Dual-Wavelength photodetection with amorphous gallium oxide for simulated fire smoke discrimination

doi:10.16265/j.cnki.issn1003-3033.2026.05.0033

Abstract

Abstract:

A dual-wavelength photoelectric smoke detection simulation system based on amorphous gallium oxide broadband photodetectors was proposed to resolve the limitations of traditional light-scattering smoke detectors. These traditional detectors were susceptible to interference from dust and moisture, exhibit high false alarm rates, and feature prolonged response times. Based on Mie scattering theory, dual wavelengths (980 and 405 nm) were employed by the system to measure smoke particle volume surface area concentration. And SMD was derived for effective differentiation between fire-related and non-fire-related smoke. Measurement bias was minimized by optimization of detection angle parameters (980 nm: 60°, 405 nm: 120°) through theoretical analysis and simulation experiments. The system's effectiveness was validated by simulation tests. Results indicate that the system maintains low false alarm rates for test smoke (fire tests ≤3.3%, non-fire smoke ≤6.7%), demonstrating high sensitivity and low false alarm rates.

Key words: amorphous gallium oxide, dual-wavelength, photodetector, fire smoke, sauter mean diameter (SMD)

CLC Number:

X928.7火灾与爆炸事故

Yu Junling, Deng Hao, Ren Xianpei, Xiang Hui, Li Qiang, Hu Qiwei. Dual-Wavelength photodetection with amorphous gallium oxide for simulated fire smoke discrimination[J]. China Safety Science Journal, 2026, 36(5): 182-189.

Figures/Tables 12

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Table 1

References 14

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技术方案	原理	优势	不足
本文双波长光学模型	双波长散射光强比推粒子粒径	成本较低、抗干扰提升、易于集成	精度低于直接粒子分析
复合探测器	烟雾、温度或CO等多物理融合判断	判别逻辑全面,对典型火灾综合误报率低	硬件成本较高;对仅冒烟而无明显温升或CO的早期火情响应可能滞后
烟雾分析仪	激光粒子计数分析	灵敏度极高,可极早期预警,提供精确粒径分布数据	系统昂贵,安装复杂(需布设采样管网),维护要求高
视觉图像烟雾探测	计算视觉分析烟雾图像特征	可视复核、大范围监视、火源定位	受环境光照、遮挡、雾气影响大;隐私顾虑;算法易受动态光影干扰