{"id":224,"date":"2007-01-30T09:47:15","date_gmt":"2007-01-30T09:47:15","guid":{"rendered":"http:\/\/www.jpyro.com\/wp\/?p=224"},"modified":"2007-01-30T09:47:15","modified_gmt":"2007-01-30T09:47:15","slug":"fixed-and-scanning-infrared-radiometers-for-combustion-studies","status":"publish","type":"post","link":"https:\/\/www.jpyro.co.uk\/?p=224","title":{"rendered":"Fixed and Scanning Infrared Radiometers for Combustion Studies"},"content":{"rendered":"<p align=\"left\"><strong>Kathy Underhill-Shanks and M. Keith Hudson &amp; Matthew J. Russo<\/strong><\/p>\n<p align=\"left\"><strong>ABSTRACT:<\/strong> The feasibility of using lead selenide (PbSe) detectors and simple electronic circuitry, including a 600 Hz chopper and chopper frequency\/ phase reference circuit, to detect infrared emissions from flames and rocket motor plumes was demonstrated. A fixed wavelength radiometer, employing one-inch interference filters and mechanical phase adjustment, was constructed to monitor the 4.4-&micro;m carbon dioxide band and the 2.7-&micro;m water vapor band. The fixed wavelength radiometer was used in flame studies and in several rocket motor tests. The design of the fixed wavelength radiometer was modified to produce a spectroradiometer. The spectroradiometer system included a circular variable filter (CVF) having a wavelength range of 2.1 to 4.7-&micro;m, which allowed wavelength scanning. The circuitry for the spectroradiometer was improved to include a time constant, which could be adjusted electronically, and an electronic phase adjustment. The spectroradiometer was used to monitor numerous rocket motor firings. The infrared emissions detected by the spectroradiometer included: the water vapor band at 2.7 &micro;m, the hydrogen chloride band at 3.5 &micro;m, and the carbon dioxide band at 4.4 &micro;m.<\/p>\n<p align=\"left\"><strong>Keywords:<\/strong> IR radiometer, rocket plume monitoring, PbSe detector, engine health, combustion diagnostics, infrared spectroscopy, IR emission<\/p>\n<hr \/>\n<p><strong>Ref:<\/strong> JPyro, Issue 12, 2000, pp57-67<br \/> (J12_57)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Kathy Underhill-Shanks and M. Keith Hudson &amp; Matthew J. Russo ABSTRACT: The feasibility of using lead selenide (PbSe) detectors and simple electronic circuitry, including a 600 Hz chopper and chopper frequency\/ phase reference circuit, to detect infrared emissions from flames and rocket motor plumes was demonstrated. A fixed wavelength radiometer, employing one-inch interference filters and &hellip;<br \/><a href=\"https:\/\/www.jpyro.co.uk\/?p=224\" class=\"more-link pen_button pen_element_default pen_icon_arrow_double\">Continue reading <span class=\"screen-reader-text\">Fixed and Scanning Infrared Radiometers for Combustion Studies<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2,29],"tags":[],"_links":{"self":[{"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/224"}],"collection":[{"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=224"}],"version-history":[{"count":0,"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/224\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=224"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=224"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=224"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}