{"id":3449,"date":"2014-02-12T14:17:38","date_gmt":"2014-02-12T14:17:38","guid":{"rendered":"https:\/\/www.ophiropt.com\/blog\/laser-measurement\/?p=3449"},"modified":"2024-09-12T19:47:02","modified_gmt":"2024-09-12T19:47:02","slug":"how-to-use-a-water-cooled-laser-power-sensor","status":"publish","type":"post","link":"https:\/\/www.ophiropt.com\/blog\/how-to-use-a-water-cooled-laser-power-sensor\/","title":{"rendered":"How to Use a Water-Cooled Laser Power Sensor"},"content":{"rendered":"<p>Thermal laser sensors for high powers are usually water-cooled.\u00a0 Ophir has <a href=\"https:\/\/www.ophiropt.com\/en\/c\/thermopile-sensors\">water-cooled sensors<\/a> for powers from 250 W to 100 kW.\u00a0 There are a few things you might have been wondering about and even some things you might not have considered.\u00a0 I\u2019ll outline the basic things you should keep in mind to get the best performance from your water-cooled sensor.<!--more--><\/p>\n<p>First of all, here are our recommended operating conditions:<\/p>\n<ul>\n<li>Inlet water temperature 18\u00b0 C \u2013 30\u00b0 C<\/li>\n<li>Flow rate from 3-15\u00a0L\/min for most sensors (see specs for details).\u00a0 Note the very high power sensors for 30-120 kW need a higher flow rate.<\/li>\n<li>Coolant pressure depends on the sensor \u2013 see this <a href=\"https:\/\/www.ophiropt.com\/laser-measurement-instruments\/laser-power-energy-meters\/services\/faq#4_4_9\">FAQ<\/a> for details<\/li>\n<\/ul>\n<p>There are also some less obvious things that bear mentioning\u2026<\/p>\n<p><strong>Temperature Fluctuations<\/strong><\/p>\n<p>Although the water can be any temperature within the above range, it must be quite stable.\u00a0 Since thermal sensors detect heat flow, water changing in temperature will affect the power reading.\u00a0 The rate of temperature change should kept under one degree per minute.<\/p>\n<p>Also, if the water is considerably colder than the initial temperature of the sensor, the water has to flow for a couple of minutes till the sensor reaches its new equilibrium temperature.<\/p>\n<p><strong>Cold Water<\/strong><\/p>\n<p>Okay, so you can imagine that if the water is too hot, it won\u2019t cool the sensor very well.\u00a0 But what about cold water?\u00a0 Shouldn\u2019t that be even better?<\/p>\n<p>Generally, even if water is colder than the 18\u00b0 C limit, it should still work perfectly.\u00a0 However, there are two caveats you should take into consideration:<\/p>\n<ol>\n<li>Water is colder than room temperature.\u00a0 If the water is colder than the ambient temperature, this will make the sensor considerably cooler than the room and the sensor will &#8220;see&#8221; the room as a heat source causing a small offset in reading. This can be corrected by subtracting the offset with the laser power blocked.<\/li>\n<li>If the cold water creates condensation on the sensor, that will also cause problems.<\/li>\n<\/ol>\n<p><strong>Can You Skimp on the Flow Rate?<\/strong><\/p>\n<p>Sometimes we are asked: \u201cThe spec says 3\u00a0L\/min for the max power.\u00a0 Can I slow the rate to 1.5 L\/min for half the power?\u201d<\/p>\n<p>This is not an exact science, but it is generally a linear relationship.\u00a0 So, yes, you can usually reduce flow rate for lower powers in a linear fashion.<\/p>\n<p>In fact, for very low powers or for a very short measurement, you can stop the flow altogether.\u00a0 However \u2013 make sure the sensor is always filled with water.\u00a0 Even if it isn\u2019t flowing it\u2019s necessary for the thermal contact.<\/p>\n<p>Did I miss something?\u00a0 Have a question?\u00a0 Let me know.<\/p>\n<p><span style=\"color: #000080;\"><em>You might also like to read:\u00a0<\/em><\/span><\/p>\n<p><a title=\"Permanent Link to Measure 100 kW Directly with Ophir\u2019s Newest Laser Power Sensor\" href=\"\/?p=3194\">Measure 100 kW Directly with Ophir\u2019s Newest Laser Power Sensor<\/a><\/p>\n<p><a title=\"Permanent Link to How to Measure &lt;span style='font-weight:bold; background-color:yellow;'&gt;High&lt;\/span&gt; Power Laser Beams. &lt;span style='font-weight:bold; background-color:yellow;'&gt;Really High&lt;\/span&gt;.\" href=\"\/?p=2977\">How to Measure\u00a0High\u00a0Power Laser Beams.\u00a0Really High.<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Thermal laser sensors for high powers are usually water-cooled.\u00a0 Ophir has water-cooled sensors for powers from 250 W to 100 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":8636,"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-3449","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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