);--awb-title-font-size:16PX;--awb-title-letter-spacing:1px;--awb-title-line-height:1.5;--awb-content-font-family:var(--awb-typography4-font-family);--awb-content-font-weight:var(--awb-typography4-font-weight);--awb-content-font-style:var(--awb-typography4-font-style);\"><div class=\"panel-group fusion-toggle-icon-right fusion-toggle-icon-boxed\" id=\"accordion-8470-1\"><div class=\"fusion-panel panel-default panel-43f432412e1f255c4 fusion-toggle-has-divider\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_43f432412e1f255c4\"><a aria-expanded=\"false\" aria-controls=\"43f432412e1f255c4\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-8470-1\" data-target=\"#43f432412e1f255c4\" href=\"#43f432412e1f255c4\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">FIELDS OF ACTIVITY<\/span><\/a><\/h4><\/div><div id=\"43f432412e1f255c4\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_43f432412e1f255c4\"><div class=\"panel-body toggle-content fusion-clearfix\">\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\">The\u00a0<\/span><span data-contrast=\"auto\">areas of activity<\/span><span data-contrast=\"auto\">\u00a0of the Length Laboratory<\/span><span data-contrast=\"auto\">,<\/span><span data-contrast=\"auto\">\u00a0are:<\/span><\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li><span data-contrast=\"auto\">Length &#8211; dissemination of the meter, through the calibration of interferometer lasers in wavelength and emission frequency and through the comparison of the indication of interferometers used in dimensional metrology;<\/span><span data-ccp-props=\"{&quot;134233279&quot;:true,&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:240}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\u2022\" data-font=\"Calibri\" data-listid=\"8\" aria-setsize=\"-1\" data-aria-posinset=\"13\" data-aria-level=\"1\"><span data-contrast=\"auto\">Plane<\/span><span data-contrast=\"auto\">\u00a0angle &#8211; dissemination of the radian, through the calibration of angle\u00a0<\/span><span data-contrast=\"auto\">standards<\/span><span data-contrast=\"auto\">: autocollimators, angular\u00a0<\/span><span data-contrast=\"auto\">gauge\u00a0<\/span><span data-contrast=\"auto\">blocks, pentaprisms, indexed and \/ or rotating tables and polygons;<\/span><span data-ccp-props=\"{&quot;134233279&quot;:true,&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:240}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\u2022\" data-font=\"Calibri\" data-listid=\"8\" aria-setsize=\"-1\" data-aria-posinset=\"13\" data-aria-level=\"1\"><span data-contrast=\"auto\">Surface<\/span><span data-contrast=\"auto\">\u00a0<\/span><span data-contrast=\"auto\">texture<\/span><span data-contrast=\"auto\">, through the calibration of roughness\u00a0<\/span><span data-contrast=\"auto\">standards<\/span><span data-contrast=\"auto\">\u00a0by profilometry;<\/span><\/li>\n<li data-leveltext=\"\u2022\" data-font=\"Calibri\" data-listid=\"8\" aria-setsize=\"-1\" data-aria-posinset=\"13\" data-aria-level=\"1\"><span data-contrast=\"auto\">Dimensional metrology, through the calibration of linear\u00a0<\/span><span data-contrast=\"auto\">gauge\u00a0<\/span><span data-contrast=\"auto\">blocks<\/span><span data-contrast=\"auto\">, scales<\/span><span data-contrast=\"auto\">\u00a0and\u00a0<\/span><span data-contrast=\"auto\">m<\/span><span data-contrast=\"auto\">aterial measures of length for general use<\/span><span data-contrast=\"auto\">;<\/span><span data-ccp-props=\"{&quot;134233279&quot;:true,&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:240}\">\u00a0<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li data-leveltext=\"\u2022\" data-font=\"Calibri\" data-listid=\"8\" aria-setsize=\"-1\" data-aria-posinset=\"13\" data-aria-level=\"1\"><span data-contrast=\"auto\">Legal metrology, through the performance of legal metrological control tests in service of material measures of length\u00a0<\/span><span data-contrast=\"auto\">for general use (<\/span><span data-contrast=\"auto\">tape measure with tensioning weight<\/span><span data-contrast=\"auto\">);<\/span><span data-ccp-props=\"{&quot;134233279&quot;:true,&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:240}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\u2022\" data-font=\"Calibri\" data-listid=\"8\" aria-setsize=\"-1\" data-aria-posinset=\"13\" data-aria-level=\"1\"><span data-contrast=\"auto\">I<\/span><span data-contrast=\"auto\">&amp;D, through participation in international projects for the development of metrology.