Electromagnetic energy is emitted at different wavelengths, which are measured in microns = a millionth of a meter. Certain spectrums of EM emissions are visible to the naked eye, and just above the visible spectrum, are wavelengths that are slightly larger and that are referred to as the infrared spectrum. These wavelengths of electromagnetic energy are emitted by all objects and correspond to the amounts of heat given off by the object. Cameras can be set using filters so that they take pictures which are made from infrared rays alone, and they provide lots of information about objects being photographed. They also have many industrial and scientific uses.
Infrared photography is used for multifarious investigations of concrete and concrete structures. One of the earliest uses of infrared photography was for the investigation of house insulation. A house made of wood or concrete will emit different amounts of heat, in the winter, depending on the level of insulation.
A house with less insulation, or with areas of defective insulation will emit more heat, (infra-red radiations), and this can be seen as brightly colored areas of the infra-red photo, with shades of red and orange, compared to more heavily insulated areas, which appear in shades of blue.
In practice, most photographs known as “infra red photographs, are actually photographs which capture “near infrared rays,” these are rays of a wavelength between that of visible light and infrared light. The objects they photograph still resemble their physical appearance, only the photographs have an appearance of an ethereal, astral other worldly look. Pictures taken with pure infra red rays are often called thermal photography as they directly represent the amounts of heat emitted by the objects they capture.
An important application of infrared photography is in the search fro defects in concrete buildings, roads and other concrete structures. Areas which are defective, due to micro-buckling, or other defect, will have a different heat emission pattern than the surrounding concrete. The differential pattern can be picked up in photos taken at night when the concrete is giving off the heat absorbed during the day, or earlier in the day when the concrete is absorbing heat and reflecting heat at different rates. Modern infrared photos can pick up differentials in heat of as little as .1 degrees centigrade. With this amount of sensitivity, it is possible to pick up ducts, voids, and the presence of metal reinforcers in the concrete.
Infrared photography can also be used to inspect the success in application of grout to a concrete brick structure. This application of the photography works because concrete bricks have a hollow area in each brick. The hollow areas transmit heat at much different rates than the solid areas of the brick and this pattern is readily apparent on infrared photography of the structure. The areas where grout is applied should have a similar pattern to other solid parts of the brick, and this can be readily picked up on infrared photography.
Current belief that there is publicly available technology which can allow us to see through concrete structures is fantasy; however, such techniques are believed to exist in classified military and space technology circles. Cameras can be set using filters so that they take pictures which are made from infrared rays alone, and they provide lots of information about objects being photographed. They also have many industrial and scientific uses.
Infrared photography is used for multifarious investigations of concrete and concrete structures. One of the earliest uses of infrared photography was for the investigation of the insulation of a house. A house made of wood or concrete will emit different amounts of heat, in the winter, depending on the level of insulation.;
A house with less insulation, or with an area of defective insulation will emit a lot of heat, (infra-red radiations), from that area, and this can be seen as a brightly colored area of the infra-red photo, with shades of red and orange, compared to an insulated area which appears in shades of blue.
In practice, most photographs known as “infra red photographs, are actually photographs which capture “near infra red rays,” these are rays of a wavelength between that of visible light and infrared light. The objects they photograph still resemble their physical appearance, only the photographs have an appearance of ethereal or astral other worldly look. Pictures taken with pure infra red rays are often called thermal photography as they directly reflect the amounts of heat emitted by the objects they capture.
An important application of infrared photography is in the search fro defects in concrete buildings, roads and other concrete structures. Areas which are defective, due to micro-buckling, or other defect, will have a different heat emission pattern than the surrounding concrete. The differential pattern can be picked up in photos taken at night when the concrete is giving off the heat absorbed during the day, or earlier in the day when the concrete is absorbing heat and reflecting heat at different rates. Modern infrared photos can pick differentials in heat of as little as .1 degrees centigrade. With this amount of sensitivity, itr is possible to pick up ducts, voids, and the presence of metal reinforcers in the concrete.
Infrared photography can also be used to inspect the success in application of grout to a concrete brick structure. This application works because concrete bricks have a hollow area in each brick. The hollow areas transmit heat at much different rate than the solid areas of the brick and this pattern is readily apparent on infrared photography of the structure. The areas where grout is applied should have a similar pattern to other solid parts of the brick, and this can be readily picked up on infrared photography.
Current belief that there is publically available technology which can allow us to see through concrete structures is fantasy; however, such techniques are believed to exist in classified mililatary and space technology circles.
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