Three-dimensional fire scene information detection and analysis method and system based on sound field change

Abstract

The invention provides a three-dimensional fire scene information detection and analysis method and system based on sound field change. The method comprises the steps that a first sound wave signal ispushed to a fire scene medium through a sound wave transmitter, and at least two second sound wave signals are respectively received through at least two sound wave receivers, wherein the second sound wave signal is a sound wave signal after the first sound wave signal is propagated in the fire scene medium; according to the at least two second sound wave signals and the first sound wave signal,a sound intensity weight coefficient value corresponding to each second sound wave signal is obtained, the density and the temperature change of the sound propagation medium have an attenuation effecton the sound wave intensity, the attenuation degree is expressed by the sound intensity weight coefficient values and is in positive correlation with the temperature change of the fire scene in the corresponding area; through the sound intensity weight coefficient value and the change trend of the sound intensity weight coefficient value, the smoke density of a fire scene and the change conditionof the temperature can be detected in real time, and therefore long-time real-time detection and diagnosis of three-dimensional fire scene information of an indoor fire disaster at any time period can be achieved.

Description

Technical field[0001]The invention relates to the field of fire safety systems, in particular to a method and system for detecting and analyzing three-dimensional fire field information based on sound field changes.Background technique[0002]Acoustic wave is a kind of spatial longitudinal wave, which is the propagation of vibration caused by sound source in adjacent space medium. The area covered by sound waves is called the sound field. Under normal circumstances, the main medium of sound transmission is air, and the hot smoke in the fire field can also become the sound transmission medium. The density and temperature changes of the sound propagation medium will attenuate the sound wave intensity. Due to the high temperature environment of indoor fires, temperature changes will cause gas density changes, so the gas environment (air and smoke) in the fire site has very obvious changes in density.[0003]When a fire breaks out in a building, due to restricted ventilation conditions, hig...

AI Technical Summary

Problems solved by technology

When the scale of the fire develops from the initial growth to the middle and late stage, due to the occlusion of hot smoke and the influence of high radiation flux, conventional fire monitoring and detection equipment such as cameras and detectors are difficult to operate normally, and cannot effectively transmit fire information

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