Please use this identifier to cite or link to this item: http://hdl.handle.net/11717/11477
Title: 1D high-speed Rayleigh measurements in turbulent flames
Authors: Bork, B .
Bohm, B .
Heeger, C .
Chakravarthy, S.R .
Dreizler, A.
Keywords: Achromatic lens
CMOS camera
Combustion pro-cess
Correlated sampling
Experimental setup
High quality
High speed imaging
High-speed
Inherent frequencies
Jet flames
ND : YAG lasers
Objective lens
Rayleigh
Repetition rate
Signal intensities
System characteristics
Turbulent flame
Data handling
Laser excitation
Lenses
Neodymium lasers
Optical instruments
Reynolds number
Signal to noise ratio
Temperature measurement
Combustion
Issue Date: 2010
Citation: Applied Physics B: Lasers and Optics, 101(3), 487-491
Abstract: Time-correlated sampling of quantities in transient combustion processes requires high-speed imaging at repetition rates in the order of typical flame-inherent frequencies. The present study demonstrates the feasibility of temperature measurements in turbulent flames along a line at 10 kHz using Rayleigh scattering. High signal intensities were gained using an 80 W Nd:YAG laser for excitation in combination with an optimized combination of an achromatic lens, an objective lens and a CMOS camera. This allowed achieving signal-to-noise ratios up to 140 at 10 kHz repetition rates. The experimental setup and data processing aspects are described as well as details on the system characteristics are given. Temperature measurements of the DLR-A jet flame with a Reynolds number of 15.200 were compared with high-quality conventional 10 Hz simultaneous Raman/Rayleigh data. The data showed excellent agreement highlighting the reliability of the here demonstrated technique. � 2010 Springer-Verlag.
URI: http://dx.doi.org/10.1007/s00340-010-4262-9
http://hdl.handle.net/11717/11477
ISSN: 9462171
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