Features of infrared thermal image and radiation

Wu, Lei; Jin-zhuang, Wang

doi:10.1007/bf02932435

Cited by 21 publications

(9 citation statements)

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“…Relationship between thermal field and strain field during the process of fault deformation is the physical basis for applying the satellite infrared information or land surface temperature to analyze earthquake or fault activity. The temperature variation on rock deformation during the process of loading is studied through a series of experiments [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] , which lays the foundation for further work, but these experimental results are not in accordance with one another, some of which are conflicted with the classical physical principle. For instance, some researchers suppose that relationship between temperature variation and stress state is related with rock category, which temperature rises in some rocks, keeps stable in some rocks, and drops in some rocks, under compression state.…”

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confidence: 99%

Theoretical and experimental study on relationship between stress-strain and temperature variation

Chen

Liu

et al. 2009

Sci. China Ser. D-Earth Sci.

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Principle on temperature response to the stress-strain variation is fundamental to the relationship between thermal radiation variation and stress-strain field. Current research indicates that temperature has a sensitive response to rock deformation under the condition of normal temperature background. However, the basic physical relationship between deformation and temperature variation is not clear and need to be investigated further. In this paper, principle on temperature response to stress-strain variation is studied in detail, based on thermodynamics, elastic strain theory, and experiments on both ideal material and rock. In the stage of elastic deformation, results indicate that: 1) temperature increment is positively correlated with volume strain variation. Temperature rises with hydrostatic pressure increase. In other words, temperature rises when the specimen is under the compressive state whereas temperature drops under the tensile state. 2) Pure shear deformation does not contribute to temperature variation. Namely, shape change of specimen does not produce temperature variation. However, there exist the relative tensile area and the compressive one in the specimen under the state of pure shear. Temperature drops within the relative tensile area while temperature rises within the compressive areas during the process of loading. stress-strain, temperature variation, volume strain, pure shear, sine-wave loadRecently, more and more thermal anomalies corresponding to earthquake and fault activity are investigated by using satellite remote sensing technology although many problems remain unsolved. Up to now, almost thermal infrared seismic precursors are found by rethinking of some phenomena, maybe related to seismic activity, after earthquake occurred. And it is lack of necessary analyses to physical mechanism on thermal infrared anomaly prior to earthquake, so that it does not judge the facticity and reliability of seismic precursor [1] . Relationship between thermal field and strain field during the process of fault deformation is the physical basis for applying the satellite infrared information or land surface temperature to analyze earthquake or fault activity. The temperature variation on rock deformation during the process of loading is studied through a series of experiments [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] , which lays the foundation for further work, but these experimental results are not in accordance with one another, some of which are conflicted with the classical physical principle. For instance, some researchers suppose that relationship between temperature variation and stress state is related with rock category, which temperature rises in some rocks, keeps stable in some rocks, and drops in some rocks, under compression state.There are two major reasons for the aforementioned discordant experimental results: 1) limitation of the experimental technology. The temperature variation during the deformation of rock is minimal. Therefore, the valid temperature signal...

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mentioning

confidence: 99%

Theoretical and experimental study on relationship between stress-strain and temperature variation

Chen

Liu

et al. 2009

Sci. China Ser. D-Earth Sci.

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“…5 in Fig. 3) experienced relatively high T LOW in 1987, 1990, 1995and 1998(see Figs. 1 and 2 in Ma et al (2006a), while no major earthquake took place in this region during this period.…”

Section: High Stress Level Is Not Indicator For Inevitable Occurrencementioning

confidence: 91%

“…Since the end of the 1980s, many researchers made effective efforts to study the relationship between thermal infrared information obtained via satellite and earthquakes, as can be seen in the representative work of B.J.Gopo9k j ep (1988), the following reports by Qiang et al (1990), and others (Xu et al, 1991;Cui et al, 1993;Geng et al, 1993;Morzova, 1996;Tronin, 1996;Deng et al, 1997;Morzova, 1997;Wu and Wang, 1998;Liu et al, 1999;Tronin, 1999;Morzova, 2000;Freund, 2002;Ouzounov and Freund, 2004).…”

Section: Study Significance Approach and Previous Workmentioning

confidence: 94%

Spatial-temporal variation of the land surface temperature field and present-day tectonic activity

Chen

Xiao-yan

et al. 2010

Geoscience Frontiers

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This study attempts to acquire information on tectonic activity in western China from land surface temperature (LST ) field data. On the basis of the established relationship between heat and strain, we analyzed the LST distribution in western China using the satellite data product MODIS/Terra. Our results show that: 1. There are departures from annual changes of LST in some areas, and that these changes are associated with the activity of some active tectonic zones. 2. When annual-change background values caused by climate factors are removed, the long-period component (LST LOW ) of temperature residual (DT ) of the LST is able to serve as an indicator for tectonic activity. We have found that a major earthquake can produce different effects on the LST fields of surrounding areas. These effects are characterized by both rises and drops in temperature. For example, there was a noteworthy temperature decline associated with the Sumatran M9 earthquake of 2004 in the Bayan Har-Songpan block of central Tibetan Plateau. 3. On the other hand, the LST field of a single area may respond differently to major shocks occurring in different areas in the regions surrounding China. For instance, the Kunlun M 8.1 event made the LST on the Longmen Mountains fault zone increase, whereas the Zaisan Lake M 7.9 quake of 2003, and the Sumatran M 9 event of 2004, caused decreases in the same area's LST. 4. The variations of land surface temperature (LST ) over time are different in different tectonic areas. These phenomena may provide clues for the study of tectonic deformation processes. On the basis of these phenomena, we use a combination of temperature data obtained at varied depths, regional seismicity and strain results obtained with GPS Geoscience Frontiers journal homepage: www.elsevier.com/locate/gsf Geoscience Frontiers (2010) 1, 57e67 measurements, to test the information related to tectonic activity derived from variations of the LST field, and discuss its implications to the creation of models of regional tectonic deformation. ª

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“…Thermomechanical coupling effects in engineering materials and structural components could become significant when mass inertia is not negligible, due to the flux of heat generated though the boundary of the body, or if the material is loaded beyond its stable reversible limit [29]. Experiment shows that coal and sandstone upon loading can exhibit three types of infrared thermal image and temperature features [30]. During deformation and failure process of rocks, thermography records temperature variations in the viewed surface and displays them as infrared image with false colors, where a high temperature (in warm color) denotes shear fracturing by the frictions; low temperature (in cool color) represents the tensile fracture indicating a permanent plastic damage [31].…”

Section: Physical Modeling and Infrared Detectionmentioning

confidence: 97%

“…Up to now, experimental works conducted at CUMTB involve the construction of the large-scale PFESA models imitating the geological strata at the inclination angles of 0, 15,30,45,60,90 degrees, respectively, the rock responses to the roadway tunnel excavation in these models, as well as the stability of the excavated roadways under high confining stresses similar to that of the deep mining. The physical modeling works on roadway tunnel in the geologically horizontal strata under excavation [22] and in operation [21] were reported previously.…”

Section: Introductionmentioning

confidence: 99%

Physical modeling of an underground roadway excavation in vertically stratified rock using infrared thermography

He¹,

Jia²,

Gong³

et al. 2010

International Journal of Rock Mechanics and Mining Sciences

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Features of infrared thermal image and radiation

Cited by 21 publications

References 0 publications

Theoretical and experimental study on relationship between stress-strain and temperature variation

Theoretical and experimental study on relationship between stress-strain and temperature variation

Spatial-temporal variation of the land surface temperature field and present-day tectonic activity

Physical modeling of an underground roadway excavation in vertically stratified rock using infrared thermography

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