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Hybrid Endoscopes for Laser-Based Imaging Diagnostics in IC Engines
Technical Paper
2009-01-0655
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Laser-based in-cylinder diagnostics are well established in engine research. The requirement of large-scale optical accesses, however, makes the application expensive and time consuming. It furthermore limits the engine operation range to low loads and speeds. We introduce laser excitation and imaging optics with a minimal outer diameter of 10 mm (imaging optic) respectively 9 mm (excitation optics). The imaging optics allow the observation of a 30×30 mm2 field with a working distance of 35-42 mm. In order to increase the optical performance diffractive elements are integrated. These elements provide great flexibility for the excitation beam shaping and help to reduce aberrations in the imaging system with a light throughput comparable to imaging setups with standard large-scale UV optics at the same image magnification. We present this miniaturized diagnostic technique based on fuel tracers for measuring fuel density, equivalence ratio and temperature in IC engines. A two-color detection scheme is applied for oxygen concentration measurements in gas jets and a flow-tagging approach for measuring flow velocities is demonstrated. Additionally, chemiluminescence and fuel concentration measurements in a production engine are presented. Finally, first results of an endoscopic LIF-based in-cylinder temperature measurement are shown.
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Authors
- Christopher Gessenhardt - IVG, University of Duisburg-Essen
- Frank Zimmermann - IVG, University of Duisburg-Essen
- Christof Schulz - IVG, University of Duisburg-Essen
- René Reichle - ITO, University of Stuttgart
- Christof Pruss - ITO, University of Stuttgart
- Wolfgang Osten - ITO, University of Stuttgart
Topic
Citation
Gessenhardt, C., Zimmermann, F., Schulz, C., Reichle, R. et al., "Hybrid Endoscopes for Laser-Based Imaging Diagnostics in IC Engines," SAE Technical Paper 2009-01-0655, 2009, https://doi.org/10.4271/2009-01-0655.Also In
Combustion and Flow Diagnostics and Fundamental Advances in Thermal and Fluid Sciences, 2009
Number: SP-2238; Published: 2009-04-20
Number: SP-2238; Published: 2009-04-20
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