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The spatial distribution of the material\u2019s thermal phase is monitored with an infrared camera, which is locked into the frequency of a modulated laser used to heat the material. This phase distribution is then fit with a thermal model, in which properties such as thermal conductivity are extracted as fit parameters. This approach enables non-contact, front-side measurements, which are insensitive to surface roughness. The technique does not strictly require the application of a transducer layer, but we highlight the practical benefits of applying a removable adhesive layer to serve as a near-surface absorber. We demonstrate the efficacy of the method by measuring materials with thermal conductivities that span more than three orders of magnitude (\u223c1 to &amp;gt;2000\u00a0W m\u22121 K\u22121).<\/jats:p>","DOI":"10.1063\/5.0346125","type":"journal-article","created":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T12:35:51Z","timestamp":1790685351000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Lock-in infrared thermography: Phase analysis for rapid, wide-range thermal conductivity measurements"],"prefix":"10.1063","volume":"97","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8523-7282","authenticated-orcid":false,"given":"Ethan A.","family":"Scott","sequence":"first","affiliation":[{"name":"Department of Mechanical and Aerospace Engineering, University of Virginia 1 , Charlottesville, Virginia 22904,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-0056-667X","authenticated-orcid":false,"given":"Jeffrey L.","family":"Braun","sequence":"additional","affiliation":[{"name":"Laser Thermal Analysis, Inc. 2 , 937 2nd St SE, Charlottesville, Virginia 22902,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-8850-2801","authenticated-orcid":false,"given":"Jessica","family":"Reyes","sequence":"additional","affiliation":[{"name":"Department of Mechanical and Aerospace Engineering, University of Virginia 1 , Charlottesville, Virginia 22904,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-0928-3551","authenticated-orcid":false,"given":"Bruce","family":"Bolliger","sequence":"additional","affiliation":[{"name":"Element Six Technologies US Corp 3 ., Santa Clara, California 95054,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-3325-0069","authenticated-orcid":false,"given":"Terrence","family":"Soares","sequence":"additional","affiliation":[{"name":"Element Six Technologies US Corp 3 ., Santa Clara, California 95054,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8622-5902","authenticated-orcid":false,"given":"John T.","family":"Gaskins","sequence":"additional","affiliation":[{"name":"Laser Thermal Analysis, Inc. 2 , 937 2nd St SE, Charlottesville, Virginia 22902,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2388-2937","authenticated-orcid":false,"given":"Marko J.","family":"Tadjer","sequence":"additional","affiliation":[{"name":"US Naval Research Laboratory 4 , Washington, District of Columbia 20375,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3403-743X","authenticated-orcid":false,"given":"Patrick E.","family":"Hopkins","sequence":"additional","affiliation":[{"name":"Department of Mechanical and Aerospace Engineering, University of Virginia 1 , Charlottesville, Virginia 22904,","place":["USA"]},{"name":"Laser Thermal Analysis, Inc. 2 , 937 2nd St SE, Charlottesville, Virginia 22902,","place":["USA"]},{"name":"Department of Materials Science and Engineering, University of Virginia 5 , Charlottesville, Virginia 22904,","place":["USA"]},{"name":"Department of Physics, University of Virginia 6 , Charlottesville, Virginia 22904,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2026,9,29]]},"reference":[{"key":"2026092908354365000_c1","doi-asserted-by":"publisher","first-page":"37","DOI":"10.1146\/annurev-matsci-080423-010435","volume":"55","year":"2025","journal-title":"Annu. 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