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p style=\"padding-left: 40px;\">In development\u00a0<span data-contrast=\"auto\">stage<\/span><span data-contrast=\"auto\">:<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:240}\">\u00a0<\/span><\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li data-leveltext=\"\u2022\" data-font=\"Calibri\" data-listid=\"8\" aria-setsize=\"-1\" data-aria-posinset=\"13\" data-aria-level=\"1\"><span data-contrast=\"auto\">Form measurements<\/span><span data-contrast=\"auto\">, for the calibration of<\/span><span data-contrast=\"auto\"> roundness, cylindricity and straightness standards.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p style=\"padding-left: 40px;\">Get to know\u00a0<span data-contrast=\"auto\">here\u00a0<\/span><span data-contrast=\"auto\">ongoing projects<\/span><span data-contrast=\"auto\">.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:240}\">\u00a0<\/span><\/p>\n<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-5e075570cd8bc2301 fusion-toggle-has-divider\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_5e075570cd8bc2301\"><a aria-expanded=\"false\" aria-controls=\"5e075570cd8bc2301\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-8470-1\" data-target=\"#5e075570cd8bc2301\" href=\"#5e075570cd8bc2301\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">TRACEABILITY<\/span><\/a><\/h4><\/div><div id=\"5e075570cd8bc2301\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_5e075570cd8bc2301\"><div class=\"panel-body toggle-content fusion-clearfix\">\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\">The <\/span><b><span data-contrast=\"auto\">metre<\/span><\/b><span data-contrast=\"auto\">, symbol m, is the SI unit of length.<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\">It is defined by taking the fixed numerical value of <\/span><span data-contrast=\"auto\">the speed of light in vacuum <\/span><i><span data-contrast=\"auto\">c<\/span><\/i> <span data-contrast=\"auto\">to be 299 792 458 when expressed in the unit m\/s, where the second is defined in terms of the <\/span><span data-contrast=\"auto\">caesium<\/span><span data-contrast=\"auto\"> frequency <\/span><i><span data-contrast=\"auto\">\u0394<\/span><\/i><i><span data-contrast=\"auto\">n<\/span><\/i><i><span data-contrast=\"auto\">Cs<\/span><\/i><\/p>\n<p style=\"padding-left: 40px;\"><b><span data-contrast=\"auto\">Derived<\/span><\/b><b> <\/b><b><span data-contrast=\"auto\">Units<\/span><\/b><\/p>\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\">The<\/span> <b><span data-contrast=\"auto\">radian<\/span><\/b><span data-contrast=\"auto\">, <\/span><span data-contrast=\"auto\">symbol<\/span><span data-contrast=\"auto\"> rad, <\/span><span data-contrast=\"auto\">is the derived unit of plane angle.<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\">It <\/span><span data-contrast=\"auto\">is defined as the <\/span><span data-contrast=\"auto\">plane angle situated between two radius that, in a circumference of a circle, intersects an arc length equal to the radius of the mentioned circle.<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\">Plane angle, <\/span><span data-contrast=\"auto\">SI unit with special names and symbols <a href=\"https:\/\/storagewebsiteipq.blob.core.windows.net\/website\/Traceability_LCO.pdf\">here<\/a>.