Experimental Study on Particle Size Distribution Characteristics of Aerosol for Fire Detection

Abstract

Current optical fire smoke detectors use scattering light intensity as an indicator of smoke concentration and trigger fire alarms when the intensity exceeds a threshold value. However, such detectors are prone to false alarms caused by non-fire aerosols since both fire smokes and non-fire aerosols scatter light. Thus, in order to reduce false alarms caused by non-fire aerosols such as dust and water vapor, fire detectors must be capable of distinguishing fire smoke from non-fire aerosols. Since the light scattering signals depend on the particle size information of aerosols, it is essential to study and characterize the particle size distribution of fire smoke and non-fire aerosols for differentiating them. In this paper, a comprehensive aerosol experimental platform is built to measure the particle size distribution of various typical fire smokes and non-fire aerosols. Through the conducted experiments, we note that there are significant differences in the particle size distributions of typical fire smokes and non-fire aerosols, with a boundary of about 1μm. The experimental results provide fundamental data support of the particle size distribution for developing a better fire detector that accurately identifies smoke.

Measurement of the Size Distribution of Smoke Particles through Direct Sampling at the Exit of a Steady-State Tube Furnace

“…화재 현장에서 발생하는 연기에 대한 각 화재 조건에서의 입 자 발생 특성은 연기로 인한 거주자 및 소방관의 장단기 인체 피해의 주요 원인인 폐 침전뿐만 아니라 연기에 의한 화재 감지 등과 관련하여 소방 분야에서 중요한 연구 주제이다 (1)(2)(3)(4) . 연 기와 관련된 미세먼지의 유해성과 관련하여 최근에는 미세먼지의 , 양뿐만 아니라 크기가 인체에 중요한 영향을 미친다는 사실이 알려지면서 초미세먼지에 대한 관심이 높아지고 있다 (1,2,5) .…”