{"id":6764,"date":"2017-07-26T13:31:24","date_gmt":"2017-07-26T13:31:24","guid":{"rendered":"https:\/\/www.ophiropt.com\/blog\/laser-measurement\/?p=6764"},"modified":"2024-05-16T07:12:28","modified_gmt":"2024-05-16T07:12:28","slug":"keep-cool-avoiding-sensor-drift","status":"publish","type":"post","link":"https:\/\/www.ophiropt.com\/blog\/keep-cool-avoiding-sensor-drift\/","title":{"rendered":"Keep Cool: Avoiding Sensor Drift"},"content":{"rendered":"<p>In theory, there is no difference between theory and practice.<\/p>\n<p>In practice, there usually is.<\/p>\n<p>When a laser power sensor is rated for up to some maximum average power, that means 2 things:<!--more--><\/p>\n<p>1. Its sensing element can measure up to that power.<br \/>\n2. The sensor\u2019s mechanical body plan is designed to dissipate heat at up to that rate. (A beam with higher average power than that will cause heat to build up inside the sensor, eventually leading to possible sensor failure.)<\/p>\n<p>For example, the \u201c30A-BB-18\u201d sensor is specified for up to 30W; its body uses a \u201cpin-fin\u201d design that dissipates heat at a rate of 30W. So, as long as the incoming beam power doesn\u2019t exceed 30W, then the heat goes out as fast as it comes in and all is well. And in theory, this can go on forever (or until the next recalibration due date).<a href=\"\/blog\/wp-content\/uploads\/2017\/05\/fantasy-639115_1920.jpg\"><img decoding=\"async\" class=\"wp-image-6766 alignleft lazyload\" data-src=\"\/blog\/wp-content\/uploads\/2017\/05\/fantasy-639115_1920.jpg\" alt=\"\" width=\"341\" height=\"241\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 341px; --smush-placeholder-aspect-ratio: 341\/241;\" \/><\/a><\/p>\n<p>In theory.<\/p>\n<p>In practice, though, it\u2019s not quite as simple as that.<\/p>\n<p>A champion weightlifter who can bench-press 500kg, may not want to do so for hours at a time.<\/p>\n<p>Similarly, a sensor that can handle up to a given maximum average power, may not necessarily perform well if it\u2019s pushing the upper limits for an extended time.<br \/>\nOther issues may come into play that could cause the reading to drift over time, a result of the sensor heating up \u2013 true, not to the point of failure, but enough to cause problems if continuing for long enough.<\/p>\n<p>The bottom line is simply this: If you need to perform a measurement for an extended time, perhaps a burn-in type of test for example, then use a sensor for which you will not be pressing it to its limits. For short term measurements that would be fine, but for longer term exposure you\u2019ll want a sensor for which your beam is comfortably below the sensor\u2019s maximum rated power.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mark Slutzki explains the difference between real life and theory and how it all connects to the way you can avoid Sensor Drift&#8230;<\/p>\n","protected":false},"author":4,"featured_media":7021,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[5,6],"tags":[],"ophirposttype":[349],"class_list":["post-6764","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-laser-power-energy-measurement","category-laser-power-energy-sensors-en","ophirposttype-blogpost-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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