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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">donstu</journal-id><journal-title-group><journal-title xml:lang="en">Advanced Engineering Research (Rostov-on-Don)</journal-title><trans-title-group xml:lang="ru"><trans-title>Advanced Engineering Research (Rostov-on-Don)</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2687-1653</issn><publisher><publisher-name>Don State Technical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.23947/2687-1653-2022-22-2-161-168</article-id><article-id custom-type="elpub" pub-id-type="custom">donstu-1887</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>INFORMATION TECHNOLOGY, COMPUTER SCIENCE AND MANAGEMENT</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ИНФОРМАТИКА, ВЫЧИСЛИТЕЛЬНАЯ ТЕХНИКА И УПРАВЛЕНИЕ</subject></subj-group></article-categories><title-group><article-title>Self-reference Lock-in Thermography for Detecting Defects in Metal Bridge Spans</article-title><trans-title-group xml:lang="ru"><trans-title>Применение автокорреляционной инфракрасной термографии для выявления дефектов в элементах металлических пролетных строений</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8937-9170</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Соловьев</surname><given-names>А. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Solovyev</surname><given-names>A. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Соловьев Александр Леонидович, инженер Сибирского научно-исследовательского института Мостов</p><p>г. Новосибирск, ул. Дуси Ковальчук, 191</p></bio><bio xml:lang="en"><p>191, D. Kovalchuk St., Novosibirsk</p></bio><email xlink:type="simple">Alsolovyov1337@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8304-7784</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рояк</surname><given-names>М. Э.</given-names></name><name name-style="western" xml:lang="en"><surname>Royak</surname><given-names>M. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Рояк Михаил Эммануилович, профессор кафедры прикладной математики, доктор технических наук</p><p>г. Новосибирск, пр-т Карла Маркса, 20</p></bio><bio xml:lang="en"><p>20, Prospect K. Marksa, Novosibirsk</p></bio><email xlink:type="simple">mikeroyak@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Сибирский государственный университет путей сообщения</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Siberian Transport University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Новосибирский государственный технический университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Novosibirsk State Technical University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>11</day><month>07</month><year>2022</year></pub-date><volume>22</volume><issue>2</issue><fpage>161</fpage><lpage>168</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Solovyev A.L., Royak M.E., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Соловьев А.Л., Рояк М.Э.</copyright-holder><copyright-holder xml:lang="en">Solovyev A.L., Royak M.E.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.vestnik-donstu.ru/jour/article/view/1887">https://www.vestnik-donstu.ru/jour/article/view/1887</self-uri><abstract><sec><title>Introduction</title><p>Introduction. Incipient fatigue damage in the metal superstructures of bridges creates certain threats to the safety of operation. Various methods of non-destructive testing are used for their timely detection and diagnosis. A modern and popular on-the-day solution is the method of infrared (IR) thermography. Due to the specifics of the operation of IR cameras, additional processing of recordings received from these cameras is required to obtain an accurate result. This work aims at presenting a method for processing thermofilms and describing the possibilities of its application under real conditions.</p></sec><sec><title>Materials and Methods</title><p>Materials and Methods. A method for processing thermographic films was described. It provided detecting temperature anomalies using only information from the camera. The results of its application on the elements of existing metal bridge spans are presented.</p></sec><sec><title>Results</title><p>Results. It is shown that there are temperature anomalies for existing defects. This means that the defects continue to develop, which was confirmed by subsequent observations of their condition. In addition, a case of temperature anomaly in the defect-free external region was identified. This might be a sign of an incipient defect that could not be diagnosed by other methods. If the presence of this defect is confirmed during repeated examinations, it will be possible to diagnose hidden defects that have not yet come to the surface, and/or detect potentially collapsing places.</p><p>Discussion and Conclusions. The IR thermography performance as a method of non-contact non-destructive testing is shown, as well as its operability on real objects under random load.</p></sec></abstract><trans-abstract xml:lang="ru"><sec><title>Введение</title><p>Введение. Зарождающиеся усталостные повреждения в металлических пролетных строениях мостов создают определенные угрозы безопасности эксплуатации. Для их своевременного выявления и диагностики используются различные методы неразрушающего контроля. Современным и популярным решением на данный момент является метод инфракрасной (ИК) термографии. В силу особенности работы ИК-камер для получения точного результата требуется дополнительная обработка записей, полученных с этих камер. Цель данной работы — представить метод обработки термофильмов и показать возможности его применения в реальных условиях.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Приводится описание способа обработки термографических фильмов, позволяющего выявить температурные аномалии, используя только информацию с камеры. Приведены результаты его применения на элементах действующих металлических пролетных строений мостов.</p></sec><sec><title>Результаты исследования</title><p>Результаты исследования. Показано, что для существующих дефектов имеются температурные аномалии. Это означает, что дефекты продолжают развиваться, что подтвердилось последующими наблюдениями за их состоянием. Кроме этого был выявлен случай температурной аномалии в бездефектной внешней области. Это может быть признаком зарождающегося дефекта, который не мог быть продиагностирован другими методами. Если наличие этого дефекта будет подтверждено при повторных обследованиях, то представится возможность диагностирования скрытых дефектов, которые еще не вышли на поверхность, и/или обнаружения потенциально разрушающихся мест.</p></sec><sec><title>Обсуждение и заключения</title><p>Обсуждение и заключения. Показана эффективность ИК-термографии как метода бесконтактного неразрушающего контроля, а также его работоспособность на реальных объектах, находящихся под случайной нагрузкой.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>ИК-термография</kwd><kwd>неразрушающий контроль</kwd><kwd>усталостные трещины</kwd><kwd>металлические мосты</kwd><kwd>дефектность конструкций</kwd><kwd>ИК-камера</kwd></kwd-group><kwd-group xml:lang="en"><kwd>IR thermography</kwd><kwd>nondestructive testing</kwd><kwd>fatigue cracks</kwd><kwd>metal bridges</kwd><kwd>structural defects</kwd><kwd>IR camera</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Соловьев, Л. Ю. Новые технологии в обследовании мостов / Л. Ю. Соловьев, А. Л. 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