{"id":392,"date":"2019-04-17T21:28:42","date_gmt":"2019-04-17T21:28:42","guid":{"rendered":"https:\/\/live-optics-wp.pantheonsite.io\/oscoutreach\/?p=392"},"modified":"2024-01-25T14:34:25","modified_gmt":"2024-01-25T14:34:25","slug":"moire-patterns","status":"publish","type":"post","link":"https:\/\/wp.optics.arizona.edu\/oscoutreach\/moire-patterns\/","title":{"rendered":"Moire Patterns"},"content":{"rendered":"\n<p><strong>Overview<\/strong>: A Moire pattern is an interference pattern that arrises when identical patterns overlap each other with a slight offset. We can see this in everyday things from our printed paper (yep! check it out with a microscope) or water wave motion.<\/p>\n\n\n\n<p>\u200b\u200b<strong>Supplies<\/strong>: Pairs of sheets with identical patterns<\/p>\n\n\n\n<p><strong>Objectives<\/strong>: See how different types of interference form as the patterns on the sheets change<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<p><strong>Setup:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Grab two sheets with identical patterns and place them over each other<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<figure class=\"wp-block-image is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"248\" height=\"489\" src=\"https:\/\/wp.optics.arizona.edu\/oscoutreach\/wp-content\/uploads\/sites\/75\/2019\/04\/Superimpose.png\" alt=\"\" class=\"wp-image-393\" style=\"aspect-ratio:0.5071574642126789;width:195px;height:auto\" srcset=\"https:\/\/wp.optics.arizona.edu\/oscoutreach\/wp-content\/uploads\/sites\/75\/2019\/04\/Superimpose.png 248w, https:\/\/wp.optics.arizona.edu\/oscoutreach\/wp-content\/uploads\/sites\/75\/2019\/04\/Superimpose-152x300.png 152w\" sizes=\"auto, (max-width: 248px) 100vw, 248px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<figure class=\"wp-block-image is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"250\" height=\"290\" src=\"https:\/\/wp.optics.arizona.edu\/oscoutreach\/wp-content\/uploads\/sites\/75\/2019\/04\/Moire.gif\" alt=\"\" class=\"wp-image-433\" style=\"aspect-ratio:0.8620689655172413;width:307px;height:auto\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p><strong>How to run the demo:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Move the sheets around to see the Moire pattern and how it changes<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/wp.optics.arizona.edu\/oscoutreach\/wp-content\/uploads\/sites\/75\/2019\/04\/MoireLFD.jpg\" alt=\"\" class=\"wp-image-465\" srcset=\"https:\/\/wp.optics.arizona.edu\/oscoutreach\/wp-content\/uploads\/sites\/75\/2019\/04\/MoireLFD.jpg 600w, https:\/\/wp.optics.arizona.edu\/oscoutreach\/wp-content\/uploads\/sites\/75\/2019\/04\/MoireLFD-300x200.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure>\n<\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<p><strong>What&#8217;s Happening?<\/strong><\/p>\n\n\n\n<p>A slight motion of one of the objects creates large-scale changes in the moir\u00e9 pattern.<\/p>\n\n\n\n<p>In mathematics, physics, and art, a moir\u00e9 pattern or moir\u00e9 fringes are large scale interference patterns that can be produced when an opaque ruled pattern with transparent gaps is overlaid on another similar pattern. For the moir\u00e9 interference pattern to appear, the two patterns must not be completely identical in that they must be displaced, rotated, etc., or have different but similar pitch.<\/p>\n\n\n\n<p>Moir\u00e9 patterns magnify differences between two repetitive patterns. If two patterns are exactly lined up, then no moir\u00e9 pattern appears. The slightest misalignment of two patterns will create a large-scale, easily visible moir\u00e9 pattern. As the misalignment increases, the lines of the moir\u00e9 pattern will appear thinner and closer together.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<p><strong>Learn more:<\/strong> (external links)<\/p>\n\n\n\n<p>Moire Patterns explained<\/p>\n\n\n\n<p><a href=\"https:\/\/xkcd.com\/1814\/\">XKCD Comic<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Repetitive structures interfering with repetitive structures.<\/p>\n","protected":false},"author":43,"featured_media":394,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,2],"tags":[],"class_list":["post-392","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-everyday-optics","category-optical-illusion"],"_links":{"self":[{"href":"https:\/\/wp.optics.arizona.edu\/oscoutreach\/wp-json\/wp\/v2\/posts\/392","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.optics.arizona.edu\/oscoutreach\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.optics.arizona.edu\/oscoutreach\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.optics.arizona.edu\/oscoutreach\/wp-json\/wp\/v2\/users\/43"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.optics.arizona.edu\/oscoutreach\/wp-json\/wp\/v2\/comments?post=392"}],"version-history":[{"count":14,"href":"https:\/\/wp.optics.arizona.edu\/oscoutreach\/wp-json\/wp\/v2\/posts\/392\/revisions"}],"predecessor-version":[{"id":1565,"href":"https:\/\/wp.optics.arizona.edu\/oscoutreach\/wp-json\/wp\/v2\/posts\/392\/revisions\/1565"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/wp.optics.arizona.edu\/oscoutreach\/wp-json\/wp\/v2\/media\/394"}],"wp:attachment":[{"href":"https:\/\/wp.optics.arizona.edu\/oscoutreach\/wp-json\/wp\/v2\/media?parent=392"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.optics.arizona.edu\/oscoutreach\/wp-json\/wp\/v2\/categories?post=392"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.optics.arizona.edu\/oscoutreach\/wp-json\/wp\/v2\/tags?post=392"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}