Three-wavelength broadband soot pyrometry technique for axisymmetric flames

Soot temperature measurements in laminar flames are often performed through two-color broadband emission pyrometry (BEMI) or modulated absorption/emission (BMAE) techniques, using models to relate the ratio between flame intensities at two different wavelengths with soot temperature. To benefit from...

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Bibliographic Details
Published in:Optics letters 2021-06, Vol.46 (11), p.2654-2657
Main Authors: Cruz, Juan José, Escudero, Felipe, Álvarez, Emilio, Figueira da Silva, Luís Fernando, Carvajal, Gonzalo, Thomsen, María, Fuentes, Andrés
Format: Article
Language:English
Subjects:
Broadband
Color
Emission
Engineering Sciences
Error analysis
Flames
Noise reduction
Noise sensitivity
Pyrometry
Reactive fluid environment
Sensitivity analysis
Signal and Image processing
Soot
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Summary:Soot temperature measurements in laminar flames are often performed through two-color broadband emission pyrometry (BEMI) or modulated absorption/emission (BMAE) techniques, using models to relate the ratio between flame intensities at two different wavelengths with soot temperature. To benefit from wider spectral range and increase the accuracy of experimental estimation of soot temperature, this work proposes a new approach that uses three-color broadband images captured with a basic color camera. The methodology is first validated through simulations using numerically generated flames from the CoFlame code and then used to retrieve soot temperature in an experimental campaign. The experimental results show that using three-color and BEMI provides smoother reconstruction of soot temperature than two-color and BMAE when small disturbances exist in the measured signals due to a reduced experimental noise effect. A sensitivity analysis shows that the retrieved temperature from three-color BEMI is more resilient to variations on the ratio of measured signals than BMAE, which is confirmed by an error propagation analysis based on a Monte Carlo approach.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.424529