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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="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">pribor</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Приборостроение</journal-title><trans-title-group xml:lang="en"><trans-title>Journal of Instrument Engineering</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0021-3454</issn><issn pub-type="epub">2500-0381</issn><publisher><publisher-name>Национальный исследовательский университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17586/0021-3454-2023-66-4-335-341</article-id><article-id custom-type="elpub" pub-id-type="custom">pribor-98</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="ru"><subject>ПРИБОРЫ И МЕТОДЫ КОНТРОЛЯ ПРИРОДНОЙ СРЕДЫ, ВЕЩЕСТВ, МАТЕРИАЛОВ И ИЗДЕЛИЙ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>INSTRUMENTS AND METHODS FOR MONITORING THE NATURAL ENVIRONMENT, SUBSTANCES, MATERIALS AND PRODUCTS</subject></subj-group></article-categories><title-group><article-title>Вопросы разработки оптоволоконного кюветного измерителя концентрации метана в воздухе в нефтегазовом производстве</article-title><trans-title-group xml:lang="en"><trans-title>Issues of developing a fiber-optic cuvette meter for the concentration of methane in the air in oil and gas industry</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Чобанзаде</surname><given-names>И. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Chobanzade</surname><given-names>I. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Имран Гора Оглы Чобанзаде - менеджер</p><p>Баку</p></bio><bio xml:lang="en"><p>Imran G. Chobanzade - Manager</p><p>Baku</p></bio><email xlink:type="simple">ichobanzada@slb.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бабаханов</surname><given-names>А. Э.</given-names></name><name name-style="western" xml:lang="en"><surname>Babakhanov</surname><given-names>A. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Имран Гора Оглы Чобанзаде — менеджер</p><p>Баку</p></bio><bio xml:lang="en"><p>Aslan E. Babakhanov - Post-Graduate Student</p><p>Baku</p></bio><email xlink:type="simple">babakhan2000@yahoo.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Национальное аэрокосмическое агентство Азербайджанской Республики</institution></aff><aff xml:lang="en"><institution>National Aerospace Agency of the Azerbaijan Republic</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Государственная нефтяная компания Азербайджанской Республики</institution></aff><aff xml:lang="en"><institution>State Oil Company of the Azerbaijan Republic</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>26</day><month>11</month><year>2024</year></pub-date><volume>66</volume><issue>4</issue><fpage>335</fpage><lpage>341</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Национальный исследовательский университет ИТМО, 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Национальный исследовательский университет ИТМО</copyright-holder><copyright-holder xml:lang="en">Национальный исследовательский университет ИТМО</copyright-holder><license xlink:href="https://pribor.ifmo.ru/jour/about/submissions#copyrightNotice" xlink:type="simple"><license-p>https://pribor.ifmo.ru/jour/about/submissions#copyrightNotice</license-p></license></permissions><self-uri xlink:href="https://pribor.ifmo.ru/jour/article/view/98">https://pribor.ifmo.ru/jour/article/view/98</self-uri><abstract><p>Статья посвящена разработке оптоволоконного кюветного измерителя концентрации метана в нефтегазовом производстве. Предметом исследования является разработка теоретических основ оптимизации конструкции такого измерителя, при которой основной режимный показатель измерителя достигает экстремальной величины. Цель работы заключается в исследовании возможности нахождения оптимальной взаимосвязи между основными режимными показателями, при которой выбранный критерий оптимизации достигает максимального значения. Составлена задача безусловной оптимизации, в которой дополнительно используемое условие присоединяется к функционалу оптимизации с помощью множителя Лагранжа. Получена такая форма функциональной связи между основными режимными показателями, при которой функционал цели достигает минимальной величины. Обнаруженная взаимосвязь между основными показателями охарактеризована как наихудшая, которой на практике следует избегать.  </p></abstract><trans-abstract xml:lang="en"><p>The article is devoted to the development of a fiber-optic cuvette meter of methane concentration at oil and gas enterprises. The subject of the study is the development of theoretical foundations for optimizing the design of such a meter in which the main operating indicator of the meter reaches an extreme value. The purpose of the work is to investigate the possibility of finding the optimal relationship between the main regime indicators, at which the selected optimization criterion reaches the maximum value. An unconstrained optimization problem is formulated, in which an additional condition is added to the optimization functional using the Lagrange multiplier. A form of functional connection between the main regime indicators has been obtained, in which the goal functional reaches a minimum value. The found relationship between the main indicators is characterized as the worst, which should be avoided in practice. </p></trans-abstract><kwd-group xml:lang="ru"><kwd>измеритель</kwd><kwd>концентрация</kwd><kwd>метан</kwd><kwd>кювета</kwd><kwd>оптимизация</kwd><kwd>функционал</kwd></kwd-group><kwd-group xml:lang="en"><kwd>meter</kwd><kwd>concentration</kwd><kwd>methane</kwd><kwd>cuvette</kwd><kwd>optimization</kwd><kwd>functional</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">Xian Q., Lv H., Yao Y., Cheng C., Zhou Z. Fabrication and application of 1653.7 nm methane sensor // IEEE Photonics journal. 2022. Vol. 14, N 5. October.</mixed-citation><mixed-citation xml:lang="en">Xian Q., Lv H., Yao Y., Cheng C., Zhou Z. Fabrication and application of 1653.7 nm methane sensor // IEEE Photonics journal. 2022. Vol. 14, N 5. 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