{"id":6088,"date":"2026-10-19T09:48:27","date_gmt":"2026-10-19T09:48:27","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-edlisfraedi-michael-juhl\/"},"modified":"2026-10-19T09:48:27","modified_gmt":"2026-10-19T09:48:27","slug":"doktorsvorn-i-edlisfraedi-michael-juhl","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-edlisfraedi-michael-juhl\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed e\u00f0lisfr\u00e6\u00f0i – Michael Juhl"},"content":{"rendered":"
\n
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Doktorsefni:<\/strong> Michael Juhl<\/p>\n

Heiti ritger\u00f0ar:<\/strong> Skautunargreining me\u00f0 fylki \u00f6rloftneta<\/p>\n

Andm\u00e6lendur:<\/strong>
\nDr. N. Asger Mortensen, pr\u00f3fessor og VILLUM investigator vi\u00f0 Center for Nano Optics og forst\u00f6\u00f0uma\u00f0ur Technical Science vi\u00f0 Danish Institute for Advanced Study vi\u00f0 Syddansk Universitet.<\/p>\n

Dr. Slawomir M. Koziel, pr\u00f3fessor vi\u00f0 t\u00e6kni- og verkfr\u00e6\u00f0ideild H\u00e1sk\u00f3lans \u00ed Reykjav\u00edk.<\/p>\n

Lei\u00f0beinandi:<\/strong> Dr. Kristj\u00e1n Le\u00f3sson, framkv\u00e6mdastj\u00f3ri efnis-, l\u00edf- og orkut\u00e6knideildar N\u00fdsk\u00f6punarmi\u00f0st\u00f6\u00f0var \u00cdslands.<\/p>\n

Einnig \u00ed doktorsnefnd:<\/strong>
\nDr. Hafli\u00f0i P\u00e9tur G\u00edslason, pr\u00f3fessor vi\u00f0 Raunv\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands.<\/p>\n

Dr. J. P. Balthasar M\u00fcller, Associate \u00ed hagn\u00fdtri e\u00f0lisfr\u00e6\u00f0i vi\u00f0 Harvard School of Engineering and Applied Sciences og forritari hj\u00e1 Cloudera Fast Forward Labs.<\/p>\n

Doktorsv\u00f6rn st\u00fdrir:<\/strong> Dr. Oddur Ing\u00f3lfsson, pr\u00f3fessor og deildarforseti Raunv\u00edsindadeildar H\u00e1sk\u00f3la \u00cdslands.<\/p>\n

