{"id":1543,"date":"2016-10-20T22:48:57","date_gmt":"2016-10-21T05:48:57","guid":{"rendered":"http:\/\/laserpubs.com\/techcomm\/?page_id=1543"},"modified":"2016-10-20T22:56:42","modified_gmt":"2016-10-21T05:56:42","slug":"gas-lensing-illustrations","status":"publish","type":"page","link":"https:\/\/laserpubs.com\/techcomm\/?page_id=1543","title":{"rendered":"Gas lensing &#8211; illustrations"},"content":{"rendered":"<p>Here are graphics related to my <a href=\"http:\/\/laserpubs.com\/techcomm\/?p=1514\">focus post<\/a>.<\/p>\n<ul>\n<li>The tests were performed with the head assembled and nozzle in place.<\/li>\n<li>The system used a 5&#8243; focus lens, and the target was placed about 5&#8243; from the nozzle tip.<\/li>\n<li>Burns were made manually (if I remember correctly) long enough to show a burn pattern in acrylic target.<\/li>\n<\/ul>\n<div id=\"attachment_1539\" style=\"width: 242px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/laserpubs.com\/techcomm\/wp-content\/uploads\/2016\/10\/focus-burn-setup.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1539\" class=\"size-medium wp-image-1539\" src=\"http:\/\/laserpubs.com\/techcomm\/wp-content\/uploads\/2016\/10\/focus-burn-setup-232x300.png\" alt=\"Beam passes through the lens, and past the focus point it expands again. Put the target at 2x the focus length from the lens.\" width=\"232\" height=\"300\" srcset=\"https:\/\/laserpubs.com\/techcomm\/wp-content\/uploads\/2016\/10\/focus-burn-setup-232x300.png 232w, https:\/\/laserpubs.com\/techcomm\/wp-content\/uploads\/2016\/10\/focus-burn-setup-768x994.png 768w, https:\/\/laserpubs.com\/techcomm\/wp-content\/uploads\/2016\/10\/focus-burn-setup-791x1024.png 791w, https:\/\/laserpubs.com\/techcomm\/wp-content\/uploads\/2016\/10\/focus-burn-setup.png 816w\" sizes=\"(max-width: 232px) 100vw, 232px\" \/><\/a><p id=\"caption-attachment-1539\" class=\"wp-caption-text\">Beam passes through the lens, and past the focus point it expands again. Put the target at 2x the focus length from the lens.<\/p><\/div>\n<p>&nbsp;<\/p>\n<div id=\"attachment_1540\" style=\"width: 242px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/laserpubs.com\/techcomm\/wp-content\/uploads\/2016\/10\/burn-setup-2.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1540\" class=\"size-medium wp-image-1540\" src=\"http:\/\/laserpubs.com\/techcomm\/wp-content\/uploads\/2016\/10\/burn-setup-2-232x300.png\" alt=\"beam, lens, gas inlet\" width=\"232\" height=\"300\" srcset=\"https:\/\/laserpubs.com\/techcomm\/wp-content\/uploads\/2016\/10\/burn-setup-2-232x300.png 232w, https:\/\/laserpubs.com\/techcomm\/wp-content\/uploads\/2016\/10\/burn-setup-2-768x994.png 768w, https:\/\/laserpubs.com\/techcomm\/wp-content\/uploads\/2016\/10\/burn-setup-2-791x1024.png 791w, https:\/\/laserpubs.com\/techcomm\/wp-content\/uploads\/2016\/10\/burn-setup-2.png 816w\" sizes=\"(max-width: 232px) 100vw, 232px\" \/><\/a><p id=\"caption-attachment-1540\" class=\"wp-caption-text\">Beam goes through the lens, target at 2x focus length so the beam is about the raw size.<\/p><\/div>\n<p>&nbsp;<\/p>\n<p>I really don&#8217;t recall what we were looking for. When I made a test with moderately high gas pressure, I couldn&#8217;t believe the sharp spike in the middle of the burn.<\/p>\n<p>We made a series of tests, and verified that it happened proportionally with gas pressure at the cutting head. Incredible!<\/p>\n<div id=\"attachment_1538\" style=\"width: 242px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/laserpubs.com\/techcomm\/wp-content\/uploads\/2016\/10\/burn-results.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1538\" class=\"size-medium wp-image-1538\" src=\"http:\/\/laserpubs.com\/techcomm\/wp-content\/uploads\/2016\/10\/burn-results-232x300.png\" alt=\"Burns showing spike from gas lens\" width=\"232\" height=\"300\" srcset=\"https:\/\/laserpubs.com\/techcomm\/wp-content\/uploads\/2016\/10\/burn-results-232x300.png 232w, https:\/\/laserpubs.com\/techcomm\/wp-content\/uploads\/2016\/10\/burn-results-768x994.png 768w, https:\/\/laserpubs.com\/techcomm\/wp-content\/uploads\/2016\/10\/burn-results-791x1024.png 791w, https:\/\/laserpubs.com\/techcomm\/wp-content\/uploads\/2016\/10\/burn-results.png 816w\" sizes=\"(max-width: 232px) 100vw, 232px\" \/><\/a><p id=\"caption-attachment-1538\" class=\"wp-caption-text\">What the targets looked like with increasing gas pressure.<\/p><\/div>\n<p>Heh &#8211; our very accomplished PhD boss first said &#8220;that&#8217;s impossible!&#8221;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Here are graphics related to my focus post. The tests were performed with the head assembled and nozzle in place. The system used a 5&#8243; focus lens, and the target was placed about 5&#8243; from the nozzle tip. Burns were &hellip; <a href=\"https:\/\/laserpubs.com\/techcomm\/?page_id=1543\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":419,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":""},"_links":{"self":[{"href":"https:\/\/laserpubs.com\/techcomm\/index.php?rest_route=\/wp\/v2\/pages\/1543"}],"collection":[{"href":"https:\/\/laserpubs.com\/techcomm\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/laserpubs.com\/techcomm\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/laserpubs.com\/techcomm\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/laserpubs.com\/techcomm\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1543"}],"version-history":[{"count":5,"href":"https:\/\/laserpubs.com\/techcomm\/index.php?rest_route=\/wp\/v2\/pages\/1543\/revisions"}],"predecessor-version":[{"id":1550,"href":"https:\/\/laserpubs.com\/techcomm\/index.php?rest_route=\/wp\/v2\/pages\/1543\/revisions\/1550"}],"up":[{"embeddable":true,"href":"https:\/\/laserpubs.com\/techcomm\/index.php?rest_route=\/wp\/v2\/pages\/419"}],"wp:attachment":[{"href":"https:\/\/laserpubs.com\/techcomm\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1543"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}