Abstract - Aerial Infrared Thermography. g Thermal Mapping as an Asset Management Tool. for Universities, Large Campuses, Buildings

Transcription

1 Abstract - Aerial Infrared Thermography g Thermal Mapping as an Asset Management Tool for Universities, Large Campuses, Buildings Questions, Comments or Suggestions to: Matthew Reuter (267) airs@comcast.net

2 This is a mosaic infrared (IR) image a ~ 1000-acre campus erial Infrared Imagery gery is imagery that shows heat. It is often in the form of a grayscale picture whose shades of gray indicate the differences vity of objects in the image. Typically, objects in the image that look lighter are warmer and those that look darker are ts are the warmest in the images. Black objects are the coolest. Any object with a temperature above absolute zero ( 0 elsius) emits infrared radiation. An infrared picture only shows objects which emit infrared wavelengths in the in visible light wavelengths of 400 to 700 nanometers are detected, but only because they also emit heat. An example of et light that can be seen in the IR imagery. The image may be modified in a number of ways to enhance its value to the end lse-color image or adjusting the brightness and contrast of a grayscale image. The digital images are captured directly to n a CD-ROM.

3 erial IR imaging using fixed-wing aircraft rts with high-angle, straight down infrared images, which reflections and capture large areas at once, making the imagery nd the report less expensive to produce. aptured straight-down or plan view, the report is clear, concise and easy to understand because infrared images, visual AD drawings are reconciled. Used are high-resolution infrared imagers and digital recording equipment. Typical installations of infrared imaging and digital data systems

4 erial Infrared Steam System, Hot Water and Chilled Water Line Imagery are almost always readily visible with infrared imaging, even when no notable problems exist. This is due to the fact that no ation, there is always heat loss from the lines which makes its way to the surface. Problem areas are generally quite evident, ignatures that exceed the norm. Steam line faults normally appear as an overheated line or as a large hotspot in the form of he line. Overheated lines often occur when the steam line is located in a conduit or tunnel. If there is a leak in the line it will with escaping steam. If a steam line is buried directly in the ground with an insulating jacket, a leak will usually saturate t largely ineffective and will begin to transfer heat into the ground around the leak, producing the classic bulge or balloonline. Finally, some leaks may show up as an overheated manhole or vault cover. Manholes or vaults that contain steam hich are leaking will often heat the covers to warmer than normal temperatures. a little misleading, unless one understands and interprets the relative brightness and temperature of a given line correctly. me temperature from one end to the other that passes under different surfaces and materials can exhibit a variety of r example, five different apparent temperatures will result from the same temperature line that runs under a grass-covered t, a concrete loading dock, a gravel-covered area and bare earth pathway. er (HTHW), medium temperature hot water (MTHW) and low temperature hot water (LTHW) lines benefit similarly to densate return systems, with an associated degree of difficulty in surveying because of the declining temperature difference water supply (CHWS) and Chilled water return (CHWR) lines are usually cooler than the surface temperature and can be and leaks as well.

5 Example of mosaic thermal and visible image (red area box shown on next slide)

6 Example of mosaic thermal and visible image (steam line leaks)

7 Steam and condensate return lines heat the ground above the line (insulation failures)

8 Steam and condensate return lines heat the ground above the line (steam line leak)

9 Steam line leak and heated water leaking upward, to the ground surface

10 Buried chilled water line cools the surface above the line

11 erial Infrared Roof Imagery ntamination often manifest themselves as warmer (lighter colored) areas that may be nebulous in shape and sometimes hough they are commonly found in linear or puddle-like shapes. The linear shapes many times follow low areas, drainage ms. Puddle-like round or oblong shapes often form around roof penetrations such as mechanical equipment, standpipes, areas are lighter in color because the latent heat (from daylight sunshine) in the trapped water mass is greater than in the or roof substrate. After sunset when the roof structure cools down, wet areas of roof insulation and other materials llowing our sensitive infrared cameras to detect the sources of heat and record them for later analysis. oisture surveys while standing on the roof is not the best method because imagery from a walk-on survey is not as useful e laws of physics apply to both aerial IR and on-roof IR. A dry roof, low winds and no rain are needed on the night of the dow" when the roof is radiating heat differently from wet and dry areas is longer with aerial infrared because slight ver large areas are recognizable. A high angle of view and high resolution are needed to produce usable imagery.

12 Example of mosaic thermal and visible image (red area box shown on next slide)

13 Example of entrained roof moisture in roofs

14 Example of 4 GRE thermal image of a roof

15 Example of thermal image, visible image and CAD drawing

16 Photograph

17 Thermograph

18 CAD Drawing

19 Example of mosaic visible image of a low-sloped roof

20 Example of mosaic thermal image of a low-sloped roof

21 Example of CAD drawing of a low-sloped roof

22 Example of mosaic visible image of a low-sloped roof with CAD drawing overlay

23 Example of mosaic thermal image of a low-sloped roof with CAD drawing overlay

24 erial Infrared Imagery of Waterways Systems lines, storm water drain discharges and illegal taps into storm water drainage lines can often be identified by their thermal certain times of the year. As these sources of pollution leak, seep or empty into creeks, streams, rivers and lakes, their om their surroundings and they can be pinpointed accurately from the air. Cool temperatures (lower than 40 degrees F) and hours) conditions are required. As a general rule, the lower the ground surface and the water surface temperatures, the more way will exhibit near homogenous temperature patterns except for areas where another liquid has joined the flow. This flow warm as compared to the surface water in a creek, stream, river or lake - particularly during cooler times of the year, due he ground a short distance below the surface. Leaks from nearby lines often come to the surface through lateral transfer to a e bed, or to a slope leading down to the surface of the water. These leak areas and the warm plume of liquid joining and the body of water are visible in the thermal infrared spectrum due to the difference in temperatures of the two liquids. Late g are well suited to this type of inspection because of the cooler water temperatures (ground and surface waters) and view by foliage is minimized. Ground water seeps and outfalls of all types are also easily distinguishable for similar

25 IR image of a storm drain outfall (expanded view shown on next page)

26 IR image of a storm drain outfall

27 IR image of a storm drain outfall in are trademarked and copyrighted ( ). All data, images or any other documentation is the exclusive property of Stockton Infrared Thermographic Services, Inc. (SITS). The ic Services, Inc., SITS, and other trade names, trademarks, service marks, logos and other commercial symbols (collectively the Marks ) are hereby protected. All content, images, ecifications, standards, procedures, software or other technology, whether patented, licensed, or designated by SITS, are and shall be the sole property of SITS. User shall have no right press written consent of SITS.