Absorption of Microwaves in Low Intensity Eucalyptus Litter Fire
Absorption of Microwaves in Low Intensity Eucalyptus Litter Fire
复制标题
低强度桉树垃圾火灾中微波的吸收
DOI：
10.4236/jemaa.2015.78023
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Kgakgamatso Marvel Mphale
中科院分区：
文献类型：
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作者：
Douglas Letsholathebe;Kgakgamatso Marvel Mphale
建立了一个燃料床，多种植被可作为燃烧燃料。燃料床配有热电偶测量火焰温度和双端口自动网络分析仪测量火焰介质中的微波散射参数。然后用这些参数来确定微波在火灾中的传播特性。这些测量结果对野火扑灭和遥感期间的无线电波通信具有重要意义。衰减数据还提供了植被火电离和电导率的估计。在燃料床上设置了最高火焰温度为976 K的桉树凋落物火，并在火焰中传播x波段微波（7.00 ~ 9.50 GHz）。对频率范围内的微波进行了0.35 ~ 0.90 dB的衰减测量。对于低强度火灾，电导率测量范围为0.00021 ~ 0.00055 mho/m，电子密度测量范围为1.83 ~ 2.24 × 1015 m-3。
A fuel bed was constructed where various vegetation species could be used as combustion fuel. The fuel bed was equipped with a thermocouple to measure fire temperature and a two-port automatic network analyser to measure microwave scattering parameters in flame medium. The parameters are then used to determine microwave propagation characteristics in fire. The measurements have implications on radio wave communication during wildfire suppression and in remote sensing. The attenuation data also provide an estimation of vegetation fire ionisation and conductivity. Eucalyptus litter fire with a maximum flame temperature of 976 K was set on the fuel bed and X-band microwaves (7.00 - 9.50 GHz) were caused to propagate through the flame. Attenuation of 0.35 - 0.90 dB was measured for microwaves in the frequency range. For the low intensity fire, conductivity was measured to range from 0.00021 - 0.00055 mho/m and electron density was to be the range of 1.83 - 2.24 × 1015 m-3.