TThermal imaging cameras convert infrared radiation--emitted as heat--into visible images. They are as easy to use as regular cameras, many with point-and-shoot designs. They have a wide range of uses, from determining the heating efficiency of a home to locating a missing hiker, and are commonly used by security firms, police, firefighters and the military. Imaging cameras are classified in two types: calibrated and non-calibrated. Calibrated cameras take a measurement of temperature to complement the visual image. The images themselves can be difficult to interpret, especially since some interpretations are counter-intuitive. Thermographers often spend months studying the principles of heat.
Instructions
1. Remove any objects between the camera and the target or, if necessary, angle the camera's line-of-sight around the obstruction the best you can. This is especially important when you are installing a camera for security or maintenance purposes. Objects in the line of sight can lead to an inaccurate reading of heat flow or temperature of the target. For example, if you're taking a reading of a building, you should install the camera where tree branches do not obscure it.
2. Measure the heat of the object with a thermometer. If there is not a sharp enough difference (20 degrees, at least) between the interior and exterior of the object, then the reading will be inaccurate.
3. Take multiple shots of the target to get a good sense of how heat flows around or through the target. Most recently manufactured cameras have a memory stick so the images can be downloaded to a computer. Each two-dimensional snapshot records the heat flow at a given time; a series of shots will give you a prolonged view of the temperature and flow.
4. Analyze the images to determine where your home is losing heat or where your car engine is leaking gases. This is the trickiest part of the process, since you need a firm grasp of the principles of heat to understand the images. Do your research.
5. Consult a professional thermographer if you have doubts about the images. Don't begin expensive house repairs or renovations unless you are sure you are reading them correctly. Get advice from someone who is familiar with the common errors in reading thermal images.
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