TY - JOUR AU - Ajtai, Tibor AU - Utry, Noémi AU - Pintér, Máté AU - Abdul, Rahman AU - Kurilla, Boldizsár AU - Sárossy, Gábor AU - Deák, László AU - Baladincz, Jenő AU - Raffai, Péter AU - Szabó, Gábor AU - Bozóki, Zoltán TI - The investigation of diesel soot emission using instrument combination of multi-wavelength photoacoustic spectroscopy and scanning mobility particle sizer JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 14 PY - 2024 PG - 11 SN - 2045-2322 DO - 10.1038/s41598-024-52832-8 UR - https://m2.mtmt.hu/api/publication/34552784 ID - 34552784 N1 - Department of Optics and Quantum Electronics, University of Szeged, 9. Dóm Square, Szeged, 6720, Hungary HUN-REN-SZTE Research Group for Photoacoustic Monitoring of Environmental Processes, Dóm ter 9, Szeged, 6720, Hungary MOL Ltd. Duna Refinery, Százhalombatta, 2440, Hungary Export Date: 22 February 2024 Correspondence Address: Rahman, A.; Department of Optics and Quantum Electronics, 9. Dóm Square, Hungary; email: rahman.abdul@szte.hu Funding details: Hungarian Scientific Research Fund, OTKA, OTKANKFI-138176 Funding text 1: This work was supported by the TKP 2020 (Project NKFIH-1279-2/2020); the Hungarian Scientific Research Foundation (Project OTKANKFI-138176). AB - The parallel measurements of wavelength dependent optical absorption, particle number size distribution have made by a multi wavelength photoacoustic spectrometer (4λ-PAS) and scanning mobility particle sizer (SMPS) respectively at different modes of a diesel engine using two different types of fuel. The thermal evolution of the emission was also investigated using posterior temperature treatment of emission. The bimodal size distribution of emitted particles at a set reference temperature has been observed regardless of the applied fuel at idle. However, the emitted particulate assembly had lognormal size distribution falls into the accumulation mode at all other defined engine modes and both fuel types. The total number- and volume concentration (TNC and TVC) showed retrograde tendency with the increasing torque and rpm independently of the applied fuel types. The TNC values decreased up to 50% for both fuels with engine operation changes from idle engine mode(em#1) to low engine mode(em#2). With further increase in torque and rpm of engine, the change in TNC is negligible. On the other hand, the TVC remains more or less the same for idle to low engine mode transition and increased more than 60% for high mode (em#3) transition. The Optical Absorption Coefficient (OAC) values measured at the operational wavelengths of the 4λ-PAS instrument decreased at all wavelengths with increasing rpm and torque. The wavelength dependency quantified by Aerosol Ängström Exponent (AAE) was applied here for qualitative analysis of the carbonaceous emission and showed decreased values towards the higher engine speed and torque output of the engine. The proposed technique can be used as real-time, precise and accurate measurement of light absorption by DPM aerosols, which opens up novel possibilities for the volatility and thermal evolution investigation of diesel emissions. LA - English DB - MTMT ER - TY - JOUR AU - Végh, Panna AU - Gulyás, G. AU - Huszár, Helga AU - Ajtai, Tibor AU - Szabó, Gábor AU - Szabó, Anna AU - Bozóki, Zoltán TI - Compensation of composition variation-induced sensitivity changes in gas phase photoacoustics JF - INFRARED PHYSICS & TECHNOLOGY J2 - INFRARED PHYS TECHN VL - 137 PY - 2024 PG - 8 SN - 1350-4495 DO - 10.1016/j.infrared.2023.105116 UR - https://m2.mtmt.hu/api/publication/34506400 ID - 34506400 AB - Infrared photoacoustic (PA) spectroscopy is a widely used technique to monitor trace gas concentration changes during industrial processes where the bulk composition may vary considerably. However, the PA signal is prone to changes in bulk composition, leading to relative uncertainties in measurements of up to 10%, due to the complex dependence of the sensitivity of a PA system (S) on the thermal and acoustic properties of the gas sample. A novel calibration and concentration calculation method is proposed to keep the relative accuracy of the PA measurements in the few percentages range even in case of large-scale composition variations. The main novelty of the proposed method is that it tackles the complex