<\/span><\/p>\n<p style=\"padding-left: 40px;\"><b><span data-contrast=\"auto\">Length <\/span><\/b><\/p>\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\">At IPQ, the realization of the definition of the <\/span><span data-contrast=\"auto\">metre<\/span><span data-contrast=\"auto\"> can be performed by two different ways:<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\">1.By the <\/span><span data-contrast=\"auto\">calculation of a wavelength from a measured frequency (using speed of light in the conversion<\/span><span data-contrast=\"auto\">)<\/span><span data-contrast=\"auto\">;<\/span><\/p>\n<p style=\"padding-left: 40px;\">In this case t<span data-contrast=\"auto\">he standard is an Optical Frequency Synthesizer (OFS) constituted by: an Nb:YVO<\/span><span data-contrast=\"auto\">4<\/span><span data-contrast=\"auto\"> laser; an optical acoustic modulator, Kerr-lens mode-locked femtosecond <\/span><span data-contrast=\"auto\">Ti:sapphire<\/span><span data-contrast=\"auto\"> laser and an optical <\/span><span data-contrast=\"auto\">fibre<\/span><span data-contrast=\"auto\"> based on photonic crystals and an optical and electronic set that allows to determine the two frequencies that characterize the OFS, the offset frequency, <\/span><i><span data-contrast=\"auto\">f<\/span><\/i><span data-contrast=\"auto\">0<\/span><span data-contrast=\"auto\"> , and the repetition frequency, <\/span><i><span data-contrast=\"auto\">f<\/span><\/i><span data-contrast=\"auto\">r<\/span><span data-contrast=\"auto\">.<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\">2. Using<\/span><span data-contrast=\"auto\"> a frequency or wavelength standard selected from a list of prescribed standards<\/span><span data-contrast=\"auto\">;<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\">The practical realization is based on the relation <\/span><em>c0<\/em> <span data-contrast=\"auto\">= \u03bb<\/span><span data-contrast=\"auto\">\u00a0\u00d7 <\/span><i><span data-contrast=\"auto\">f<\/span><\/i><span data-contrast=\"auto\">, and<\/span><span data-contrast=\"auto\"> as<\/span> <span data-contrast=\"auto\">the speed of light in vacuum <\/span><i><span data-contrast=\"auto\">c<\/span><\/i><span data-contrast=\"auto\">, is a constant and <\/span><i><span data-contrast=\"auto\">f<\/span><\/i><span data-contrast=\"auto\"> (laser radiation frequency) is well determined, \u03bb <\/span><span data-contrast=\"auto\">(wavelength) can be calculated.<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\">In this <\/span><span data-contrast=\"auto\">other possibility <\/span><span data-contrast=\"auto\">the <\/span><span data-contrast=\"auto\">IPQ <\/span><span data-contrast=\"auto\">standard is an He<\/span><span data-contrast=\"auto\">&#8211;<\/span><span data-contrast=\"auto\">Ne laser <\/span><span data-contrast=\"auto\">stabilised<\/span><span data-contrast=\"auto\"> to saturated absorption in iodine<\/span><span data-contrast=\"auto\"> (IPQ3)<\/span><span data-contrast=\"auto\">. Its traceability is obtained by the calibration with the OFS.<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\">The use of this standards, or any other laser system calibrated by comparison with<\/span><span data-contrast=\"auto\"> IPQ3<\/span><span data-contrast=\"auto\">, allow the length measurements, <\/span><i><span data-contrast=\"auto\">l<\/span><\/i><i> <\/i><span data-contrast=\"auto\">, in terms of <\/span><span data-contrast=\"auto\">a number of<\/span><span data-contrast=\"auto\"> wavelengths <\/span><i><span data-contrast=\"auto\">b<\/span><\/i><span data-contrast=\"auto\">, <\/span><em>l<b> <\/b>= \u03bb x b<\/em><span data-contrast=\"auto\">, by interferometry.<\/span><\/p>\n<p style=\"padding-left: 40px;\"><b><span data-contrast=\"auto\">Plane Angle\u00a0<\/span><\/b><span data-ccp-props=\"{\">\u00a0<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\">The realization of the radian definition is made in terms of the circle subdivision.