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Experimental Studies of Electromagnetic Wave Attenuation by Flame and Smoke in Structure Fire

Abstract

Attenuation of electromagnetic waves in the fire scene is an important issue when the stability of wireless communication is concerned, especially in fire rescue scenarios of high-rise buildings. Therefore, it is of importance to study the effects of flame and smoke on the attenuation of electromagnetic waves in structure fire. In this article, the influence of flame was studied through using alcohol as fuel. Different types of fuels were used to produce different concentrations of smoke. Different ranges of electromagnetic wave frequency from 350 MHz to 400 MHz were also used to investigate the frequency-dependent properties of the attenuation effect. The results show that flame itself does not have significant effects on the electromagnetic wave attenuation, but smoke plays an important role. Smoke from diesel fuel results in larger signal attenuation than other fuels, with attenuation of 1.16 dB at 300 MHz. The relationship between the concentration of smoke and signal attenuation follows the first-order exponential function. It also indicates that electromagnetic wave attenuation is frequency-dependent. The attenuation is 5.43 dB at 360 MHz when the smoke concentration is 20 dB/m, but only 0.26 dB at 400 MHz. It is suggested that a frequency-dependent assessment should be considered for investigating the reliability of the wireless communication system in structure fire in high-rise buildings.

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Abbreviations

DD:

Displaying data (dBm)

MD:

Measured data (dBm)

PD:

Previous data (dBm)

Y:

Concentration tested by the ISDM (dimensionless)

c :

Particle number concentration of smoke (cm−3)

d :

Mean grain size of smoke particles (μm)

η :

Constant of ionization chamber (cm−2)

A :

Multiple parameter of the fitting curve (dimensionless)

t :

Exponent parameter of the fitting curve (dimensionless)

b:

Intercept parameter of the fitting curve (dimensionless)

x:

Attenuation parameter of the fitting curve (dB)

ε:

Smoke conversion factor of different materials

E :

Scattered far-field component in the scattering plane (V/m)

E :

Orthogonal component (V/m)

θ:

Scattering angle in the scattering plane (rad)

ϕ:

Angle between the scattering plane and the incident electric field (rad)

r:

Distance between the observation point and the scattering point (m)

k:

Wave number (m−1)

S1(cosθ):

Mie scattering amplitudes (V/m)

S2(cosθ):

Mie scattering amplitudes (V/m)

an :

Mie coefficients (dimensionless)

bn :

Mie coefficients (dimensionless)

πn :

Angular function of Mie scattering theory (dimensionless)

τn :

Angular function of Mie scattering theory (dimensionless)

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Acknowledgments

This research was supported by the National Science and Technology Support Project (12th Five-year Plan) (Nos. 2015BAK10B00, 2015BAK10B04) the Beijing Municipal Science and Technology Project (No. Z161100001016001) and the Open Foundation of Hefei Institute for Public Safety Research, Tsinghua University. We would like to thank Professor Zhang Yongming and other teachers and students from the State Key Laboratory of Fire Science in University of Science and Technology of China for their assistance. We would also thank the Collaborative Innovation Centre of Public Safety of Tsinghua University for their help.

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Correspondence to Hong-yong Yuan.

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Li, Yw., Yuan, Hy., Lu, Y. et al. Experimental Studies of Electromagnetic Wave Attenuation by Flame and Smoke in Structure Fire. Fire Technol 53, 5–27 (2017). https://doi.org/10.1007/s10694-016-0608-0

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Keywords

  • High-rise building
  • Fire rescue
  • Smoke
  • Signal attenuation
  • Wireless communication