Physics of Thermal Radiation

DeWitt, D P.; Incropera, F. P.

doi:10.1002/9780470172575.ch1

Cited by 37 publications

(64 citation statements)

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“…The multi-parametric monitoring system has been implemented with seasonal remote surveying via InfraRed Thermography (IRT) in order to evaluate the role of both solar radiation and rock-block exposure on surficial rock temperature. IR-imaging represents a reliable, rapid and non-destructive technique that allows to derive temperature distribution at the rock-air interface, quantifying the effect of solar radiation on heat propagation over a discontinuous medium [ 57 , 58 ].…”

Section: Irt-survey: Principles and Methodsmentioning

confidence: 99%

Thermal Response of Jointed Rock Masses Inferred from Infrared Thermographic Surveying (Acuto Test-Site, Italy)

Fiorucci

Marmoni

Martino

2018

Sensors

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The Mediterranean region is affected by considerable daily and seasonal temperature variations due to intense solar radiation. In mid-seasons, thermal excursions can exceed tens of degrees thus influencing the long-term behaviour of jointed rock masses acting as a preparatory factor for rock slope instabilities. In order to evaluate the thermal response of a densely jointed rock-block, monitoring has been in operation since 2016 by direct and remote sensing techniques in an abandoned quarry in Acuto (central Italy). Monthly InfraRed Thermographic (IRT) surveys were carried out on its exposed faces and along sections of interest across monitored main joints. The results highlight the daily and seasonal cyclical behaviour, constraining amplitudes and rates of heating and cooling phases. The temperature time-series revealed the effect of sun radiation and exposure on thermal response of the rock-block, which mainly depends on the seasonal conditions. The influence of opened joints in the heat propagation is revealed by the differential heating experienced across it, which was verified under 1D and 2D analysis. IRT has proved to be a valid monitoring technique in supporting traditional approaches, for the definition of the surficial temperature distribution on rock masses or stone building materials.

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Section: Irt-survey: Principles and Methodsmentioning

confidence: 99%

Thermal Response of Jointed Rock Masses Inferred from Infrared Thermographic Surveying (Acuto Test-Site, Italy)

Fiorucci

Marmoni

Martino

2018

Sensors

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“…All matters with a temperature above 0 K emit radiation [26]. In the infrared wavelength spectrum, mid-wave infrared (MWIR: 2.5–7 μ m) and long-wave infrared (LWIR: 7–14 μ m) are the most interesting wavelengths for imaging [27].…”

Section: Methodsmentioning

confidence: 99%

“…Infrared thermography is based on the measurement of the radiation mode of heat transfer of a body in the infrared spectrum, which is a function of the temperature of the body [ 25 ]. All matters with a temperature above 0 K emit radiation [ 26 ]. In the infrared wavelength spectrum, mid-wave infrared (MWIR: 2.5–7 μ m) and long-wave infrared (LWIR: 7–14 μ m) are the most interesting wavelengths for imaging [ 27 ].…”

Section: Methodsmentioning

confidence: 99%

Automatic Detection of Animals in Mowing Operations Using Thermal Cameras

Steen

Villa‐Henriksen

Therkildsen

et al. 2012

Sensors

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During the last decades, high-efficiency farming equipment has been developed in the agricultural sector. This has also included efficiency improvement of moving techniques, which include increased working speeds and widths. Therefore, the risk of wild animals being accidentally injured or killed during routine farming operations has increased dramatically over the years. In particular, the nests of ground nesting bird species like grey partridge (Perdix perdix) or pheasant (Phasianus colchicus) are vulnerable to farming operations in their breeding habitat, whereas in mammals, the natural instinct of e.g., leverets of brown hare (Lepus europaeus) and fawns of roe deer (Capreolus capreolus) to lay low and still in the vegetation to avoid predators increase their risk of being killed or injured in farming operations. Various methods and approaches have been used to reduce wildlife mortality resulting from farming operations. However, since wildlife-friendly farming often results in lower efficiency, attempts have been made to develop automatic systems capable of detecting wild animals in the crop. Here we assessed the suitability of thermal imaging in combination with digital image processing to automatically detect a chicken (Gallus domesticus) and a rabbit (Oryctolagus cuniculus) in a grassland habitat. Throughout the different test scenarios, our study animals were detected with a high precision, although the most dense grass cover reduced the detection rate. We conclude that thermal imaging and digital imaging processing may be an important tool for the improvement of wildlife-friendly farming practices in the future.

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“…The tructure, surface characteristics and temperature of object can determine its infrared radiant quantity, and the efficiency of distributing infrared energy is called emissivity. If two objects have the same temperature, but their emissivities are different, the one with higher emissivity seems "hotter" than the other one observed by infrared thermal imagery system [36].…”

Section: Infrared Detection Methodsmentioning

confidence: 99%

Development of vibration style ladle slag detection methods and the key technologies

Tan

et al. 2010

Sci. China Technol. Sci.

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Ladle slag carry-over detection technology (SCDT) is of important practical significance to steel continuous casting production (CCP), which can effectively improve the casting blank quality, increase molten steel yield ratio, and protract the service life of tundish. The current SCDT realization methods and their application circumstance were summarized, and their main problems during the course of factual production were pointed out. The difficult technical points of detection principle, digital signal processing for vibration style SCDT development were described. To aim at the problems of vibration style SCDT, such as low recognition stability and long applied adjustment time, its key technologies including water model experimental platform establishment, two-phase sink vortex entrapment mechanism, forced vibration response of shroud nozzle and steel stream shock vibration signal processing optimization were analyzed deeply, and the corresponding research route and advices were given. ladle slag carry-over, sink vortex, slag entrapment, shock vibration Citation: Tan D P, Ji S M, Li P Y, et al. Development of vibration style ladle slag detection methods and the key technologies.

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Physics of Thermal Radiation

Cited by 37 publications

References 0 publications

Thermal Response of Jointed Rock Masses Inferred from Infrared Thermographic Surveying (Acuto Test-Site, Italy)

Thermal Response of Jointed Rock Masses Inferred from Infrared Thermographic Surveying (Acuto Test-Site, Italy)

Automatic Detection of Animals in Mowing Operations Using Thermal Cameras

Development of vibration style ladle slag detection methods and the key technologies

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