{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,24]],"date-time":"2026-04-24T07:43:49Z","timestamp":1777016629265,"version":"3.51.4"},"reference-count":47,"publisher":"MDPI AG","issue":"24","license":[{"start":{"date-parts":[[2020,12,10]],"date-time":"2020-12-10T00:00:00Z","timestamp":1607558400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004663","name":"Ministry of Science and Technology, Taiwan","doi-asserted-by":"publisher","award":["108-2628-E-002-007-MY3"],"award-info":[{"award-number":["108-2628-E-002-007-MY3"]}],"id":[{"id":"10.13039\/501100004663","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Bureau of Energy, Ministry of Economic Affairs, Taiwan","award":["109-D0106"],"award-info":[{"award-number":["109-D0106"]}]},{"name":"National Taiwan University, Taipei, Taiwan","award":["NTU-CDP-109L7725"],"award-info":[{"award-number":["NTU-CDP-109L7725"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this study, infrared thermography is used for vibration-based structural health monitoring (SHM). Heat sources are employed as sensors. An acrylic frame structure was experimentally investigated using the heat sources as structural marker points to record the vibration response. The effectiveness of the infrared thermography measurement system was verified by comparing the results obtained using an infrared thermal imager with those obtained using accelerometers. The average error in natural frequency was between only 0.64% and 3.84%. To guarantee the applicability of the system, this study employed the mode shape curvature method to locate damage on a structure under harsh environments, for instance, in dark, hindered, and hazy conditions. Moreover, we propose the mode shape recombination method (MSRM) to realize large-scale structural measurement. The partial mode shapes of the 3D frame structure are combined using the MSRM to obtain the entire mode shape with a satisfactory model assurance criterion. Experimental results confirmed the feasibility of using heat sources as sensors and indicated that the proposed methods are suitable for overcoming the numerous inherent limitations associated with SHM in harsh or remote environments as well as the limitations associated with the SHM of large-scale structures.<\/jats:p>","DOI":"10.3390\/s20247067","type":"journal-article","created":{"date-parts":[[2020,12,10]],"date-time":"2020-12-10T08:59:34Z","timestamp":1607590774000},"page":"7067","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Infrared Thermography Measurement for Vibration-Based Structural Health Monitoring in Low-Visibility Harsh Environments"],"prefix":"10.3390","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7596-9156","authenticated-orcid":false,"given":"Jia-Hao","family":"He","sequence":"first","affiliation":[{"name":"Department of Engineering Science and Ocean Engineering, National Taiwan University, Taipei 10617, Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8545-7207","authenticated-orcid":false,"given":"Ding-Peng","family":"Liu","sequence":"additional","affiliation":[{"name":"Ship and Ocean Industries R&amp;D Center, New Taipei City 251401, Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cheng-Hsien","family":"Chung","sequence":"additional","affiliation":[{"name":"Ship and Ocean Industries R&amp;D Center, New Taipei City 251401, Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2390-5166","authenticated-orcid":false,"given":"Hsin-Haou","family":"Huang","sequence":"additional","affiliation":[{"name":"Department of Engineering Science and Ocean Engineering, National Taiwan University, Taipei 10617, Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,12,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"65","DOI":"10.1016\/j.marstruc.2016.10.006","article-title":"An application of Structural Health Monitoring system based on FBG sensors to offshore wind turbine support structure model","volume":"51","author":"Mieloszyk","year":"2017","journal-title":"Mar. 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