{"id":20717,"date":"2026-07-07T15:51:17","date_gmt":"2026-07-07T13:51:17","guid":{"rendered":"https:\/\/roder.it\/inspection\/dimension-and-geometry\/non-contact-diameter-and-ovality-measurement\/"},"modified":"2026-09-24T13:00:30","modified_gmt":"2026-09-24T11:00:30","slug":"non-contact-diameter-and-ovality-measurement","status":"publish","type":"page","link":"https:\/\/roder.it\/en\/inspection\/dimension-and-geometry\/non-contact-diameter-and-ovality-measurement\/","title":{"rendered":"Non-contact diameter and ovality measurement"},"content":{"rendered":"\n<div class=\"wp-block-group is-layout-constrained wp-container-core-group-is-layout-61d584a3 wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-ba02fbf7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:40%\">\n<figure class=\"wp-block-image size-large has-custom-border\"><img decoding=\"async\" src=\"https:\/\/roder.it\/wp-content\/uploads\/2020\/01\/ldm_41_42_series_laser_distance_meters_industrial_applications_masterimage.png\" alt=\"Non-contact diameter and ovality measurement\" style=\"border-width:1px;border-top-left-radius:20px;border-top-right-radius:20px;border-bottom-left-radius:20px;border-bottom-right-radius:20px\"\/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:60%\">\n<p class=\"has-text-color has-background wp-block-paragraph\" style=\"border-radius:0px 6px 6px 0px;border-left-color:var(--wp--preset--color--ti-accent);border-left-style:solid;border-left-width:5px;color:#1A5276;background-color:#ebf1f4;padding-top:14px;padding-right:16px;padding-bottom:14px;padding-left:16px;font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.769), 20px);font-style:italic\"><strong>Non-contact diameter and ovality measurement<\/strong> inspects round products, such as tubes, bars, cables and coils, on the production line, without touching them and without stopping the process, using optical and LASER technologies.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list is-style-checkbox has-ti-accent-color has-text-color has-link-color wp-elements-1\">\n<li><strong>Non-contact:<\/strong> measurement on a moving product<\/li>\n\n\n\n<li><strong>Round products:<\/strong> tubes, bars, cables, coils<\/li>\n\n\n\n<li><strong>Diameter and ovality:<\/strong> form inspection<\/li>\n\n\n\n<li><strong>In-line:<\/strong> during production<\/li>\n\n\n\n<li><strong>High rate:<\/strong> many measurements per second<\/li>\n\n\n\n<li><strong>No wear:<\/strong> no parts in contact<\/li>\n\n\n\n<li><strong>Process control:<\/strong> real-time correction<\/li>\n\n\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n\n<div style=\"height:24px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<p class=\"wp-block-paragraph\">Products with a circular section, such as tubes, drawn bars, wires, cables and coils, require inspection of the <strong>diameter<\/strong> and of its consistency around the circumference (<strong>ovality<\/strong>). Doing this by contact on a product in motion is impractical: non-contact optical measurement solves the problem by measuring the dimension while the product runs past. <\/p>\n\n<p class=\"wp-block-paragraph\">The measurement is <strong>continuous and free of wear<\/strong>, makes it possible to detect dimensional drift immediately and to correct the process in real time, reducing scrap.<\/p>\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<div class=\"wp-block-cover is-light popmake-11245\" style=\"border-width:1px;border-top-left-radius:10px;border-top-right-radius:10px;border-bottom-left-radius:10px;border-bottom-right-radius:10px;min-height:250px;aspect-ratio:unset;\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"213\" class=\"wp-block-cover__image-background wp-image-14896 size-large\" alt=\"banner aiuto nella scelta dello strumento oppure della tecnologia\" src=\"https:\/\/roder.it\/wp-content\/uploads\/2026\/06\/banner_technical_support_choose_products-1024x213.png\" data-object-fit=\"cover\" srcset=\"https:\/\/roder.it\/wp-content\/uploads\/2026\/06\/banner_technical_support_choose_products-1024x213.png 1024w, https:\/\/roder.it\/wp-content\/uploads\/2026\/06\/banner_technical_support_choose_products-300x63.png 300w, https:\/\/roder.it\/wp-content\/uploads\/2026\/06\/banner_technical_support_choose_products-768x160.png 768w, https:\/\/roder.it\/wp-content\/uploads\/2026\/06\/banner_technical_support_choose_products.png 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim\" style=\"background-color:#d3d6dc\"><\/span><div class=\"wp-block-cover__inner-container is-layout-constrained wp-container-core-cover-is-layout-a304f9a9 wp-block-cover-is-layout-constrained\">\n<p class=\"has-text-align-right has-ti-fg-color has-text-color has-link-color wp-elements-2 wp-block-paragraph\" style=\"font-size:clamp(21.536px, 1.346rem + ((1vw - 3.2px) * 1.726), 35px);\"><strong>Would you like help choosing the right product ?