Optimization of scattering angle for fire smoke detectors based on asymmetry ratio

doi:10.16265/j.cnki.issn1003-3033.2022.04.016

Abstract

Abstract:

In order to improve performance of smoke detectors based on asymmetric ratio, scattering angle was optimized, and a light scattering physical model was established based on collected particle size information of fire smoke. Then, angular distribution of scattered light intensity was calculated with a certain particle size distribution by using DDA method, and influence of particle morphology and size parameter on scattering characteristics was discussed. The results show that scattered light intensity decreases first and then rises as observation angle increases, and the angle corresponding to the minimum intensity value changes withe size parameter. The key to optimize scattering angle design of smoke detectors based on asymmetry ratio lies in the selection of back-scattering angle which should be 110° when size parameter is small and 135° when the parameter is large.

Key words: asymmetric ratio, smoke detector, scattering angle, discrete dipole approximation (DDA), smoke particle

SHI Zhicheng, ZHOU Yong, CHENG Xudong. Optimization of scattering angle for fire smoke detectors based on asymmetry ratio[J]. China Safety Science Journal, 2022, 32(4): 107-112.

Figures/Tables 9

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