{"id":25104,"date":"2013-03-08T22:37:49","date_gmt":"2013-03-09T03:37:49","guid":{"rendered":"https:\/\/www.windturbinesyndrome.com\/static\/static\/?p=25104"},"modified":"2013-03-17T21:01:56","modified_gmt":"2013-03-18T01:01:56","slug":"why-the-wind-industrys-turbine-noise-measurements-are-worthless","status":"publish","type":"post","link":"https:\/\/www.windturbinesyndrome.com\/static\/2013\/why-the-wind-industrys-turbine-noise-measurements-are-worthless\/","title":{"rendered":"Why the wind industry&#8217;s turbine noise measurements are worthless"},"content":{"rendered":"<div class=\"pf-content\"><p style=\"text-align: center;\"><img loading=\"lazy\" class=\" wp-image-25113 aligncenter\" alt=\"ruler\" src=\"https:\/\/www.windturbinesyndrome.com\/static\/wp-content\/uploads\/2013\/03\/ruler.jpg\" width=\"256\" height=\"127\" \/><\/p>\n<p><b>Why dBG, dBC, and dBA \u201chide\u201d the true \u201cdose\u201d of infrasound below 10 Hz<\/b><\/p>\n<p>The actual level of infrasound in this figure at 1 Hz is above 90 dB. Measuring infrasound with dBG at 1 Hz gives a level of only 50 dB.\u00a0 Thus 40 dB is \u201chidden.\u201d \u00a0Forty dB is a huge amount of sound energy, which will not be heard at that level, but may be perceived.<\/p>\n<p>The graph also demonstrates why dBA is useless at accurately measuring below 200Hz. \u00a0Measurement with dBC likewise fails to measure the true low frequency noise and infrasound level once you get below 100 Hz.<\/p>\n<p>The figure below came from the following sources:<\/p>\n<p><span style=\"color: #ff0000;\">\u00bb<\/span>\u00a0Salt, A.N. and Kaltenbach, J.A. (2011). Infrasound from Wind Turbines Could Affect Humans. Bulletin of Science, Technology and Science. (Aug 2011). 296-302. \u00a0(Downloadable from <a href=\"http:\/\/www.wind-watch.org\/documents\/wind-turbine-noise-and-health-special-issue-of-bulletin-of-science-technology-society\/\" target=\"_blank\">here<\/a>. \u00a0Scroll down to the fourth article.)<\/p>\n<p><span style=\"color: #ff0000;\">\u00bb<\/span>\u00a0Van den Berg, G. P. (2006). <a href=\"http:\/\/dissertations.ub.rug.nl\/faculties\/science\/2006\/g.p.van.den.berg\/\" target=\"_blank\">The sound of high winds: The effect of atmospheric\u00a0stability on wind turbine sound and microphone noise<\/a>. \u00a0PhD dissertation. University of Groningen, Netherlands.<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-25105\" alt=\"dB graph\" src=\"https:\/\/www.windturbinesyndrome.com\/static\/wp-content\/uploads\/2013\/03\/dB-graph.jpg\" width=\"600\" height=\"436\" srcset=\"https:\/\/www.windturbinesyndrome.com\/static\/wp-content\/uploads\/2013\/03\/dB-graph.jpg 600w, https:\/\/www.windturbinesyndrome.com\/static\/wp-content\/uploads\/2013\/03\/dB-graph-300x218.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>&nbsp;<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Why dBG, dBC, and dBA \u201chide\u201d the true \u201cdose\u201d of infrasound below 10 Hz The actual level of infrasound in this figure at 1 Hz is above 90 dB. Measuring infrasound with dBG at 1 Hz gives a level of only 50 dB.\u00a0 Thus 40 dB is \u201chidden.\u201d \u00a0Forty dB is a huge amount of sound energy, which will not be heard at that level, but may be perceived. The graph also demonstrates why dBA is useless at accurately measuring below 200Hz. \u00a0Measurement with dBC likewise fails to measure the true low frequency noise and infrasound level once you get below 100 Hz. The figure below came from the following sources: \u00bb\u00a0Salt, A.N. and Kaltenbach, J.A. (2011). Infrasound from Wind Turbines Could Affect Humans. Bulletin of Science, Technology and Science. (Aug 2011). 296-302. \u00a0(Downloadable from here. \u00a0Scroll down to the fourth article.) \u00bb\u00a0Van den Berg, G. P. (2006). The sound of high winds: The effect of atmospheric\u00a0stability on wind turbine sound and microphone noise. \u00a0PhD dissertation. University of Groningen, Netherlands. &nbsp;<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[157,163,16],"tags":[],"_links":{"self":[{"href":"https:\/\/www.windturbinesyndrome.com\/static\/wp-json\/wp\/v2\/posts\/25104"}],"collection":[{"href":"https:\/\/www.windturbinesyndrome.com\/static\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.windturbinesyndrome.com\/static\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.windturbinesyndrome.com\/static\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.windturbinesyndrome.com\/static\/wp-json\/wp\/v2\/comments?post=25104"}],"version-history":[{"count":0,"href":"https:\/\/www.windturbinesyndrome.com\/static\/wp-json\/wp\/v2\/posts\/25104\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.windturbinesyndrome.com\/static\/wp-json\/wp\/v2\/media?parent=25104"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.windturbinesyndrome.com\/static\/wp-json\/wp\/v2\/categories?post=25104"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.windturbinesyndrome.com\/static\/wp-json\/wp\/v2\/tags?post=25104"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}