dependence of the PA system's sensitivity in a way that while it varies the resonance frequency of the calibration gas, it keeps the heat capacity ratio of calibration gases at a constant value. We prove that it determines the analyte's concentration with relative accuracy of about 1 %, even when the composition of the gas varies drastically. It rigorously compensates for the frequency and heat capacity ratio dependence of S and for the dependence of the half-width of the resonance curve of the PA cell on the thermal and acoustic properties of the gas. Although the reported demonstration measurements are executed in a relatively simple gas mixture, the proposed method has widespread applicability in high-precision monitoring. © 2024 The Authors LA - English DB - MTMT ER - TY - CONF AU - Szabó, Anna AU - Gombi, Csilla AU - Király, Csaba AU - Horváth, László AU - Huszár, Helga AU - Szabó, Gábor AU - Bozóki, Zoltán ED - Kónya, Zoltán ED - Csontné Kiricsi, Mónika TI - Felszín és légkör közötti ammónia és dinitrogén-oxid kicserélődés vizsgálata fotoakusztikus spektroszkópiával T2 - A Magyar Tudományos Akadémia Analítikai és Környezetkémiai Bizottságának 11. Környezetkémiai Szimpóziuma. (2023) SN - 9789633069547 PY - 2023 SP - - UR - https://m2.mtmt.hu/api/publication/34754831 ID - 34754831 LA - Hungarian DB - MTMT ER - TY - GEN AU - Hodovány, Szabolcs AU - Ajtai, Tibor AU - Martin, Schnaiter AU - Szabó, Gábor AU - Bozóki, Zoltán TI - Soot selective size distribution measurement using PhotoAcoustic Spectroscopy (PAS). A demonstrative study PY - 2023 UR - https://m2.mtmt.hu/api/publication/34720564 ID - 34720564 N1 - Poszter LA - English DB - MTMT ER - TY - CONF AU - Horváth, László AU - Huszár, Helga AU - Zoltán, Nagy AU - Pintér, Krisztina AU - Szabó, Anna AU - Takács, Tünde Mária AU - Péter, Torma AU - Tóth, Eszter AU - Weidinger, Tamás AU - Bozóki, Zoltán TI - Application of a bi-directional ammonia exchange model for optimization of input parameters at a fertilized crop system; validation by flux measurements T2 - EGU General Assembly 2023: Abstracts PB - European Geosciences Union (EGU) C1 - München PY - 2023 DO - 10.5194/egusphere-egu23-5854 UR - https://m2.mtmt.hu/api/publication/34171639 ID - 34171639 LA - English DB - MTMT ER - TY - GEN AU - Szabó, Anna AU - Torma, Péter AU - Gombi, Csilla AU - Horváth, László AU - Huszár, Helga AU - Weidinger, Tamás AU - Szabó, Gábor AU - Bozóki, Zoltán TI - Gázmintavételezés nélküli fotoakusztikus rendszerek légköri ammónia- és vízgőzfluxus mérésekhez PY - 2023 UR - https://m2.mtmt.hu/api/publication/34146195 ID - 34146195 LA - English DB - MTMT ER - TY - CONF AU - László, Horváth AU - Csilla, Gombi AU - Huszár, Helga AU - Zoltán, Nagy AU - Pintér, Krisztina AU - Szabó, Anna AU - Takács, Tünde Mária AU - Péter, Torma AU - Tóth, Eszter AU - Tamás, Weidinger AU - Szabó, Gábor AU - Bozóki, Zoltán TI - Developing a method to estimate the ammonia loss from fertilized cropland and the part of soil emission recaptured by the canopy, applying field scale bidirectional models and flux measurements T2 - EMS Annual Meeting Abstracts PY - 2023 DO - 10.5194/ems2023-145 UR - https://m2.mtmt.hu/api/publication/34145954 ID - 34145954 LA - English DB - MTMT ER - TY - CONF AU - Torma, Péter AU - Weidinger, Tamás AU - Juhász, Viktor AU - Molnár, Bence AU - Horváth, László AU - Huszár, Helga AU - Bozóki, Zoltán TI - Application of open photoacoustic cell in an eddy covariance system for water vapor flux measurement T2 - EGU General Assembly 2023: Abstracts PB - European Geosciences Union (EGU) C1 - München PY - 2023 DO - 10.5194/egusphere-egu23-12898 UR - https://m2.mtmt.hu/api/publication/33938284 ID - 33938284 LA - English DB - MTMT ER - TY - JOUR AU - Ajtai, Tibor AU - Hodovány, Szabolcs AU - Schnaiter, M. AU - Szabó, Gábor AU - Bozóki, Zoltán TI - Absorption based size characterisation of aerosol by using photoacoustic spectroscopy JF - ATMOSPHERIC ENVIRONMENT J2 - ATMOS ENVIRON VL - 304 PY - 2023 PG - 5 SN - 1352-2310 DO - 10.1016/j.atmosenv.2023.119772 UR - https://m2.mtmt.hu/api/publication/33804983 ID - 33804983 N1 - Department of Optics and Quantum Electronics, University of Szeged, Szeged, H-6720, Hungary ELKH-SZTE Research Group for Photoacoustic Monitoring of Environmental Processes, Dóm tér 9H-6720, Hungary Institut für