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| Hauptseite > Publikationsdatenbank > Assessing performance of LEDSA and Radiance method for measuring extinction coefficients in real-scale fire environments |
| Hauptseite > Publikationsdatenbank > Assessing performance of LEDSA and Radiance method for measuring extinction coefficients in real-scale fire environments |
| Journal Article | FZJ-2023-04016 |
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2023
Elsevier
New York, NY [u.a.]
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Please use a persistent id in citations: doi:10.1016/j.firesaf.2023.103929 doi:10.34734/FZJ-2023-04016
Abstract: Two photometric measurement methods (Radiance method and LEDSA) were compared against the established MIREX measurement apparatus under controlled laboratory conditions to assess their capability of measuring extinction coefficients in real-scale fires on a temporal and spatial scale. LEDSA is a tomographic technique based on direct measurements of light intensity from individual LEDs using commercially available DSLR cameras. By discretizing the domain into horizontal layers with homogeneous smoke density, values of the extinction coefficient can be computed using an inverse model based on Beer Lambert’s law. The Radiance method involves measuring the contrast of light and dark areas in images and/or video footage. It was originally developed to investigate the descent of the smoke layer in high-temperature fire events. In this work, the extinction coefficient was deduced from measurements on a contrast board by a straightforward analytical approach. Both methods were shown to yield similar extinction coefficient results in line with the MIREX for an EN 54-7 TF5 n-heptane fire. The Radiance method is able to generate accurate patterns but not values for a TF2 wood smouldering fire, while LEDSA is generally able to reflect the MIREX measurement values, yet requires higher computational effort.
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