<\/strong><\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-right is-layout-flex wp-container-core-buttons-is-layout-b507c051 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/roder.it\/en\/contacts\/\">Click here !<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<h2 id=\"principio\" class=\"wp-block-heading has-ti-accent-color has-text-color\">How diameter is measured without contact<\/h2>\n\n<p class=\"wp-block-paragraph\">Optical diameter measurement uses light sources (LASER or collimated light) and detectors that sense the shadow or the profile of the product: the diameter is derived from the size of the shaded area. By using several measuring axes around the product, <strong>ovality<\/strong> is also evaluated, that is the difference between the diameters measured in different directions. <\/p>\n\n<p class=\"wp-block-paragraph\">For measuring the position, distance and clearance of large cylinders and coils, <strong>LASER distance sensors<\/strong> are used instead: they detect the distance from the surface without contact and derive the diameter or the position from it.<\/p>\n\n<h2 id=\"grandezze\" class=\"wp-block-heading has-ti-accent-color has-text-color\">Diameter and ovality<\/h2>\n\n<ul class=\"wp-block-list is-style-checkbox has-ti-accent-color has-text-color has-link-color wp-elements-3\">\n<li><strong>Diameter<\/strong>: nominal dimension of the round product.<\/li>\n\n<li><strong>Ovality<\/strong>: deviation from the circular shape, critical on tubes and cables.<\/li>\n\n<li><strong>Consistency along the length<\/strong>: detection of necking and swelling.<\/li>\n\n<li><strong>Position and clearance<\/strong> of coils and large rolls in motion.<\/li>\n<\/ul>\n\n<h2 id=\"vantaggi\" class=\"wp-block-heading has-ti-accent-color has-text-color\">Why in-line and without contact<\/h2>\n\n<p class=\"wp-block-paragraph\">In-line, non-contact measurement allows <strong>100% inspection<\/strong> of production, without slowing down the process or wearing out the instruments. The data feed process control: a diameter out of tolerance is reported immediately and can trigger automatic correction of the machine or rejection of the defective length. <\/p>\n\n<h2 id=\"strumenti\" class=\"wp-block-heading has-ti-accent-color has-text-color\">RODER instruments<\/h2>\n\n<p class=\"wp-block-paragraph\">For measuring the distance, position and clearance of round products and coils, the <strong>industrial LASER distance sensors<\/strong> distributed by RODER offer high rate non-contact measurement and integration into automation. You will find the models on the linked catalog pages. <\/p>\n\n<h2 id=\"prodotti-collegati\" class=\"wp-block-heading has-ti-accent-color has-text-color\">Related products<\/h2>\n\n<p class=\"wp-block-paragraph\">RODER instruments for this topic. Go to the catalogue pages for models, technical data and documentation. <\/p>\n\n<div class=\"wp-block-group is-layout-grid wp-container-core-group-is-layout-b251d530 wp-block-group-is-layout-grid\">\n<div class=\"wp-block-group has-border-color has-white-background-color has-background is-layout-constrained wp-container-core-group-is-layout-10ff9433 wp-block-group-is-layout-constrained\" style=\"border-color:#e0e0e0;border-width:1px;border-radius:8px;padding:16px\">\n<figure class=\"wp-block-image size-large has-custom-border\"><a href=\"https:\/\/roder.it\/en\/products\/industrial-laser-distance-sensors\/\"><img decoding=\"async\" src=\"https:\/\/roder.it\/wp-content\/uploads\/2020\/01\/ldm_41_42_series_laser_distance_meters_industrial_applications_masterimage.png\" alt=\"Industrial LASER distance sensors\" style=\"border-radius:6px;aspect-ratio:4\/3;object-fit:contain\"\/><\/a><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.385), 17px);\"><a href=\"https:\/\/roder.it\/en\/products\/industrial-laser-distance-sensors\/\">Industrial LASER distance sensors<\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:14px\">LDM LASER distance sensors for non-contact distance, position and level measurement.