Localization of lacustrine groundwater discharge (LGD) by airborne measurement of thermal infrared radiation

2013 ◽  
Vol 138 ◽  
pp. 119-125 ◽  
Author(s):  
Jörg Lewandowski ◽  
Karin Meinikmann ◽  
Thomas Ruhtz ◽  
Franziska Pöschke ◽  
Georgiy Kirillin
Keyword(s):  
Infrared Radiation ◽  
Groundwater Discharge ◽  
Thermal Infrared ◽  
Airborne Measurement ◽  
Thermal Infrared Radiation

scholarly journals Longwave indirect effect of mineral dusts on ice clouds

2010 ◽  
Vol 10 (16) ◽  
pp. 7753-7761 ◽  
Author(s):  
Q. Min ◽  
R. Li
Keyword(s):  
Infrared Radiation ◽  
Mineral Dust ◽  
Dust Cloud ◽  
Thermal Infrared ◽  
Minor Role ◽  
Ice Clouds ◽  
Cloud Systems ◽  
Ice Cloud ◽  
Mineral Dusts ◽  
Thermal Infrared Radiation

Abstract. In addition to microphysical changes in clouds, changes in nucleation processes of ice cloud due to aerosols would result in substantial changes in cloud top temperature as mildly supercooled clouds are glaciated through heterogenous nucleation processes. Measurements from multiple sensors on multiple observing platforms over the Atlantic Ocean show that the cloud effective temperature increases with mineral dust loading with a slope of +3.06 °C per unit aerosol optical depth. The macrophysical changes in ice cloud top distributions as a consequence of mineral dust-cloud interaction exert a strong cooling effect (up to 16 Wm−2) of thermal infrared radiation on cloud systems. Induced changes of ice particle size by mineral dusts influence cloud emissivity and play a minor role in modulating the outgoing longwave radiation for optically thin ice clouds. Such a strong cooling forcing of thermal infrared radiation would have significant impacts on cloud systems and subsequently on climate.

scholarly journals Variation Law of Infrared Radiation Temperature of Unloading Fracture of Composite Coal-Rock

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-20
Author(s):  
Xin Li ◽  
Xue Wang ◽  
Zhen Yang ◽  
Hao Li ◽  
Yan Li ◽  
...  
Keyword(s):  
Temperature Field ◽  
Infrared Radiation ◽  
Roof Rock ◽  
Confining Pressure ◽  
Thermal Infrared ◽  
Radiation Temperature ◽  
Floor Rock ◽  
Coal Rock ◽  
Loading And Unloading ◽  
Thermal Infrared Radiation

For composite mining coal-rock dynamic disaster, combining the theory of thermodynamics, damage mechanics, and other disciplines, the thermodynamic coupling mathematical model of composite coal-rock under an unloading condition is deduced, and the simulation model of composite coal-rock is established for numerical simulation. And the variation law of thermal infrared radiation under triaxial loading and unloading of composite coal-rock is analyzed and verified by experiments. The results show the following findings: (1) The distribution of thermal infrared radiation temperature of composite coal-rock is different in different stages of stress. The overall temperature of the temperature field is lower than the initial temperature field in the three-dimensional stress loading stage and the stage of stress-keeping pressure, but the internal temperature of the coal body is the highest. In the first stage of “loading and unloading,” the temperature of a coal seam increases slightly, and the temperature of other parts of the rock layer increases except for the circular low-temperature zone. In the second stage of “loading and unloading,” an alternating zone of high and low temperatures appears in the rock mass, and the temperature field is enhanced, among which the temperature field reaches the strongest after unloading the confining pressure. After jumping over the maximum stress, the temperature field decreases as a whole at the instability and rupture stage. (2) The variation of surface average thermal infrared radiation temperature ( T ave ) of composite coal-rock can be divided into the initial fluctuation stage, the linear heating stage, the local decline stage, the temperature sudden increase stage, and the fracture decline stage. At three different unloading rates of 0.003 MPa/s, 0.03 MPa/s, and 0.05 MPa/s, the T ave of coal body, floor rock, and roof rock reach the maximum before composite coal-rock instability and fracture, and the temperature change of the coal body is the most obvious. (3) Under different confining pressure unloading rates, the T ave of roof rock, coal body, and floor rock shows a strong linear relationship with stress after linear fitting. And the correlation between simulation and experimental results after fitting is above 0.89. The larger the confining pressure unloading rate is, the shorter the peak time of T ave arrives, and the larger the peak value. The comparison between the experimental results and the simulation analysis shows that the two results are consistent, and the research results can provide a theoretical basis for the prevention and control of dynamic disasters in coal and rock mining.

scholarly journals Thermal infrared characteristics of rock strata fracture in steeply inclined and extra thick coal seam

2020 ◽  
Vol 24 (6 Part B) ◽  
pp. 3933-3940
Author(s):  
Yan-Bin Yang ◽  
Feng Cui
Keyword(s):  
Coal Seam ◽  
Infrared Radiation ◽  
Thermal Infrared ◽  
Horizontal Section ◽  
Thick Coal Seam ◽  
Mining Depth ◽  
Movement Rules ◽  
The Relationship ◽  
Thermal Infrared Radiation ◽  
Rock Strata

In view of the complexity of the rules of rock strata fracture in steeply inclined and extra thick coal seam, the mining method of horizontal section top coal caving was put forward. In this paper, the physical similarity simulation model is established to analyze the movement rules of rock strata. The relationship between the form of rock strata fracture and the thermal infrared radiation is analyzed according to studying the characteristics of the thermal infrared radiation temperature of the rock strata fracture. Meanwhile, the changes characteristics of abnormal area of thermal infrared radiation were mastered, and the precursors of thermal infrared radiation of rock strata fracture were predicted. The results showed that the rock strata fracture form of steeply inclined and extra thick coal seam is related to the mining depth.

scholarly journals Improvements in the design of thermal-infrared radiation thermometers and sensors

2019 ◽  
Vol 27 (10) ◽  
pp. 14246 ◽  
Author(s):  
Howard W. Yoon ◽  
Vladimir Khromchenko ◽  
George P. Eppeldauer
Keyword(s):  
Infrared Radiation ◽  
Thermal Infrared ◽  
Thermal Infrared Radiation
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