{"id":1787,"date":"2016-10-17T21:17:08","date_gmt":"2016-10-17T20:17:08","guid":{"rendered":"http:\/\/www.joostrekveld.net\/?p=1787"},"modified":"2016-10-22T13:14:07","modified_gmt":"2016-10-22T12:14:07","slug":"scanning-electrometer","status":"publish","type":"post","link":"https:\/\/www.joostrekveld.net\/?p=1787","title":{"rendered":"scanning electrometer"},"content":{"rendered":"<figure id=\"attachment_1789\" aria-describedby=\"caption-attachment-1789\" style=\"width: 494px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/www.joostrekveld.net\/wp\/wp-content\/uploads\/2016\/10\/electroscan01.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.joostrekveld.net\/wp\/wp-content\/uploads\/2016\/10\/electroscan01-494x429.jpg\" alt=\"one of my first attempts at building a &#039;scanning electrometer&#039;.\" width=\"494\" height=\"429\" class=\"size-large wp-image-1789\" srcset=\"https:\/\/www.joostrekveld.net\/wp\/wp-content\/uploads\/2016\/10\/electroscan01-494x429.jpg 494w, https:\/\/www.joostrekveld.net\/wp\/wp-content\/uploads\/2016\/10\/electroscan01-188x163.jpg 188w, https:\/\/www.joostrekveld.net\/wp\/wp-content\/uploads\/2016\/10\/electroscan01-690x600.jpg 690w, https:\/\/www.joostrekveld.net\/wp\/wp-content\/uploads\/2016\/10\/electroscan01.jpg 1500w\" sizes=\"auto, (max-width: 494px) 100vw, 494px\" \/><\/a><figcaption id=\"caption-attachment-1789\" class=\"wp-caption-text\">one of my first attempts at building a &#8216;scanning electrometer&#8217;.<\/figcaption><\/figure>\n<p>At the moment I am working to improve a rather elementary sensor for electrostatic fields, in an attempt to use it to make images. Since I do not really know what these images should look like, that brought me to an interesting and unexpected philosophical question today:<\/p>\n<p>how do we know that a sensor that scans the environment is picking up more than artefacts of its own scanning motion ?<\/p>\n<figure id=\"attachment_1795\" aria-describedby=\"caption-attachment-1795\" style=\"width: 494px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/www.joostrekveld.net\/wp\/wp-content\/uploads\/2016\/10\/electrostaticscanner02.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.joostrekveld.net\/wp\/wp-content\/uploads\/2016\/10\/electrostaticscanner02-494x447.jpg\" alt=\"a primitive scanning setup.\" width=\"494\" height=\"447\" class=\"size-large wp-image-1795\" srcset=\"https:\/\/www.joostrekveld.net\/wp\/wp-content\/uploads\/2016\/10\/electrostaticscanner02-494x447.jpg 494w, https:\/\/www.joostrekveld.net\/wp\/wp-content\/uploads\/2016\/10\/electrostaticscanner02-188x170.jpg 188w, https:\/\/www.joostrekveld.net\/wp\/wp-content\/uploads\/2016\/10\/electrostaticscanner02-662x600.jpg 662w, https:\/\/www.joostrekveld.net\/wp\/wp-content\/uploads\/2016\/10\/electrostaticscanner02.jpg 1200w\" sizes=\"auto, (max-width: 494px) 100vw, 494px\" \/><\/a><figcaption id=\"caption-attachment-1795\" class=\"wp-caption-text\">a primitive scanning setup.<\/figcaption><\/figure>\n<p>UPDATE: turning the scanning device upside down also turns the main gradient in the image upside down, so we do have some sort of signal ?<br \/>\nThere is some way to go to make this do anything, however..<\/p>\n<figure id=\"attachment_1798\" aria-describedby=\"caption-attachment-1798\" style=\"width: 494px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/www.joostrekveld.net\/wp\/wp-content\/uploads\/2016\/10\/Screenshot_20161019_121844.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.joostrekveld.net\/wp\/wp-content\/uploads\/2016\/10\/Screenshot_20161019_121844-494x429.jpg\" alt=\"a scan with the scanner upside down.\" width=\"494\" height=\"429\" class=\"size-large wp-image-1798\" srcset=\"https:\/\/www.joostrekveld.net\/wp\/wp-content\/uploads\/2016\/10\/Screenshot_20161019_121844-494x429.jpg 494w, https:\/\/www.joostrekveld.net\/wp\/wp-content\/uploads\/2016\/10\/Screenshot_20161019_121844-188x163.jpg 188w, https:\/\/www.joostrekveld.net\/wp\/wp-content\/uploads\/2016\/10\/Screenshot_20161019_121844-690x600.jpg 690w, https:\/\/www.joostrekveld.net\/wp\/wp-content\/uploads\/2016\/10\/Screenshot_20161019_121844.jpg 1076w\" sizes=\"auto, (max-width: 494px) 100vw, 494px\" \/><\/a><figcaption id=\"caption-attachment-1798\" class=\"wp-caption-text\">a scan with the scanner upside down.<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>At the moment I am working to improve a rather elementary sensor for electrostatic fields, in an attempt to use it to make images. Since I do not really know what these images should look like, that brought me to an interesting and unexpected philosophical question today: how do we know that a sensor that &hellip; <a href=\"https:\/\/www.joostrekveld.net\/?p=1787\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">scanning electrometer<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":1798,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,11,12],"tags":[],"class_list":["post-1787","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-installations","category-observations","category-work"],"_links":{"self":[{"href":"https:\/\/www.joostrekveld.net\/index.php?rest_route=\/wp\/v2\/posts\/1787","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.joostrekveld.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.joostrekveld.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.joostrekveld.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.joostrekveld.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1787"}],"version-history":[{"count":7,"href":"https:\/\/www.joostrekveld.net\/index.php?rest_route=\/wp\/v2\/posts\/1787\/revisions"}],"predecessor-version":[{"id":1799,"href":"https:\/\/www.joostrekveld.net\/index.php?rest_route=\/wp\/v2\/posts\/1787\/revisions\/1799"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.joostrekveld.net\/index.php?rest_route=\/wp\/v2\/media\/1798"}],"wp:attachment":[{"href":"https:\/\/www.joostrekveld.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1787"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.joostrekveld.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1787"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.joostrekveld.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1787"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}