Optical and laser diagnostics: The versatility of Imaging

Research output: ThesisDoctoral Thesis (compilation)

Abstract

Optical and laser diagnostics is a field where optical techniques are developed that offer remote, non-intrusive measurements in order to characterise a system. Imaging is a big part of this field and the versatility it offers makes it a great tool in the hands of researchers and in practical applications. In this thesis, multiple applications of imaging are presented, together with possible data processing routines that are used to obtain qualitative and quantitative information. Intuitive ways of presenting big datasets along with trends and variations in them are shown, for both, time-resolved and single-shot measurements. Efforts to enhance the efficiency of internal combustion engines are discussed and a study on the interaction of spray jets and prevailing combustion in light-duty diesel engines is shown. A thorough optical investigation of methanol combustion in compression ignition engines is presented, along with a characterisation of the injection process and fuel distribution for methanol inside a heavy-duty optical engine. The potential of methanol as a renewable fuel and energy carrier is discussed in a wider perspective, together with demonstrating the benefits of such a propulsion system. In addition, a study of exhaled respiratory particles is presented, in an attempt to characterise the potential for transmission of diseases through the respiratory tract. This consisted of an evaluation of everyday tasks such as talking and singing, which is not commonly found in the literature as most studies are focused on sneezing and coughing. Finally, a novel approach on Background Oriented Schlieren, known as Laser Speckle-based BOS, is presented together with some preliminary results. There is great potential for this technique to be used in combustion engine diagnostics, as it requires minimal optical access to create the pattern and the sensitivity of the setup relies less on the distance of the subject to the background pattern.

Details

Authors
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Sciences
  • Mechanical Engineering

Keywords

  • methanol, COMBUSTION, diesel, schlieren, spray, imaging, pilot-injection, high-speed imaging, Fysicumarkivet A:2021:Matamis
Original languageEnglish
QualificationDoctor
Supervisors/Assistant supervisor
Award date2021 May 28
Place of PublicationLund
Publisher
  • Department of Physics, Lund University
Print ISBNs978-91-7895-879-5
Electronic ISBNs978-91-7895-880-1
Publication statusPublished - 2021 Apr 20
Publication categoryResearch

Bibliographic note

Defence details Date: 2021-05-28 Time: 09:00 Place: Lecture hall Rydbergsalen, Department of Physics, Professorsgatan 1, Faculty of Engineering LTH, Lund University, Lund. Zoom: https://lu-se.zoom.us/j/66686710055?pwd=RU9zTG1Md3BsQVZoRkg5aWdjeUdQdz09 Passcode: 2020 External reviewer(s) Name: Pastor, José Vicente Title: Prof. Affiliation: The Polytechnic University of Valencia, Spain. ---

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Related research output

Alexios Matamis, Sara Lonn, Ludovica Luise, Bianca Maria Vaglieco, Martin Tuner, Oivind Andersson, Marcus Alden & Mattias Richter, 2021, In: Proceedings of the Combustion Institute. 38, 4, p. 5509-5517 9 p.

Research output: Contribution to journalArticle

M. Alsved, A. Matamis, R. Bohlin, M. Richter, P. E. Bengtsson, C. J. Fraenkel, P. Medstrand & J. Löndahl, 2020 Sep 17, In: Aerosol Science and Technology. 54, 11, p. 1245-1248 4 p.

Research output: Contribution to journalLetter

Alexios Matamis, Sara Lonn, Martin Tuner, Oivind Andersson & Mattias Richter, 2020 Sep 15, SAE Powertrains, Fuels & Lubricants Meeting. 2020 ed. Society of Automotive Engineers, 2020-01-2109. (SAE Technical Papers).

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding

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