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-custom-font-size wp-element-button\" href=\"https:\/\/roder.it\/en\/products\/industrial-laser-distance-sensors\/\" style=\"font-size:14px\">Browse the catalogue<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n<h2 id=\"faq\" class=\"wp-block-heading has-ti-accent-color has-text-color\">Frequently asked questions<\/h2>\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\"><strong class=\"schema-faq-question\">How is diameter measured without contact?<\/strong><p class=\"schema-faq-answer\">With optical systems that sense the shadow or the profile of the product, or with LASER distance sensors that measure the distance from the surface.<\/p><\/div><div class=\"schema-faq-section\"><strong class=\"schema-faq-question\">What is ovality?<\/strong><p class=\"schema-faq-answer\">It is the deviation from the circular shape, evaluated by comparing the diameters measured in different directions.<\/p><\/div><div class=\"schema-faq-section\"><strong class=\"schema-faq-question\">Why measure in-line?<\/strong><p class=\"schema-faq-answer\">To inspect 100% of production without stopping the process and to correct dimensional drift immediately.<\/p><\/div><div class=\"schema-faq-section\"><strong class=\"schema-faq-question\">Are there parts subject to wear?<\/strong><p class=\"schema-faq-answer\">No: non-contact measurement has no elements touching the product, so it does not wear out.<\/p><\/div><\/div>\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h4 class=\"wp-block-heading has-ti-accent-color has-text-color has-link-color wp-elements-4\">Contacts &amp; Information<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Contact for general information : <a href=\"mailto:info@roder.it\">info@roder.it<\/a><br\/><br\/>Machine Vision Division of RODER : <a href=\"https:\/\/www.visiotronix.com\">www.visiotronix.com<\/a><br\/>RODER Instruments Division : <a href=\"https:\/\/www.visiotronix.com\">www.innovacheck.com<\/a><br\/>More about RODER : <a href=\"https:\/\/roder.it\/en\/contacts\/\">about us<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The information contained in this website is provided for information purposes only. Although it has been prepared with the greatest care, it does not constitute a contractual offer or a binding commitment to supply. It may contain transcription, translation or typographical errors. For precise and up-to-date information, please contact our company directly.   <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Note:<\/strong> Some images on this website have been intentionally generated using artificial intelligence (AI). This is because, for many applications and projects, photographs of the actual installation or system cannot be disclosed owing to confidentiality agreements, contractual clauses and non-disclosure agreements (NDAs). <\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Non-contact diameter and ovality measurement inspects round products, such as tubes, bars, cables and coils, on the production line, without touching them and without stopping the process, using optical and LASER technologies. Products with a circular section, such as tubes, drawn bars, wires, cables and coils, require inspection of the diameter and of its consistency [&hellip;]<\/p>\n","protected":false},"author":157040980,"featured_media":0,"parent":19240,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_wpcom_ai_launchpad_about_page":false,"_wpcom_ai_launchpad_gallery_page":false,"_wpcom_ai_launchpad_contact_page":false,"_wpcom_ai_launchpad_events_page":false,"_wpcom_ai_launchpad_video_page":false,"_wpcom_ai_launchpad_portfolio_piece":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"footnotes":""},"class_list":["post-20717","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Non-contact diameter and ovality measurement - RODER SRL<\/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:\/\/roder.it\/en\/inspection\/dimension-and-geometry\/non-contact-diameter-and-ovality-measurement\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Non-contact diameter and ovality measurement - RODER SRL\" \/>\n<meta property=\"og:description\" content=\"Non-contact diameter and ovality measurement inspects round products, such as tubes, bars, cables and coils, on the production line, without touching them and without stopping the process, using optical and LASER technologies. 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