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首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >Fire Detection by Microwave Radiometric Sensors: Modeling a Scenario in the Presence of Obstacles
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Fire Detection by Microwave Radiometric Sensors: Modeling a Scenario in the Presence of Obstacles

机译:微波辐射传感器进行火灾探测:在存在障碍物的情况下建模

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摘要

This paper deals with the problem of fire detection in the presence of obstacles that are nontransparent to visible or infrared wavelengths. Exploiting the obstacle penetration capability of microwaves, a solution based on passive microwave radiometry has been proposed. To investigate such a solution, a theoretical model of the scene sensed by a microwave radiometer is developed, accounting for the presence of both fire spot and wall-like obstacles. By reversing the model's equations, it is possible to directly relate the obstacle emissivity, reflectivity, and transmissivity to the antenna noise temperatures measured in several conditions. These temperatures have been sensed with a portable low-cost instrument. The selected 12.65-GHz operation frequency features good wall penetration capability to be balanced with a reasonable antenna size. In order to verify the aforementioned model, several fire experiments have been carried out, resulting in an overall good agreement between measurements and developed theory. In particular, a 2-cm-thick plasterboard wall, typically used for indoor building construction, shows a transmissivity equal to 0.86 and can easily be penetrated by a microwave radiometer in the X-band.
机译:本文讨论了在对可见光或红外波长不透明的障碍物的情况下进行火灾探测的问题。利用微波的障碍物穿透能力,提出了一种基于无源微波辐射测量的解决方案。为了研究这种解决方案,开发了一种微波辐射计感测到的场景的理论模型,该模型考虑了火斑和类似墙壁的障碍物的存在。通过逆转模型的方程式,可以将障碍物的发射率,反射率和透射率直接与几种条件下测得的天线噪声温度相关联。这些温度已通过便携式低成本仪器检测到。所选的12.65 GHz工作频率具有良好的穿墙能力,可以与合理的天线尺寸相平衡。为了验证上述模型,已经进行了几次火灾实验,从而在测量值和发展的理论之间取得了总体良好的一致性。特别是通常用于室内建筑的2厘米厚石膏板墙,其透射率等于0.86,并且可以很容易地被X波段的微波辐射计穿透。

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