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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">zhps</journal-id><journal-title-group><journal-title xml:lang="ru">Журнал прикладной спектроскопии</journal-title><trans-title-group xml:lang="en"><trans-title>Zhurnal Prikladnoii Spektroskopii</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0514-7506</issn><publisher><publisher-name>B. I. Stepanov Institute of Physics of the National Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">zhps-320</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>Статьи</subject></subj-group></article-categories><title-group><article-title>БЫСТРОЕ ОПРЕДЕЛЕНИЕ ОПТИЧЕСКИХ КОНСТАНТ И ТОЛЩИНЫ ТОНКИХ ЖИДКОСТНЫХ ОБРАЗЦОВ МЕТОДОМ ТЕРАГЕРЦОВОЙ СПЕКТРОСКОПИИ С ВРЕМЕННЫМ РАЗРЕШЕНИЕМ</article-title><trans-title-group xml:lang="en"><trans-title>FAST DETERMINATION OF OPTICAL CONSTANTS AND SAMPLE THICKNESS OF THIN LIQUID SAMPLES IN TERAHERTZ TIME-DOMAIN SPECTROSCOPY</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>Yang</surname><given-names>F. .</given-names></name><name name-style="western" xml:lang="en"><surname>Yang</surname><given-names>F. .</given-names></name></name-alternatives><email xlink:type="simple">yfl8610@mail.ustc.edu.cn</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>Liu</surname><given-names>L. -P.</given-names></name><name name-style="western" xml:lang="en"><surname>Liu</surname><given-names>L. -P.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Song</surname><given-names>M. -J.</given-names></name><name name-style="western" xml:lang="en"><surname>Song</surname><given-names>M. -J.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</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>Zhang</surname><given-names>F. .</given-names></name><name name-style="western" xml:lang="en"><surname>Zhang</surname><given-names>F. .</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Гуйчжоуский институт метрологии</institution></aff><aff xml:lang="en"><institution>Guizhou Institute of Metrology</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Школа фармации, Технологический институт Гуйчжоу</institution></aff><aff xml:lang="en"><institution>School of Pharmacy Engineering, Guizhou Institute of Technology</institution></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Гуйянский профессионально-технический колледж</institution></aff><aff xml:lang="en"><institution>Guiyang Vocational and Technical College</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2018</year></pub-date><pub-date pub-type="epub"><day>10</day><month>03</month><year>2020</year></pub-date><volume>85</volume><issue>5</issue><fpage>790</fpage><lpage>795</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Yang F..., Liu L.-., Song M.-., Zhang F..., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Yang F..., Liu L.-., Song M.-., Zhang F...</copyright-holder><copyright-holder xml:lang="en">Yang F..., Liu L.-., Song M.-., Zhang F...</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://zhps.ejournal.by/jour/article/view/320">https://zhps.ejournal.by/jour/article/view/320</self-uri><abstract><p>С использованием терагерцовой спектроскопии с временным разрешением и особенностей тонких жидкостных образцов предложен трехмерный алгоритм оптимизации, позволяющий одновременно получать оптические константы и толщину образца при значительном сокращении времени вычислений. Измерены терагерцовые сигналы слоя воды толщиной 200 мкм в кювете с известными параметрами. С помощью разработанного алгоритма определены его толщина и оптические константы воды с высокой точностью, что подтвердило эффективность предложенного подхода.</p></abstract><trans-abstract xml:lang="en"><p>The accuracy of the extracted optical constants by terahertz time domain spectroscopy critically depends on the accuracy of the sample thickness. However, due to the large number of optimization steps, it is time consuming to extract the optical constants over a broad frequency range and determine the sample thickness simultaneously using conventional algorithms. With particular emphasis on thin liquid samples, a three-dimensional optimization algorithm was used to obtain the optical constants and sample thickness simultaneously , significantly reducing the calculation time. In the experiments, the THz signals of 200-mm-thick water in a known cuvette were measured, and its accurate thickness and optical constants were determined by the algorithm, validating the effectiveness of the approach.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>терагерцовая спектроскопия с временным разрешением</kwd><kwd>Фабри</kwd><kwd>Перо</kwd><kwd>оптические константы</kwd><kwd>terahertz time domain spectroscopy</kwd><kwd>Fabry-Perot</kwd><kwd>optical constants</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">J. L. Duvillaret, F. Garet, J.-L. Coutaz, Appl. Opt., 38, 409-415 (1999).</mixed-citation><mixed-citation xml:lang="en">J. L. Duvillaret, F. Garet, J.-L. Coutaz, Appl. Opt., 38, 409-415 (1999).</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">T. Dorney, R. Baraniuk, D. 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