Getting Started in Infrared, Images 14-23

This image was taken when the local delta-T was low. The wall framing is visible, but with little additional detail.

An image of the same wall taken under higher delta-t conditions (from a slightly different angle) reveals voids in the insulation below the top plate. A bookshelf and other furnishings are visible on the right-hand side of the image.

Sometimes it's the structure that's confusing, not the image. This late-1800s house features solid, log-cabin-like walls of stacked and spiked dimension lumber. In the absence of framing or insulation, differences in surface radiance are few and far between.

Powering up a building's hvac system can boost the delta-T enough to allow good imaging, but it can also cause uneven surface temperatures. A baseboard heating unit is responsible for the warm streaks in this grayscale image.

In this air-conditioned structure, the prominent cool area on the ceiling lies directly in the path of a supply duct.

Daylong exposure to sunlight has loaded the south-facing wall of this home with stored heat. In the image, taken soon after dark, the roofing has radiated most of its heat to the night sky.

The air-conditioned living space in the structure can clearly be distinguished from the uninsulated attic; although the image was taken after dark, the framing in both areas is visibly warmer than the fiber-cement siding, because it retains heat from the warm day.

The effect of sunlight on a wall with an eaves overhang is frequently evident from outside.

The sun's effect may also be visible on an interior wall.

The relatively warm studs in this uninsulated exterior wall are conducting less heat to the outdoors than the framing cavities between them. Note the contrast with the partition wall at left and the insulated ceiling.

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