{"id":220,"date":"2015-02-22T12:11:59","date_gmt":"2015-02-22T12:11:59","guid":{"rendered":"http:\/\/blog.soton.ac.uk\/thz\/?page_id=220"},"modified":"2022-01-28T17:22:17","modified_gmt":"2022-01-28T17:22:17","slug":"parameter-extraction-algorithm","status":"publish","type":"page","link":"https:\/\/blog.soton.ac.uk\/thz\/research\/parameter-extraction-algorithm\/","title":{"rendered":"Parameter Extraction Algorithm"},"content":{"rendered":"<h2>Transfer Function based refractive index extraction algorithm for THz-TDS<\/h2>\n<p>&nbsp;<\/p>\n<p>The algorithm uses a transfer function to extract a refractive index from a slab material. It works for THz time domain spectroscopy measurements that have been taken in a transmission geometry. For inputs the algorithm requires; a time domain scan of a sample, a time domain reference scan, and the thickness of the sample. The algorithm will output the complex refractive index of the sample.<\/p>\n<ul>\n<li>The complex refractive index of a material is determined by fitting a theoretically calculated transfer function to the experimental data.<\/li>\n<li><span lang=\"EN-US\">The calculation of the theoretical transfer function is done using Fresnel coefficients<\/span><\/li>\n<li>The calculation of the experimental transfer function is the division in frequency of the signal obtained with the same and a reference scan without the sample<\/li>\n<li>Complex refractive index can be used to determine material properties such as relative permittivity, conductivity<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-227\" src=\"http:\/\/blog.soton.ac.uk\/thz\/files\/2015\/02\/Algorithm-schematic-1024x407.png\" alt=\"Algorithm schematic\" width=\"452\" height=\"180\" srcset=\"https:\/\/blog.soton.ac.uk\/thz\/files\/2015\/02\/Algorithm-schematic-1024x407.png 1024w, https:\/\/blog.soton.ac.uk\/thz\/files\/2015\/02\/Algorithm-schematic-300x119.png 300w, https:\/\/blog.soton.ac.uk\/thz\/files\/2015\/02\/Algorithm-schematic.png 1687w\" sizes=\"auto, (max-width: 452px) 100vw, 452px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>Our algorithms are free, now we are developing also machine learning algorithms to improve on the accuracy of normal transfer function based algorithms.<\/p>\n<h2><\/h2>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Transfer Function based refractive index extraction algorithm for THz-TDS &nbsp; The algorithm uses a transfer function to extract a refractive index from a slab material. It works for THz time domain spectroscopy measurements that have been taken in a transmission geometry. For inputs the algorithm requires; a time domain scan of a sample, a time &hellip; <\/p>\n<p><a class=\"more-link block-button\" href=\"https:\/\/blog.soton.ac.uk\/thz\/research\/parameter-extraction-algorithm\/\">Continue reading &raquo;<\/a><\/p>\n","protected":false},"author":80416,"featured_media":0,"parent":23,"menu_order":1,"comment_status":"open","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-220","page","type-page","status-publish","hentry","nodate"],"_links":{"self":[{"href":"https:\/\/blog.soton.ac.uk\/thz\/wp-json\/wp\/v2\/pages\/220","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.soton.ac.uk\/thz\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/blog.soton.ac.uk\/thz\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/blog.soton.ac.uk\/thz\/wp-json\/wp\/v2\/users\/80416"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.soton.ac.uk\/thz\/wp-json\/wp\/v2\/comments?post=220"}],"version-history":[{"count":20,"href":"https:\/\/blog.soton.ac.uk\/thz\/wp-json\/wp\/v2\/pages\/220\/revisions"}],"predecessor-version":[{"id":345,"href":"https:\/\/blog.soton.ac.uk\/thz\/wp-json\/wp\/v2\/pages\/220\/revisions\/345"}],"up":[{"embeddable":true,"href":"https:\/\/blog.soton.ac.uk\/thz\/wp-json\/wp\/v2\/pages\/23"}],"wp:attachment":[{"href":"https:\/\/blog.soton.ac.uk\/thz\/wp-json\/wp\/v2\/media?parent=220"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}