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Analyse und Optimierung der bildgebenden Signalerfassung von gefilterter Rayleighstreuung

  • The aim of this thesis is to investigate and optimize the camera system which is used for Filtered Rayleigh Scattering (FRS) measurement systems. Theoretical considerations about the integration of interference filters explain state-of-the-art accuracy limitations. Based on that promising modifications of the established FRS system are presented: test results indicate that frequency fringes - artifacts distorting FRS scans - are minimized by positioning the spectral bandpass filter between camera and first lens. As a tradeoff, the signal level decreases by 70 % to 75% depending on the beam path through the molecular filter. Furthermore, reference measurements without a bandpass filter account for a non-negligible iodine fluorescence background of about 1% of typical signal levels. All things considered following these results FRS systems can now be systematically optimized towards specific measurement tasks.

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Document Type:Bachelor Thesis
Author:Joshua Jungmann
Number of pages:65
Referee:Alejandro Valenzuela
Publisher:elib DLR
Date of first publication:2017/09/07
Keyword:Gefilterte Rayleighstreuung; Laseroptische Strömungsmesstechnik; Optische Systemauslegung
Dewey Decimal Classification (DDC):6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Theses, student research papers:Hochschule Bonn-Rhein-Sieg / Fachbereich Elektrotechnik, Maschinenbau und Technikjournalismus
Entry in this database:2020/07/07