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Measurements of the characteristic lengths of smoke detectors

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Abstract

The dynamic performance of point-type smoke detectors is described by a simple model including two independent parameters, the static response threshold, and the characteristic length of the detector. An experimental system with constant rate of increase of smoke density under varying velocity conditions is used to determine the model parameters.

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Abbreviations

k :

constant smoke density gradient (dB/m/s)

L :

characteristic length of the detector (m)

m i :

smoke density inside the detector (dB/m)

m o :

smoke density outside the detector (dB/m)

m or :

measured smoke density at response (dB/m)

m r :

response threshold of the detector (dB/m)

t :

time(s)

v :

gas flow velocity at the detector (m/s)

τ:

time constant(s)

References

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Authors and Affiliations

  1. Technical Research Centre of Finland Fire Technology Laboratory, VTT, Espoo, Finland

    Björkman J., Kokkala M. A. & Ahola H.

Authors
  1. Björkman J.
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  2. Kokkala M. A.
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  3. Ahola H.
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Björkman, J., Kokkala, M.A. & Ahola, H. Measurements of the characteristic lengths of smoke detectors. Fire Technol 28, 99–106 (1992). https://doi.org/10.1007/BF01857936

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