![\"3d-pov.jpg\"](\"http:\/\/layer8.typepad.com\/layer_8\/images\/3d-pov.jpg\")
<\/p>\n<\/p>\n
The hackaday<\/a> \/ make<\/a> \/ street tech<\/a> world has covered a lot of neat “persistence of vision” things lately. Basically, these involve a microcontroller that controls LEDs to light in a particular pattern such that as the device<\/a> is waved around (or, in some variatinos, the shoe<\/a> or bike wheel<\/a> to which it’s attached moves) a perceptible image – usually text – is created. [Update: some more really cool bike-wheel PoV<\/a> displays are here.]<\/p>\n New Scientist reports that researchers in Japan have taken this a big step further<\/a>:<\/p>\n The display utilises an ionisation effect which occurs when a beam of laser light is focused to a point in air. The laser beam itself is invisible to the human eye but, if the intensity of the laser pulse exceeds a threshold, the air breaks down into glowing plasma that emits visible light.<\/p>\n The required intensity can only be achieved by very short, powerful laser pulses – each plasma dot, or “flashpoint”, lasts for only about a nanosecond. But the resulting image appears to last longer due to persistence of vision. As with film and television, the impression of a continuous image is maintained by refreshing the flashpoints.<\/p>\n<\/blockquote>\n The neat-o factor here is considerable, and there are certainly some cool human-friendly applications of something like this to be discovered. On the other hand, the article starts: “The night sky could soon be lit up with gigantic three-dimensional adverts…<\/i>“. Oh, great. <\/p>\n (via smartmobs<\/a>)<\/p>\n","protected":false},"excerpt":{"rendered":" The hackaday \/ make \/ street tech world has covered a lot of neat “persistence of vision” things lately. Basically, these involve a microcontroller that controls LEDs to light in a particular pattern such that as the device is waved around (or, in some variatinos, the shoe or bike wheel to which it’s attached moves) […]<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,11,6],"tags":[],"class_list":["post-84","post","type-post","status-publish","format-standard","hentry","category-art","category-business","category-tech","category-8-id","category-11-id","category-6-id","post-seq-1","post-parity-odd"],"_links":{"self":[{"href":"https:\/\/www.netfluvia.org\/layer8\/index.php?rest_route=\/wp\/v2\/posts\/84","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.netfluvia.org\/layer8\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.netfluvia.org\/layer8\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.netfluvia.org\/layer8\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.netfluvia.org\/layer8\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=84"}],"version-history":[{"count":0,"href":"https:\/\/www.netfluvia.org\/layer8\/index.php?rest_route=\/wp\/v2\/posts\/84\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.netfluvia.org\/layer8\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=84"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.netfluvia.org\/layer8\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=84"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.netfluvia.org\/layer8\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=84"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}\n