Meteorologie und Klimaforschung, Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany Export Date: 9 May 2023 CODEN: AENVE Correspondence Address: Ajtai, T.; Department of Optics and Quantum Electronics, Hungary; email: ajtai@titan.physx.u-szeged.hu Funding details: NKFIH-1279-2/2020 Funding details: Hungarian Scientific Research Fund, OTKA, OTKA NKFI-138176 Funding details: Helmholtz Association Funding text 1: This work was supported by the TKP 2020 (project NKFIH-1279-2/2020 ); the Hungarian Scientific Research Foundation (project OTKA NKFI-138176 ); and within the Research Program “Changing Earth - Sustaining our Future” of the German Helmholtz Association. AB - The size of the atmospheric soot is a critical parameter in many perspectives starting from climate impact through health relevance ended with air quality regulations. In this study, we propose a novel methodology for soot selective size measurement of atmospheric aerosol. The proposed method is based on the synergy of selectivity of the aerosol photoacoustic (PA) spectroscopy for highly absorbing atmospheric components and size dependency of the measured phase of the PA signal. The proposed experimental set-up is based on the instrument combination of 4λ-PAS and scanning mobility particle sizer (SMPS) in a closed loop arrangement. We experimentally demonstrated here, first that the PA phase of the photoacoustic signal depends on the characteristic size of the soot aerosol. In order to better understand the effect of morphology, nigrosine particles with spherical shape are also studied. The comparison of the measured data and the theoretical calculation is also investigated. Comparison of the theoretical simulation and the measured data shows increasing differences towards the higher size of the measured aerosol in all samples. We also demonstrated that the inherent system phase is independent of the phase shift related to particles. © 2023 LA - English DB - MTMT ER - TY - JOUR AU - Ouma, Emily Awuor AU - Huszár, Helga AU - Horváth, László AU - Szabó, Gábor AU - Bozóki, Zoltán TI - Possible environmental applications of a recently developed ammonia isotope monitoring photoacoustic system JF - IDŐJÁRÁS / QUARTERLY JOURNAL OF THE HUNGARIAN METEOROLOGICAL SERVICE J2 - IDŐJÁRÁS VL - 127 PY - 2023 IS - 1 SP - 43 EP - 53 PG - 11 SN - 0324-6329 DO - 10.28974/idojaras.2023.1.3 UR - https://m2.mtmt.hu/api/publication/33702561 ID - 33702561 N1 - Department of Optics and Quantum Electronics, University of Szeged, Dóm tér 9, Szeged, H-6720, Hungary ELKH-SZTE Research Group for Photoacoustic Monitoring of Environmental Processes, Dóm tér 9, Szeged, H-6720, Hungary Export Date: 13 April 2023 Correspondence Address: Horváth, L.; Department of Optics and Quantum Electronics, Dóm tér 9, Hungary; email: horvathl@titan.physx.u-szeged.hu Funding details: Hungarian Scientific Research Fund, OTKA, K-138176 Funding details: Magyar Tudományos Akadémia, MTA Funding details: Tempus Közalapítvány, TPF Funding text 1: Acknowledgements: Emily Awuor Ouma wishes to acknowledge the Tempus Public Foundation for the award of the Stipendium Hungaricum Scholarship, which enabled and provided the platform to be able to carry out this research. This work was supported by the Hungarian Research and Technology Innovation Fund (OTKA), project no. K-138176, and the Sustainable Development and Technologies Programme of the Hungarian Academy of Sciences (FFT NP FTA). AB - Ammonia is one of the most significant environmental pollutants. Concentration measurements, identifying the sources and studying the transformations in the biosphere are essential, and they are the focus of many investigations. The near-infrared (≈1530 nm) photoacoustic method for simultaneous and selective determination of 14NH3/15NH3 isotopologues reported here can be suitable for monitoring these phenomena and processes. So far, the photoacoustic method has not been used for this kind of examination. The application of our measurement method makes it possible to eliminate the disadvantages of the previous measurement methods. The detection limit of the PA system is 0.14 ppm and 0.73 ppm for 14NH3 and 15NH3, respectively, which can be improved by orders of magnitude with further development of sampling and measurement techniques. LA - English DB - MTMT ER -