辐射背景对岩石受力热红外光谱变化影响的实验研究

研究表明，岩石在加载过程中表面的红外辐射随应力发展而变化，而辐射信息的有效提取与辐射背景存在密切关系。通过理论分析不同实验环境对岩石受力热红外光谱变化影响，开展了花岗岩在室内外环境下的受力热红外光谱观测实验，分析了不同辐射背景下岩石红外辐射与应力的相关性以及由应力引发的辐射变化信息的强弱差异，并对两种环境下岩石应力热红外探测的优势波段进行了对比分析。结果表明，辐射背景对岩石受力热红外光谱探测结果有重要影响，室外环境因背景辐射较弱，相同应力作用下的红外辐射变化更加显著，与应力之间的相关程度更高，优势波段区间更宽，更加有利于岩石应力的热红外探测。8.0~11.8 μm波段是利用热红外遥感监测地表花岗岩应力变化的优势波段。

Experimental Study on the Influence of the Radiation Background on the Variation in Thermal Infrared Radiance of Loaded Rock

Previous studies have shown that the thermal infrared radiation of rock surface changes corresponding to the stress in the rock loading process. The effective extraction of radiation variation information depends on the influence from background radiation. Thus, this study aims to analyze the variety of thermal infrared spectrum for loaded rock under different experimental conditions. The thermal infrared radiation experiments of loaded granite were carried out in both indoor and outdoor conditions. The relationship between radiation variation and stress under different experimental condition was investigated, and the characteristic of radiation information caused by stress was analyzed. Furthermore, we compared the sensitive waveband to stress in thermal infrared detection under indoor and outdoor conditions. The results showed that the radiation background had a significant effect on the radiation changes of loaded rock. It was found that the infrared radiation changed more significantly, and correlated more closely to stress in the outdoor condition, while the sensitive waveband is wider due to the relatively weak background radiation. It is more accurately and reasonably for detecting the thermal infrared radiation of loading rock in the outdoor condition. The 8.0～11.8 μm wave range can be considered as the effective waveband for granite stress monitoring using thermal infrared remote sensing technology.