AVERAGE PHASE OF THE BISPERCLE OF THE CONCENTRATION OF CARBON OXIDE IN THE GAS ENVIRONMENT OF ROOMS AT THE INTERVALS OF THE ABSENCE AND APPEARANCE OF THE IGNITION OF MATERIALS

Abstract

The object of the study is the dynamics of carbon monoxide concentration in the
gaseous environment during fires of materials in premises. The importance of such a study
is related to the possibility of using the measure of the average phase of the coherent
bispectrum of the dynamics of carbon monoxide concentration for detecting fires and
preventing emergencies as a result of fires. The measure of the average phase of the
coherent bispectrum of the dynamics of carbon monoxide concentration in the gaseous
environment at an arbitrary time interval of observation is substantiated. The features of the
measure of the average phase of the coherent bispectrum of the dynamics of carbon
monoxide concentration in the gaseous environment in the chamber at intervals of reliable
absence and presence of ignition of alcohol, paper, wood and textiles are experimentally
investigated. The results obtained indicate that the dynamics of the concentration of carbon
monoxide in the gaseous environment in the chamber at intervals of absence and presence
of ignition of test materials as a whole belong to the class of non-reversible processes that
have obvious asymmetry. It was found that the average phase measure of the coherent
bispectrum of the dynamics of the carbon monoxide concentration of the gas environment in
the presence and absence of fires has different values for the considered test materials. In
addition, the average phase measure of the coherent bispectrum of the dynamics of the
carbon monoxide concentration of the gas environment in the absence of fires is negative,
and in the presence of fires – positive. It was obtained that the average phase of the
coherent bispectrum of the dynamics of the carbon monoxide concentration of the gas
environment of the chamber at the intervals of the absence of ignition of alcohol, paper,
wood and textiles has the values of -1.509, -1.108, -0.655 and -1.37 rad, respectively. At the
same time, at the intervals of the occurrence of ignition of alcohol, paper, wood and
textiles, the average phase of the coherent bispectrum of the dynamics of the carbon
monoxide concentration is +1.501, +1.645, +1.553 and +0.309 rad, respectively. Thus, the
proposed measure of the average phase of the coherent bispectrum of the dynamics of
carbon monoxide concentration in the gas environment allows it to be used for early
detection of fires in premises, which prevents the occurrence of emergency situations due to
fires at facilities.