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Wyszukujesz frazę "Absorption spectroscopy" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Reduction of optical noise in near-infrared range laser hygrometry
    Autorzy:
    Stacewicz, Tadeusz
    Winkowski, Mateusz
    Kuk, Natalia
    Powiązania:
    https://bibliotekanauki.pl/articles/2204345.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hygrometer
    laser
    absorption spectroscopy
    optical interference
    Opis:
    A contactless laser hygrometer based on light absorption by H2O molecules at 1392.5 nm is described. However, measurement results can be affected by optical noise when applied to an atmospheric tunnel or glass cuvette. The noises (occurring in the form of periodic fringes in the recorded spectrum) come from unexpected interference of the light beams reflected from surfaces of the windows or other optical elements. The method of their suppression is described in this article. It is based on wavelength modulation and signal averaging over the fringes period. Also, an experiment confirming the usefulness of this method is described here.
    Źródło:
    Metrology and Measurement Systems; 2023, 30, 1; 169--181
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving the accuracy of the NDIR-based CO2 sensor for breath analysis
    Autorzy:
    Prokopiuk, Artur
    Bielecki, Zbigniew
    Wojtas, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2052156.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    NDIR
    CO2 sensors
    breath analysis
    absorption spectroscopy
    Opis:
    The paper presents an analysis and practical study of the temperature and pressure influence on a non-dispersive infrared (NDIR) sensor for measuring the concentration of carbon dioxide in human breath. This sensor is used for monitoring patients’ carbon dioxide (CO2) in the exhaled air. High precision and accuracy of CO2 concentration measurements are essential in air sampling systems for breath analysers. They, however, require an analysis of the influence of the human exhaled air pressure and temperature on the NDIR CO2 sensor. Therefore, analyses of the changes in concentration were carried out at a pressure from 986 mbar to 1027 mbar and a temperature from 20°C to 36°C. Finally, corresponding correction coefficients were determined which allow to reduce the relative uncertainty of CO2 sensor measurements results from 19% to below 5%.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 4; 803-812
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    System of Optoelectronic Sensors for Breath Analysis
    Autorzy:
    Mikołajczyk, J.
    Wojtas, J.
    Bielecki, Z.
    Stacewicz, T.
    Szabra, D.
    Magryta, P.
    Prokopiuk, A.
    Tkacz, A.
    Panek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/221463.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    breath analyses
    biomarkers
    laser absorption spectroscopy
    CEAS
    MUPASS
    medical screening
    Opis:
    The paper describes an integrated laser absorption system as a potential tool for breath analysis for clinical diagnostics, online therapy monitoring and metabolic disorder control. The sensors operate basing on cavity enhanced spectroscopy and multi-pass spectroscopy supported by wavelength modulation spectroscopy. The aspects concerning selection of operational spectral range and minimization of interference are also discussed. Tests results of the constructed devices collected with reference samples of biomarkers are also presented. The obtained data provide an opportunity to analyse applicability of optoelectronic sensors in medical screening.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 3; 481-489
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection of Gaseous Compounds with Different Techniques
    Autorzy:
    Mikołajczyk, J.
    Bielecki, Z.
    Stacewicz, T.
    Smulko, J.
    Wojtas, J.
    Szabra, D.
    Lentka, Ł.
    Prokopiuk, A.
    Magryta, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/220919.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas sensors
    laser absorption spectroscopy
    CEAS
    MUPASS
    breath analyses
    medical screening
    Opis:
    Sensing technology has been developed for detection of gases in some environmental, industrial, medical, and scientific applications. The main tasks of these works is to enhance performance of gas sensors taking into account their different applicability and scenarios of operation. This paper presents the descriptions, comparison and recent progress in some existing gas sensing technologies. Detailed introduction to optical sensing methods is presented. In a general way, other kinds of various sensors, such as catalytic, thermal conductivity, electrochemical, semiconductor and surface acoustic wave ones, are also presented. Furthermore, this paper focuses on performance of the optical method in detecting biomarkers in the exhaled air. There are discussed some examination results of the constructed devices. The devices operated on the basis of enhanced cavity and wavelength modulation spectroscopies. The experimental data used for analyzing applicability of these different sensing technologies in medical screening. Several suggestions related to future development are also discussed.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 2; 205-224
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of quantum cascade lasers to trace gas detection
    Autorzy:
    Bielecki, Z.
    Stacewicz, T.
    Wojtas, J.
    Mikołajczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/201703.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    absorption spectroscopy
    biomarkers
    sensors
    gas sensors
    cavity enhanced spectroscopy
    photoacoustic spectroscopy
    spektroskopia absorpcyjna
    biomarkery
    czujniki gazu
    spektroskopia wzmocniona
    spektroskopia fotoakustyczna
    Opis:
    The potential of Quantum Cascade Laser technology has been recently harnessed in industry, medicine and military to create a range of original infrared gas sensors. These sensors have opened up many new applications due to compact size, excellent sensitivity, robust construction and low power requirements. They rely on infrared absorption spectroscopy to determine identity and quantity of gases. The measurement of these gases has relied on different technologies including multi-pass spectroscopy, photoacoustic spectroscopy, cavity ring down spectroscopy, and their various modifications. In this review paper some technologies are described in terms of its advantages/disadvantages in many application. The results of own works about methane, ammonia, nitric oxide, nitrous oxide, and carbonyl sulfide detection are presented as well.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 515-525
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Properties of Particles Emitted from Selected Coal-Fired Heating Plants and Electric Power Stations in Poland : Preliminary Results
    Autorzy:
    Pastuszka, J.S.
    Konieczyński, J.
    Talik, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/205429.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    particulates emission
    coal-fired power
    heating station
    surface chemical composition
    X-ray
    photoelectron spectroscopy
    XPS
    specific absorption
    Opis:
    The surface properties of particles emitted from six selected coal-fired power and heating plants in Poland have been studied in this work for the first time. Samples were collected beyond the control systems. Surface composition of the size-distributed particles was obtained by photoelectron spectroscopy (XPS). The reflection of the smallest, submicron particles was also measured to calculate their specific/mass absorption. The surface layer of the emitted particles was clearly dominated by oxygen, followed by silicon and carbon. The sum of the relative concentration of these elements was between 85.1% and 91.1% for coarse particles and 71.8–93.4% for fine/submicron particles. Aluminum was typically the fourth or fifth, or at least the sixth most common element. The mass absorption of the submicron particles emitted from the studied plants ranged from 0.02 m2g-1 to 0.03 m2g-1. Only specific absorption obtained for the “Nowy Wirek” heating plant was significantly higher than in other studied plants probably because the obsolete fire grate is used in this heating plant. The obtained results suggest that the power/heating-plant-emitted fine particles contain less carbonaceous material/elemental carbon on their surfaces than those that are typical in urban air.
    Źródło:
    Archives of Environmental Protection; 2014, 40, 3; 13-27
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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