{"id":4379,"date":"2020-10-21T19:59:35","date_gmt":"2020-10-21T19:59:35","guid":{"rendered":"https:\/\/aerotechinc.wpengine.com\/?p=4379"},"modified":"2024-06-28T14:33:59","modified_gmt":"2024-06-28T18:33:59","slug":"machine-positioning-uncertainty-with-laser-interferometer-feedback","status":"publish","type":"post","link":"https:\/\/www.aerotech.com\/machine-positioning-uncertainty-with-laser-interferometer-feedback\/","title":{"rendered":"Machine Positioning Uncertainty with Laser Interferometer Feedback"},"content":{"rendered":"<p>The purpose of this discussion is to explain the major contributors to machine positioning uncertainty in systems with laser interferometer feedback near the work point. We will use an example to quantify these uncertainties in a real implementation of a laser-feedback-driven machine.<\/p><p>Laser interferometers are used as a measurement reference for machine correction and accuracy validation in the production of many high precision motion systems. Under controlled environmental conditions, laser interferometer measurement can provide low measurement uncertainty relative to the achievable accuracy of most commonly used motion control devices. As such, when processes require the utmost precision, laser interferometer measurement near the machine\u2019s work point is frequently used as the feedback mechanism for machine control. In these instances, the use of laser interferometry to characterize the machine\u2019s motion is unjustified because the measurement uncertainty of the metrology system is equivalent or higher than the motion error. The accuracy of these machines&#8217; motion must be equated to an uncertainty in the feedback system&#8217;s measurement of the defined work point&#8217;s motion.<\/p><p>The purpose of this discussion is to explain the major contributors to machine positioning uncertainty in systems with laser interferometer feedback near the work point. We will use an example to quantify these uncertainties in a real implementation of a laser-feedback-driven machine. This is not meant to be an introduction to measurement uncertainty, laser interferometer feedback, error\/uncertainty budgeting, or rigid body error motions. It is meant to be an overview of the level of work point position measurement uncertainty that can be obtained in a specific machine design.<\/p><div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n    <div class=\"wp-block-button aligncenter\">\n        <span class=\"hs-cta-trigger-button hs-cta-trigger-button-170292590960 wp-block-button__link has-white-color has-vivid-cyan-blue-background-color has-text-color has-background wp-element-button\" target=\"_blank\" rel=\"noreferrer noopener\">Download White Paper<\/span>\n    <\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>The purpose of this discussion is to explain the major&hellip;<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","_searchwp_excluded":"","footnotes":""},"categories":[956,954,948,955,942,937,944,940,958],"tags":[],"content_type":[972],"industry":[980,981,982],"topic":[992,993,983,994,991],"class_list":["post-4379","post","type-post","status-publish","format-standard","hentry","category-3d-metrology-systems","category-custom-engineered-motion-systems","category-gantries","category-integrated-automation-systems","category-science-research","category-semiconductor","category-stages-actuators","category-test-inspection","category-white-paper","content_type-white-paper","industry-science-research-institutions","industry-semiconductor","industry-test-inspection","topic-3d-metrology-systems","topic-custom-engineered-motion","topic-gantries","topic-integrated-automation-systems","topic-stages-actuators"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Machine Positioning Uncertainty | Aerotech US<\/title>\n<meta name=\"description\" content=\"To learn more about machine positioning uncertainty in systems with laser interferometer feedback near the work point, click here to read our whitepaper!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.aerotech.com\/machine-positioning-uncertainty-with-laser-interferometer-feedback\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Machine Positioning Uncertainty | Aerotech US\" \/>\n<meta property=\"og:description\" content=\"To learn more about machine positioning uncertainty in systems with laser interferometer feedback near the work point, click here to read our whitepaper!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.aerotech.com\/machine-positioning-uncertainty-with-laser-interferometer-feedback\/\" \/>\n<meta property=\"og:site_name\" content=\"Aerotech US\" \/>\n<meta property=\"article:published_time\" content=\"2020-10-21T19:59:35+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-06-28T18:33:59+00:00\" \/>\n<meta name=\"author\" content=\"dwebster\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"dwebster\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"15 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.aerotech.com\/machine-positioning-uncertainty-with-laser-interferometer-feedback\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.aerotech.com\/machine-positioning-uncertainty-with-laser-interferometer-feedback\/\"},\"author\":{\"name\":\"dwebster\",\"@id\":\"https:\/\/www.aerotech.com\/#\/schema\/person\/1c49828c1ca04a5ebdd6101b094ed6b2\"},\"headline\":\"Machine Positioning Uncertainty with Laser Interferometer Feedback\",\"datePublished\":\"2020-10-21T19:59:35+00:00\",\"dateModified\":\"2024-06-28T18:33:59+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.aerotech.com\/machine-positioning-uncertainty-with-laser-interferometer-feedback\/\"},\"wordCount\":272,\"publisher\":{\"@id\":\"https:\/\/www.aerotech.com\/#organization\"},\"articleSection\":[\"3D Metrology Systems\",\"Custom Engineered Motion Systems\",\"Gantries\",\"Integrated Automation Systems\",\"Science &amp; 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