摘要
利用热红外成像技术进行岩石低速法向撞击瞬间的遥感监测试验研究,通过对获取的目标区域热红外信息(热辐射特征及热像几何特征)的提取与反演,可以得出:(1)岩石靶元在法向撞击时存在一临界速度,在该临界速度下,撞击因子与辐射特征及几何特征均相关,即弹体速度与红外温度变化量二次相关,与周长特征线性相关;弹体动能与红外辐射通量及面积特征均线性相关;(2)辐射通量特征与弹体动能之间的线性关系以及周长特征与弹体速度的线性关系可作为岩石低速撞击反演的基本途径;而红外辐射温度特征与弹体速度的二次关系以及面积特征与弹体动能的线性关系可作为岩石低速撞击反演的辅助途径。
With the thermal infrared（TIR） imaging technology, the non-contact transient process of marble rock normally impacted by a steel projectile was detected. Based on the information extraction of thermal infrared characteristics（i, e., radiant characteristics and geometric features） from the target thermography （that just reflects part of IR radiation on the impact region, the relationships between impact-related parameters and IR-related quantities are regressively analyzed. Finally, in an additional trial, some impact-related parameters are back analyzed, such as the projectile＇s impacting velocity and kinetic energy. It was discovered that： （1） there exists a critical velocity for rock target thermography to be regular and centrally symmetrical. Within the critical velocity, the velocity of the projectile is linearly correlated to the perimeter and is quadratically correlated to the increment of TIR temperature of the target thermography; while the kinetic energy of the projectile is linearly correlated to both the area and the increment of the TIR radiant flux within the target thermography; and （2） for the quantitative back analysis to the impact-related parameters, both geometric features and radiant characteristics can be applied. It was suggested that the perimeter and the increment of the TIR radiant flux of the target thermography can be taken as the most efficient indices with the relative error of back analysis being less than 5%, while the area and the increment of TIR temperature can be taken as other auxiliary indices with error less than 15%. The results are of general meaning to the impact of other rock and solid materials; and it might extend the application of infrared remote sensing technology from static geosciences domain to dynamic mechanical domain.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2006年第1期61-66,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(10172090)
中国科学院武汉岩土力学研究所前沿领域基础研究基金资助项目(Q110307)
香港研究资助局资助项目(3_ZB40)
关键词
岩石力学
热红外
低速撞击
特征提取
反演分析
rock mechanics
thermal infrared（TIR）
low-velocity impact
feature extraction
back analysis
