文档介绍：双波长法区分火灾烟颗粒与干扰颗粒 Dual-wavelength Way to Differentiate Fire Smoke Particles and Interfering Particles 作者姓名孙悟学位类型学历硕士学科专业光学工程研究方向激光原理与应用导师及职称邓小玖教授 2013年4月双波长法区分火灾烟颗粒与干扰颗粒摘要传统的光电感烟探测器,通过单纯地检测烟颗粒的散射光,实现报警。然而,由于部分大气悬浮颗粒也可以引起光电感烟探测器发生类似的光散射作用,继而引发误报,这些引发光电感烟探测器误报的颗粒被称为干扰颗粒。干扰颗粒的主要部分是液滴悬浮颗粒与粉尘悬浮颗粒,正确地区别火灾烟颗粒、液滴颗粒与粉尘颗粒,对于避免误报,提高光电感烟探测器的准确度有重要意义。火灾烟颗粒、液滴颗粒与粉尘颗粒在颗粒形貌与粒径大小方面存在着较大差别。液滴颗粒表现为明是近似球体的颗粒,而火灾烟颗粒与粉尘颗粒表现出明显的非球型性;粉尘颗粒的粒径大于火灾烟颗粒与液滴颗粒的粒径。火灾烟颗粒、液滴颗粒与粉尘颗粒的以上差别将导致颗粒的光散射特性的差异。为了定量的来描述火灾烟颗粒、液滴颗粒与粉尘颗粒光散射特性的差别,这里引入了光散射矩阵。光散射矩阵是一个四行四列的矩阵,能全面的描述颗粒的散射特性。文章中使用T矩阵法,选择双波长入射光,进行数值计算,得到了两种波长条件下的火灾烟颗粒、液滴颗粒与粉尘颗粒的光散射矩阵。对经过加权平均与归一化处理后的计算结果进行分析,发现归一化光散射矩阵的差异一定程度上反映了火灾烟颗粒、液滴颗粒与粉尘颗粒的形貌与粒径区别。在归一化的光散射矩阵元素中选择了其中最合适的一组元素,把火灾烟颗粒、液滴颗粒与粉尘颗粒的差别转变为了数值的差别,并且经过处理后,把两种波长入射光照射下的颗粒归一化散射矩阵元素转变为逻辑真值,通过异或逻辑运算区分了火灾烟颗粒、液滴颗粒与粉尘颗粒,减少了干扰颗粒引起的误报,提高了光电感烟探测器的精度。关键字:光散射矩阵双波长异或 Dual-wavelength Way to Differentiate Fire Smoke Particles and Interfering Particles ABSTRACT Traditional photoelectric smoke detectorsalarm simply by detecting light intensity scattered by smoke particles. However, because some atmosphere can also cause photoelectric smoke detector light scattering effect like smoke particles, that will lead to false particles which cause false alarm are called interfering particles. The main part of interfering particles is drip particles and dust particles, so it is important for reducing false alarm to differentiate fire smoke, drips and dust correctly. There are some differences in shapes and particle diameter amongfire smoke, drips and dust: drips are spheres while smoke and dust are non-sphere, dust’s diameter is much larger than smoke and drips. These differences will causes differences in light scattering characteristics and the light scattering matrix which isable to describe particles’ light scattering characteristics will also be different. It calculates light scattering matrix of smoke, dust and dips by T