{"id":407948,"date":"2017-11-23T05:50:00","date_gmt":"2017-11-23T09:50:00","guid":{"rendered":"http:\/\/spaceweekly.com\/?guid=77d9b1674b349edb9ceab5694aaaf935"},"modified":"2017-11-23T05:50:00","modified_gmt":"2017-11-23T09:50:00","slug":"wall-of-hertz-test-chamber","status":"publish","type":"post","link":"https:\/\/spaceweekly.com\/?p=407948","title":{"rendered":"Wall of Hertz test chamber"},"content":{"rendered":"

\t\t\t\t\t<\/p>\n

\nThese spiky carbon-impregnated foam pyramids, seen here in ESA\u2019s Hertz test chamber, cover the walls of facilities that simulate the endless void of space.\n<\/p>\n

\nThis \u2018anechoic\u2019 foam absorbs radio signals, enabling radio-frequency testing without any distorting reflections from the chamber walls. In addition, it also absorbs sound \u2013 making these chambers eerily quiet places to work.\n<\/p>\n

\nESA\u2019s Hertz chamber<\/a>, in its technical centre in the Netherlands, is an isolated metal-walled chamber offering versatile ways of measuring a subject\u2019s radio-frequency performance. Its walls block all external electromagnetic energy such as TV broadcasts and mobile phone signals for uninterrupted testing.\n<\/p>\n

\nOther ESA radio-frequency testing facilities \u2013 including the smaller Compact Antenna Test Range<\/a> and the Maxwell chamber<\/a> for assessing the electromagnetic compatibility of satellite systems \u2013 are similarly clad with foam.<\/p>\n","protected":false},"excerpt":{"rendered":"

<\/p>\n

\nThese spiky carbon-impregnated foam pyramids, seen here in ESA’s Hertz test chamber, cover the walls of facilities that simulate the endless void of space.\n<\/p>\n

\nThis ‘anechoic’ foam absorbs radio signals, enabling radio-frequency testing without any distorting reflections from the chamber walls. In addition, it also absorbs sound – making these chambers eerily quiet places to work.\n<\/p>\n

\nESA’s Hertz chamber<\/a>, in its technical centre in the Netherlands, is an isolated metal-walled chamber offering versatile ways of measuring a subject’s radio-frequency performance. Its walls block all external electromagnetic energy such as TV broadcasts and mobile phone signals for uninterrupted testing.\n<\/p>\n

\nOther ESA radio-frequency testing facilities – including the smaller Compact Antenna Test Range<\/a> and the Maxwell chamber<\/a> for assessing the electromagnetic compatibility of satellite systems – are similarly clad with foam.<\/p>\n","protected":false},"author":5,"featured_media":615444,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27],"tags":[],"class_list":["post-407948","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-multimedia"],"_links":{"self":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/posts\/407948","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=407948"}],"version-history":[{"count":1,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/posts\/407948\/revisions"}],"predecessor-version":[{"id":407949,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/posts\/407948\/revisions\/407949"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/media\/615444"}],"wp:attachment":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=407948"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=407948"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=407948"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}