<\/span><span data-ccp-props=\"{\">\u00a0<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\">The complete circle corresponds to<\/span><span data-contrast=\"auto\">\u00a0<\/span><span data-contrast=\"auto\">2 \u03c0<\/span><span data-contrast=\"auto\">\u00a0<\/span><span data-contrast=\"auto\">rad. As<\/span><span data-contrast=\"auto\"> \u03c0 <\/span><span data-contrast=\"auto\">is an irrational number the units used in angular metrology belongs to the sexagesimal system and are the\u00a0<\/span><span data-contrast=\"auto\">degree<\/span><span data-contrast=\"auto\">\u00a0(<\/span><span data-contrast=\"auto\">\u00b0<\/span><span data-contrast=\"auto\">), minute (\u2032<\/span><span data-contrast=\"auto\">) and the second (\u2033<\/span><span data-contrast=\"auto\">). As the sum of all intermediate angles of a circle is 360<\/span><span data-contrast=\"auto\">\u00b0<\/span><span data-contrast=\"auto\">\u00a0and the sum of all errors of the same angles is zero, it is possible to produce matrixes and equations to determine the error of each intermediate angle of the circle. To make the practical realization of the radian definition, IPQ has an autocollimator (optical system used to measure small angular differences), an index table (allows the generation of angular positions) and gauge polygons. Nowadays, the traceability is reached through the calibration of the autocollimator at the<\/span><span data-contrast=\"auto\">\u00a0<\/span><span data-contrast=\"auto\">international primary laboratory.<\/span><\/p>\n<p style=\"padding-left: 40px;\"><strong><a href=\"https:\/\/www.bipm.org\/en\/publications\/mises-en-pratique\/\" target=\"_blank\" rel=\"noopener\">External document<\/a>:<\/strong><\/p>\n<p style=\"padding-left: 40px;\"><a href=\"https:\/\/www.bipm.org\/utils\/en\/pdf\/si-mep\/SI-App2-metre.pdf\" target=\"_blank\" rel=\"noopener\"><em>Mise en pratique for the definition of the metre in the SI (20 May 2019)<\/em><\/a><\/p>\n<p style=\"padding-left: 40px;\"><a href=\"https:\/\/www.bipm.org\/utils\/common\/pdf\/CC\/CCL\/CCL-GD-MeP-1.pdf\" target=\"_blank\" rel=\"noopener\"><em>Guidance document CCL-GD-MeP-1<\/em><\/a><\/p>\n<p style=\"padding-left: 40px;\"><a href=\"https:\/\/www.bipm.org\/utils\/common\/pdf\/CC\/CCL\/CCL-GD-MeP-2.pdf\" target=\"_blank\" rel=\"noopener\"><em>Guidance document CCL-GD-MeP-2<\/em><\/a><\/p>\n<p style=\"padding-left: 40px;\"><a href=\"https:\/\/www.bipm.org\/utils\/common\/pdf\/CC\/CCL\/CCL-GD-MeP-3.pdf\" target=\"_blank\" rel=\"noopener\"><em>Guidance document CCL-GD-MeP-3<\/em><\/a><\/p>\n<p style=\"padding-left: 40px;\"><em><a href=\"https:\/\/www.bipm.org\/en\/publications\/mises-en-pratique\/standard-frequencies.html\" target=\"_blank\" rel=\"noopener\">Recommended values of standard frequencies (last updated 30 November 2018)<\/a><\/em><\/p>\n<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-ac4ce9767d9f8ee45 fusion-toggle-has-divider\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_ac4ce9767d9f8ee45\"><a aria-expanded=\"false\" aria-controls=\"ac4ce9767d9f8ee45\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-8470-1\" data-target=\"#ac4ce9767d9f8ee45\" href=\"#ac4ce9767d9f8ee45\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">AVAILABLE CALIBRATION SERVICES<\/span><\/a><\/h4><\/div><div id=\"ac4ce9767d9f8ee45\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_ac4ce9767d9f8ee45\"><div class=\"panel-body toggle-content fusion-clearfix\">\n<p style=\"padding-left: 40px;\">See <a href=\"https:\/\/storagewebsiteipq.blob.core.windows.net\/website\/Services_LCO.pdf\">here<\/a> available calibration services.<\/p>\n<p style=\"padding-left: 40px;\"><b><span data-contrast=\"auto\">International Recognition<\/span><\/b><\/p>\n<p style=\"padding-left: 40px;\"><span data-contrast=\"auto\">The calibration services\u00a0<\/span><span data-contrast=\"auto\">registered as <a href=\"https:\/\/www.bipm.org\/kcdb\/cmc\/search?domain=PHYSICS&amp;areaId=2&amp;keywords=portugal\" target=\"_blank\" rel=\"noopener\">CMC<\/a> ar<\/span><span data-contrast=\"auto\">e available in the BIPM database.