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. 本发明提供了一种基于声场变化的三维火场信息探测与分析方法及系统，通过声波发射器向火场介质推送第一声波信号，再通过至少两个声波接收器分别接收至少两个第二声波信号，第二声波信号是第一声波信号在火场介质中传播后的声波信号；根据至少两个第二声波信号以及第一声波信号，得到每个第二声波信号对应的声强权重系数值，利用声传播介质的密度和温度变化对声波强度具有衰减作用，该衰减程度以声强权重系数值表示，其与对应区域内的火场温度变化呈正相关，通过声强权重系数值及其变化趋势，可以实时探测到火场的烟气密度以及温度的变化情况，从而可以实现长时间对室内火灾任意时段的三维火场信息的实时探测及诊断。