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Applied Optics

Research group Combustion diagnostics, exhaled breath gas analysis and chemical imaging.

We have an open PhD position in the group! Apply here. 

 

Sensitive detection and accurate quantification of atomic and molecular species is important in many fields of natural science, engineering and in industry. In the Applied Optics group we develop novel laser-based spectroscopic techniques and use them to conduct interdisciplinary research in fields such as energy technology, life science and medical science. The focus lies on fast in situ measurements of trace species and biomolecules.

Combustion diagnostics

In the quest for a more sustainable society, thermochemical conversion of biomass from forest or agricultural residues and waste can be used to replace fossil fuels in heat and power generation, as well as the production of transport fuels and chemicals. Rapid in situ diagnostics is needed to better understand, optimize and control high-temperature combustion and gasification processes. Our research focus lies on detection of major species, gas temperature, soot and inorganic compounds, such as potassium.

Key publications

1. E. Thorin, K. Zhang, D. Valiev, F. M. Schmidt, Simultaneous detection of K, KOH, and KCl in flames and released from biomass using photofragmentation TDLAS, Optics Express 29, 42945-42961 (2021), https://doi.org/10.1364/oe.446725

2. A. Sepman, Y. Ögren, Z. Qu, H. Wiinikka, F. M. Schmidt, Real-time in situ multi-parameter TDLAS sensing in the reactor core of an entrained-flow biomass gasifier, Proceedings of the Combustion Institute 36, 4541-4548 (2017), https://doi.org/10.1016/j.proci.2016.07.011   

3. Z. Qu, E. Steinvall, R. Ghorbani, F. M. Schmidt, Tunable diode laser atomic absorption spectroscopy for detection of potassium under optically thick conditions, Analytical Chemistry 88, 3754–3760 (2016), https://doi.org/10.1021/acs.analchem.5b04610

4. Z. Qu, R. Ghorbani, D. Valiev, F. M. Schmidt, Calibration-free scanned wavelength modulation spectroscopy – application to H2O and temperature sensing in flames, Optics Express 23, 16492-16499 (2015), https://doi.org/10.1364/oe.23.016492

Fast chemical imaging

Chemical imaging is an important tool in life science. We use and further develop mid-infrared photothermal microscopy for the analysis of living cells and microorganisms. We also use laser absorption imaging for the characterization of gaseous samples.

Key publications

1. E. Paiva and F. M. Schmidt, Ultrafast widefield mid-infrared photothermal heterodyne imaging, Analytical Chemistry (2022), https://doi.org/10.1021/acs.analchem.2c02548 

Real-time breath gas analysis

Breath gas analysis is a rapidly growing area of ​​research aiming at fast, non-invasive detection of biomarkers in exhaled breath relevant to medical diagnostics, physiology and toxicology. The method has the potential to revolutionize non-invasive point-of-care and personalized diagnostics. Further research is needed to develop analytical techniques for reliable quantification of the biomarker molecules, and to better understand their origin down to the cellular level. The current focus of our research is on real-time analysis of small gasotransmitter (signalling) molecules, such as carbon monoxide, and their role in respiratory diseases. 

Key publications

1. R. Ghorbani and F. M. Schmidt, Fitting of single-exhalation profiles using a pulmonary gas exchange model – application to carbon monoxide, Journal of Breath Research 13 026001 (2019), https://doi.org/10.1088/1752-7163/aafc91

2. R. Ghorbani, A. Blomberg, F. M. Schmidt, Modeling pulmonary gas exchange and single-exhalation profiles of carbon monoxide, Frontiers in Physiology 9 927 (2018), https://doi.org/10.3389/fphys.2018.00927

3. R. Ghorbani and F. M. Schmidt, ICL-based TDLAS sensor for real-time breath gas analysis of carbon monoxide isotopes, Optics Express 25, 12743-12752 (2017), https://doi.org/10.1364/OE.25.012743                

4. F. M. Schmidt, O. Vaittinen, M. Metsälä, M. Lehto, C. Forsblom, P.-H. Groop, L. Halonen, Ammonia in breath and emitted from skin, Journal of Breath Research 7, 017109 (2013), https://doi.org/10.1088/1752-7155/7/1/017109

Collaboration partners at Umeå University include the Thermochemical Energy Conversion Laboratory (TEC-Lab), the KBC-environment, the Department of Physics and the Department of Public Health and Clinical Medicine. Further collaborations are with e.g. RISE Piteå, Luleå University of Technology, Lund University, University of Helsinki, Tsinghua University, and the strategic research environment Bio4Energy.