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:240}\">\u00a0<\/span><\/p>\n<p style=\"padding-left: 40px;\"><img decoding=\"async\" class=\"lazyload wp-image-4727 size-fusion-200 alignleft\" src=\"https:\/\/storagewebsiteipq.blob.core.windows.net\/website\/logo-CIPM-MRA-1-200x98.jpg\" data-orig-src=\"https:\/\/storagewebsiteipq.blob.core.windows.net\/website\/logo-CIPM-MRA-1-200x98.jpg\" alt=\"\" width=\"200\" height=\"98\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27200%27%20height%3D%2798%27%20viewBox%3D%270%200%20200%2098%27%3E%3Crect%20width%3D%27200%27%20height%3D%2798%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-CIPM-MRA-1-200x98.jpg 200w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-CIPM-MRA-1-300x147.jpg 300w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-CIPM-MRA-1.jpg 391w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 200px) 100vw, 200px\" \/><img decoding=\"async\" class=\"lazyload wp-image-4729 size-fusion-200 alignleft\" src=\"https:\/\/storagewebsiteipq.blob.core.windows.net\/website\/logo-KBCD-200x51.jpg\" data-orig-src=\"https:\/\/storagewebsiteipq.blob.core.windows.net\/website\/logo-KBCD-200x51.jpg\" alt=\"\" width=\"200\" height=\"51\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27200%27%20height%3D%2751%27%20viewBox%3D%270%200%20200%2051%27%3E%3Crect%20width%3D%27200%27%20height%3D%2751%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-KBCD-200x51.jpg 200w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-KBCD-300x76.jpg 300w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-KBCD-400x102.jpg 400w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-KBCD-600x153.jpg 600w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/logo-KBCD.jpg 612w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 200px) 100vw, 200px\" \/><\/p>\n<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-580d046eb35ae309d fusion-toggle-has-divider\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_580d046eb35ae309d\"><a aria-expanded=\"false\" aria-controls=\"580d046eb35ae309d\" role=\"button\" data-toggle=\"collapse\" data-parent=\"#accordion-8470-1\" data-target=\"#580d046eb35ae309d\" href=\"#580d046eb35ae309d\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">CONTACTS<\/span><\/a><\/h4><\/div><div id=\"580d046eb35ae309d\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_580d046eb35ae309d\"><div class=\"panel-body toggle-content fusion-clearfix\">\n<p style=\"padding-left: 40px;\"><strong>Fernanda Saraiva<\/strong><\/p>\n<p style=\"padding-left: 40px;\">Tel.: +351 212 948 160<\/p>\n<p style=\"padding-left: 40px;\">E-mail: <a href=\"mailto:fsaraiva@ipq.pt\">fsaraiva@ipq.pt<\/a><\/p>\n<\/div><\/div><\/div><\/div><\/div><div class=\"fusion-image-carousel fusion-image-carousel-auto fusion-image-carousel-1 fusion-carousel-border\" style=\"margin-top:30px;\"><div class=\"awb-carousel awb-swiper awb-swiper-carousel\" data-autoplay=\"yes\" data-columns=\"1\" data-itemmargin=\"13\" data-itemwidth=\"180\" data-touchscroll=\"no\" data-imagesize=\"auto\" style=\"--awb-columns:1;\"><div 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https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/DMET-LCO-108-1-400x300.jpg 400w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/DMET-LCO-108-1-600x450.jpg 600w, https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/DMET-LCO-108-1.jpg 640w\" data-sizes=\"auto\" \/><\/div><\/div><\/div><div class=\"swiper-slide\"><div class=\"fusion-carousel-item-wrapper\"><div class=\"fusion-image-wrapper hover-type-none\"><img decoding=\"async\" width=\"640\" height=\"480\" src=\"https:\/\/ipqqa.westeurope.cloudapp.azure.com\/wp-content\/uploads\/DMET-LCO-107-1.jpg\" class=\"attachment-full size-full lazyload\" alt=\"\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27640%27%20height%3D%27480%27%20viewBox%3D%270%200%20640%20480%27%3E%3Crect%20width%3D%27640%27%20height%3D%27480%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" 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