Peculiarities of amplitude spectra of the third order for the early detection of indoor fires

The object of this study is the
dynamics of hazardous parameters
of the gas environment during the
ignition of materials. The problem
that was solved is the early detection of fires in the premises. The
research results indicate the nonlinear nature of the dynamics of hazardous parameters of the gas environment in the absence and presence
of materials ignition. It was established that the bispectrum amplitude,
in contrast to the amplitude spectrum of the hazardous parameters
of the gas medium, contains information on the reliable detection of
fires. As such information, the value
of the positive dynamic amplitude
range of bispectrum is used. It was
established that during the ignition
of alcohol, the positive dynamics of
the amplitude bispectrum of all dangerous parameters of the gas medium change. Significant changes are
characteristic of smoke density (from
1 dB to 30 dB) and temperature (from
1 dB to 70 dB). The dynamic range
of amplitude bispectrum for CO concentration is increased from 30 dB
to 70 dB. Paper ignition was found
to reduce the dynamic range of the
amplitude bispectrum for smoke density from 40 dB to 20 dB. At the same
time, the dynamic range of amplitude
bispectrum for carbon monoxide concentration and temperature increases
to 60 dB. The ignition of wood causes an increase in the dynamic range
of the amplitude bispectrum relative
to the concentration of carbon monoxide from 40 dB to 60 dB, and the
temperature – from 30 dB to 40 dB. It
was established that when textiles are
ignited, the range of dynamics of the
amplitude bispectrum for temperature increases from 10 dB to 60 dB.
The results indicate that the dynamic characteristics of the amplitudes
of the bispectrum of the gas medium
can be used in practice for the early
detection of fires in the premises