Contact information

Department of Applied Physics and Electronics, TEC-Lab
KBC-building, Linnaeus väg 6                                                                  901 87 Umeå

Visiting Address
KBC-building, KB.G7, Room: 7.07.17

Former group members

Dr. Ramin Ghorbani, Scania, Sweden

Dr. Damir Valiev, Center for Combustion Energy, Tsinghua University, Beijing, China

Dr. Zhechao Qu, PTB Braunschweig, Germany

Research funding

Vetenskapsrådet - Swedish Research Council

Energimyndigheten- Swedish Energy Agency

Kempestiftelserna - The Kempe Foundations

SFO-Bio4Energy - Strategic Research Environment

Swedish Gasification Center

Related information

Thermochemical Energy Conversion Laboratory 

Publications

Publications

Combustion and Flame, Elsevier 2022, Vol. 237
Sepman, Alexey; Thorin, Emil; Ögren, Yngve; et al.
Proceedings of the Combustion Institute
Thorin, Emil; Sepman, Alexey; Ögren, Yngve; et al.
Analytical Chemistry, American Chemical Society (ACS) 2022, Vol. 94, (41) : 14242-14250
Maia Paiva, Eduardo; Schmidt, Florian
Applied Sciences, MDPI 2021, Vol. 11, (19)
Qu, Zhechao; Fatehi, Hesameddin; Schmidt, Florian
Optics Express, The Optical Society 2021, Vol. 29, (26)
Thorin, Emil; Zhang, Kun; Valiev, Damir; et al.
Journal of Breath Research, Institute of Physics Publishing (IOPP) 2020, Vol. 14, (4)
Ghorbani, Ramin; Blomberg, Anders; Schmidt, Florian M.
Breathborne biomarkers and the human volatilome, Elsevier 2020 : 221-238
Schmidt, Florian M.; Metsälä, Markus; Apolonski, Alexander; et al.
Breathborne biomarkers and the human volatilome, Elsevier 2020 : 43-62
King, Julian; Mochalski, Pawel; Teschl, Gerald; et al.
Optics Letters, Optical Society of America 2020, Vol. 45, (18) : 5230-5233
Thorin, Emil; Schmidt, Florian M.
Journal of Breath Research, Institute of Physics Publishing (IOPP) 2019, Vol. 13, (2)
Ghorbani, Ramin; Schmidt, Florian M.
Optics Express, Optical Society of America 2019, Vol. 27, (13) : 17940-17953
Zhao, Gang; Hausmaninger, Thomas; Schmidt, Florian M.; et al.
Optics Express, Optical Society of America 2019, Vol. 27, (21) : 29521-29533
Lu, Chuang; Vieira, Francisco Senna; Schmidt, Florian M.; et al.
Energy & Fuels, American Chemical Society (ACS) 2019, Vol. 33, (11) : 11795-11803
Sepman, Alexey; Ögren, Yngve; Qu, Zhechao; et al.
Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 205 : 213-219
Rutkowski, Lucile; Foltynowicz, Aleksandra; Schmidt, Florian M.; et al.
Combustion and Flame, New York: Elsevier 2018, Vol. 188 : 488-497
Qu, Zhechao; Holmgren, Per; Skoglund, Nils; et al.
Combustion and Flame, Elsevier 2018, Vol. 196 : 351-363
Fatehi, Hesameddin; Schmidt, Florian M.; Bai, Xue-Song
Applied physics. B, Lasers and optics (Print), Springer Berlin/Heidelberg 2018, Vol. 124, (8)
Henderson, Ben; Khodabakhsh, Amir; Metsälä, Markus; et al.
Frontiers in Physiology, Frontiers Media S.A. 2018, Vol. 9
Ghorbani, Ramin; Blomberg, Anders; Schmidt, Florian M.
Abstracts of Papers of the American Chemical Society, Vol. 254
Boman, Christoffer; Öhman, Marcus; Broström, Markus; et al.
Energy & Fuels, Washington: American Chemical Society (ACS) 2017, Vol. 31, (10) : 11328-11336
Ögren, Yngve; Sepman, Alexey; Qu, Zhechao; et al.
Optics Express, Optical Society of America 2017, Vol. 25, (11) : 12743-12752
Ghorbani, Ramin; Schmidt, Florian M.
Applied physics. B, Lasers and optics (Print), Springer 2017, Vol. 123, (5)
Ghorbani, Ramin; Schmidt, Florian M.
Proceedings of the Combustion Institute, Elsevier 2017, Vol. 36, (3) : 4541-4548
Sepman, Alexey; Ögren, Yngve; Qu, Zhechao; et al.
Environmental Science and Pollution Research, Vol. 23, (8) : 8141-8159
Weidemann, Eva; Andersson, Patrik L.; Bidleman, Terry; et al.
Photonics Letters of Poland, Vol. 8, (4) : 110-112
Rutkowski, Lucile; Johansson, Alexandra C.; Valiev, Damir; et al.
Analytical Chemistry, American Chemical Society (ACS) 2016, Vol. 88, (7) : 3754-3760
Qu, Zhechao; Steinvall, Erik; Ghorbani, Ramin; et al.
Optics Express, Vol. 23, (12) : 16492-16499
Qu, Zhechao; Ghorbani, Ramin; Valiev, Damir; et al.
Applied physics. B, Lasers and optics (Print), Vol. 119, (1) : 45-53
Qu, Zhechao; Schmidt, Florian M.
Optics Express, Vol. 22, (11) : 13889-13895
Abd Alrahman, Chadi; Khodabakhsh, Amir; Schmidt, Florian M.; et al.
Journal of Breath Research, Vol. 7, (1)
Schmidt, Florian; Vaittinen, Olavi; Metsälä, Markus; et al.

Head of research group

Florian Schmidt
Associate professor
E-mail
Email

Overview

Participating departments and units at Umeå University

Department of Applied Physics and Electronics

Research area

Energy engineering, Medical technology, Physical sciences
Ultra-fast photothermal imaging

New funds for the development of mid-infrared photothermal imaging