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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing. >The Variation in Microwave Brightness Temperature of Granite Pressed Under Weak Background Radiation
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The Variation in Microwave Brightness Temperature of Granite Pressed Under Weak Background Radiation

机译：弱背景辐射下花岗岩微波亮度温度的变化

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Generally, ground stress accumulates in the process of earthquake (EQ) preparation. The change trend of microwave brightness temperature ( $T_{B}$ ) of rock with stress change is an important factor for the understanding of the microwave anomalies associated with EQs. However, it is not yet clear whether the downtrend of rocks’ $T_{B}$ is associated with increased stress. To confirm this, in this article, the instantaneous field of view of the microwave radiometer was identified first. Then, the microwave observation experiments were conducted on granite samples at 6.6 GHz under cyclic loading and outdoor conditions with weak background radiation. It was found that besides uptrend and fluctuation, the downtrend of granite samples’ $T_{B}$ also correlates with stress, with an occurrence probability of 47.62% and a maximum rate of −0.038 K/MPa. The variation trends of $T_{B}$ with stress are not uniform across different areas of the same sample. To reveal the cause of this phenomenon, the permittivity of single-crystal quartz, one of the main mineral compositions of granite, was measured when it was under compassion loading at the direction perpendicular or parallel to the optical axis. For quartz, the real part of the permittivity rises (falls) when the two directions are perpendicular (parallel), causing the $T_{B}$ to fall (rise). The optic axes of minerals are randomly distributed in granite samples, which make the variation in the permittivity of minerals also random, thereby resulting in the nonuniformity of stress-induced $T_{B}$ variation in granite samples. Finally, the implications of these results were discussed.
机译：通常，地应力积聚在地震（EQ）制备过程中。微波亮度温度的变化趋势（ $ T_ {B} $ ROCK的岩石与压力变化是了解与之相关的微波异常的重要因素eqs。但是，尚不清楚岩石的下降趋势是否'<内联公式XMLNS：mml =“http://www.w3.org/1998/math/mathml”xmlns：xlink =“http：//www.w3 .org / 1999 / xlink“> $ T_ {B} $ 与压力增加相关。为了确认这一点，在本文中，首先确定微波辐射计的瞬时视野。然后，在循环载荷和室外条件下，在6.6GHz的花岗岩样品上进行微波观察实验，伴随着背景辐射弱。有发现除上升和波动之外，花岗岩样本的下降趋势'<内联公式XMLNS：mml =“http://www.w3.org/1998/math/mathml”xmlns：xlink =“http：//www .w3.org / 1999 / xlink“> $ t_ {b} $ 也与压力相关，发生概率为47.62％最大速率为-0.038 k / mpa。 < Tex-Math符号=“乳胶”> $ t_ {b} $ 带有压力在同一样本的不同区域不均匀。为了揭示这种现象的原因，当在垂直或平行于光轴的方向上在同情加载时，测量单晶石英的介电常数，其中花岗岩的主要矿物组合物。对于石英，当两个方向垂直（并行）时，介电常数的实际部分升起（跌落），导致<内联公式XMLNS：MML =“http://www.w3.org/1998/math/mathml” XMLNS：XLink =“http://www.w3.org/1999/xlink”> $ t_ {b} $ fall （上升）。矿物的光学轴在花岗岩样品中随机分布，这使得矿物质介电常数的变化也随机，从而导致应力诱导的 $ t_ {b} $ 花岗岩样品的变化。最后，讨论了这些结果的影响。

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