\u00c1grip<\/strong><\/p>\n

Skautunar\u00e1stand rafsegulbylgju veitir uppl\u00fdsingar um uppsprettu hennar og e\u00f0liseiginleika \u00feeirra hluta sem rafsegulbylgjan hefur v\u00edxlverka\u00f0 vi\u00f0. Rafsegulbylgjur \u00e1 \u00e1kve\u00f0nu t\u00ed\u00f0nibili k\u00f6llum vi\u00f0 lj\u00f3s. M\u00e6lingar \u00e1 skautunar\u00e1standi lj\u00f3ss eiga s\u00e9r yfir 200 \u00e1ra s\u00f6gu og hafa \u00fe\u00e6r haft veruleg \u00e1hrif \u00e1 flestum svi\u00f0um v\u00edsinda og t\u00e6kni. Hin hra\u00f0a \u00fer\u00f3un sem \u00e1tt hefur s\u00e9r sta\u00f0 \u00e1 svi\u00f0i nan\u00f3t\u00e6kni \u00e1 s\u00ed\u00f0ustu \u00e1rum hefur gert okkur kleift a\u00f0 m\u00f3ta yfirbor\u00f0 sem hafa \u00e1hrif \u00e1 rafsegulbylgjur allt ni\u00f0ur \u00e1 s\u00fdnilega bylgjulengdasvi\u00f0i\u00f0 og n\u00fdta til \u00feess mynstur \u00fear sem minnstu einingar eru minni en ein bylgjulengd. Sl\u00edk yfirbor\u00f0 geta m.a. n\u00fdst til a\u00f0 einfalda og sm\u00e6kka \u00edhluti sem nota\u00f0ir eru \u00ed lj\u00f3st\u00e6kni \u00ed dag, svo sem linsur og hvers kyns lj\u00f3ss\u00edur en einnig lj\u00f3sskautunarm\u00e6la.
\n\u00cd \u00feessari ritger\u00f0 er ranns\u00f6ku\u00f0 h\u00f6nnun yfirbor\u00f0s til greiningar \u00e1 skautunar\u00e1standi rafsegulbylgju fyrir n\u00e6r-innrau\u00f0ar bylgjulengdir. Yfirbor\u00f0i\u00f0 er samsett \u00far fylki \u00f6rloftneta \u00far gulli sem hvert um sig er um fj\u00f3r\u00f0ungur \u00far bylgjulengd a\u00f0 st\u00e6r\u00f0. Saman dreifa loftnetin litlum hluta lj\u00f3ssins sem lendir \u00e1 yfirbor\u00f0inu \u00ed \u00e1kve\u00f0nar stefnur, eftir \u00fev\u00ed hvert upprunalegt skautunar\u00e1stand lj\u00f3ssins er. Me\u00f0 \u00fev\u00ed a\u00f0 m\u00e6la lj\u00f3sdreifinguna m\u00e1 f\u00e1 m\u00e6lingu \u00e1 Stokes-vigur lj\u00f3sbylgjunnar sem l\u00fdsir skautunar\u00e1standi hennar fyllilega.
\nSkautunarm\u00e6lar \u00e6tla\u00f0ir s\u00e9rstaklega fyrir \u00fe\u00e6r bylgjulengdir lj\u00f3ss sem n\u00fdttar eru \u00ed lj\u00f3slei\u00f0arasamskiptat\u00e6kni voru hanna\u00f0ir og sm\u00ed\u00f0a\u00f0ir me\u00f0 \u00fea\u00f0 fyrir augum a\u00f0 tengja \u00fe\u00e1 beint vi\u00f0 hef\u00f0bundna lj\u00f3slei\u00f0ara. Skautunarm\u00e6larnir samanstanda af \u00f6r\u00feunnu yfirbor\u00f0i me\u00f0 fylki loftneta og fj\u00f3rum e\u00f0a sex lj\u00f3snemum sem geta m\u00e6lt skautunar\u00e1standi\u00f0 \u00e1 h\u00e1rri m\u00e6lit\u00ed\u00f0ni, \u00e1n verulegrar truflunar \u00e1 upprunalega merkinu. Fr\u00e6\u00f0ilegt l\u00edkan af \u00fatgeislun yfirbor\u00f0sins var sm\u00ed\u00f0a\u00f0 og ni\u00f0urst\u00f6\u00f0ur \u00feess voru bornar saman vi\u00f0 t\u00f6lvuhermanir. Bornir voru saman skautunarm\u00e6lar sem n\u00fdta \u00f3l\u00edkar dreifingarstefnur lj\u00f3ssins, b\u00e6\u00f0i me\u00f0 reikningum og tilraunum. M\u00e6lin\u00e1kv\u00e6mnin \u00ed skautunargreiningunni var metin og fr\u00e6\u00f0ileg l\u00edk\u00f6n \u00fer\u00f3u\u00f0 til a\u00f0 l\u00fdsa kerfisbundnum m\u00e6liskekkjum. S\u00fdnt var fram \u00e1 m\u00f6guleika \u00e1 sm\u00e6kkun lj\u00f3sskautunargreinisins me\u00f0 \u00fev\u00ed a\u00f0 flytja mynstur loftneta yfir \u00e1 endafl\u00f6t lj\u00f3slei\u00f0ara. \u00der\u00f3u\u00f0 var s\u00e9rst\u00f6k a\u00f0fer\u00f0 til mynsturyfirf\u00e6rslu af k\u00edsilsk\u00edfum yfir \u00e1 lj\u00f3slei\u00f0ara me\u00f0 hj\u00e1lp s\u00e9rstakra l\u00edfr\u00e6nna\/\u00f3l\u00edfr\u00e6nna blendingsfj\u00f6lli\u00f0a. S\u00fdnt var fram \u00e1 a\u00f0 \u00feannig megi framkv\u00e6ma skautunarm\u00e6lingar beint \u00e1 lj\u00f3slei\u00f0aranum sj\u00e1lfum \u00e1n \u00feess a\u00f0 f\u00f3rna m\u00e6lin\u00e1kv\u00e6mni og \u00e1 sama t\u00edma k\u00fapla st\u00e6rstum hluta lj\u00f3smerkisins aftur inn \u00ed annan lj\u00f3slei\u00f0ara.<\/p>\n

Verkefni\u00f0 var unni\u00f0 \u00ed samstarfi vi\u00f0 N\u00fdsk\u00f6punarmi\u00f0st\u00f6\u00f0 \u00cdslands.<\/p>\n

Um doktorsefni\u00f0<\/strong><\/p>\n

Michael Juhl lauk meistarapr\u00f3fi \u00ed verkfr\u00e6\u00f0i fr\u00e1 Danmarks Tekniske Universitet (DTU) \u00e1ri\u00f0 2003. Hann hefur unni\u00f0 sem verkefnastj\u00f3ri vi\u00f0 t\u00e6kni\u00fer\u00f3un hj\u00e1 Alight Technologies A\/S og vinnur n\u00fa a\u00f0 ranns\u00f3knum \u00e1 notkun gervigreindar \u00ed lj\u00f3se\u00f0lisfr\u00e6\u00f0i hj\u00e1 N\u00fdsk\u00f6punarmi\u00f0st\u00f6\u00f0 \u00cdslands.<\/p>\n<\/div><\/div>","protected":false},"featured_media":1835,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_phd_date_start":"2018-10-05T14:00:00+00:00","_phd_date_end":"2018-10-05T16:00:00+00:00","_phd_location":"Askja Stofa 132","_phd_admission":"Allir velkomnir","_phd_thesis_title":"Skautunargreining me\u00f0 fylki \u00f6rloftneta","_phd_source_url":"https:\/\/gamli.hi.is\/vidburdir\/doktorsvorn_i_edlisfraedi_michael_juhl","_phd_source_node_id":"311834","_phd_source_type":"vidburdir","_phd_member_id":473,"footnotes":""},"phd_school":[101,93],"phd_discipline":[105],"class_list":["post-6088","phd_defence","type-phd_defence","status-publish","has-post-thumbnail","hentry","phd_school-raunvisindadeild","phd_school-verkfraedi-og-natturuvisindasvid","phd_discipline-phd-i-edlisfraedi"],"_links":{"self":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6088","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence"}],"about":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/types\/phd_defence"}],"version-history":[{"count":0,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6088\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media\/1835"}],"wp:attachment":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media?parent=6088"}],"wp:term":[{"taxonomy":"phd_school","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_school?post=6088"},{"taxonomy":"phd_discipline","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_discipline?post=6088"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}